- To effectively participate in the Asia-Pacific cross-border multi-nodal ATFM Collaboration and ensure smooth air traffic flow throughout Vietnam and the region.

- To achieve synchronous and unified implementation across participating units, promoting smooth air traffic flow in Vietnam when being Level 3 multi-nodal ATFM.

2. Scope and objects of application

This document is applicable for all stakeholders involved in the Level 3 multi- nodal ATFM (indicative measure Calculated Take-Off Time (CTOT)) for aircraft operating at Vietnamese airports, including international and domestic flights.

2.2. Applicable subjects

This procedure applies to the following entities:

- Vietnam Air Traffic Management Corporation:

+ Air Traffic Flow Management Center;

+ Northern Air Traffic Management Company (NORATS);

+ Middle Air Traffic Management Company (MIRATS);

+ Southern Air Traffic Management Company (SORATS);

+ Aeronautical Information Service Center (AIS Center);

+ Aeronautical Meteorology Center (AMC);

- Airlines:

+ Operation Control Center (Domestic Airlines);

+ Airline representative (Foreign airline);

- Enterprises supporting for flight planning procedures.

- Airports Corporation of Vietnam:

+ Airport Operation Center/Room;

- Van Don International Airport.

- Other stakeholders participate in implementing this procedure.

3. Terms and abbreviations explanation

3.1. Terms

- ATFM node: includes air navigation service providers (ANSPs), airport operators, and involved airlines.

- Multi-nodal ATFM Collaboration: Asia-Pacific cross-border multi-nodal ATFM implementation collaboration.

- Stakeholders: Air Traffic Flow Management Center, Operation Control Center, Airport Operation Center (Domestic Airlines), airline representatives (foreign airlines) in Vietnam, Flight Planning Support Enterprises, regional Air Traffic Management Companies (relevant TWRs), Aeronautical Information Service Center, Aeronautical Meteorology Center.

- Departure airport: includes international airports of ATFM nodes in the multi-nodal ATFM collaboration and relevant airports in Vietnam.

- Arrival airport: includes airports of level 3 ATFM nodes and VietNam international airports applying level 3 ATFM measures.

- ATFM Measures: ATFM measures are implemented to balance capacity and demand; and to ensure the safe, efficient and controlled flow of air traffic.

- Web-portal: The ATFMC Information web-portal allows stakeholders to access and update information during the ATFM operation process in Vietnam. This information includes: flight information, predicted demand charts for 24 hours preceding the operating time, the ATFM daily plan, forecasted weather impact information for affected airports and estimated flight operations at airports over time

3.2 Abbreviations

AAR	Airport Arrival Rate
A-CDM	Airport - Collaborative Decision Making
ADP	ATFM Daily Plan
ADR	Airport departure rate
AFTN	Aeronautical Fixed Telecommunication Network
AMHS	ATS Message Handling System
AMO	Aerodrome Meteorological Office
ANSP	Air Navigation Service Provider
APP	Approach Control Office
ARO	Air traffic services Reporting Office
ALDT	Actual Landing Time
ATOT	Actual Take-off Time
ATC	Air Traffic Control
ATS	Air Traffic Service
ATFAS	Air Traffic Flow Advisory System
ATFM	Air Traffic Flow Management
ATM	Air Traffic Management
CAAS	Civil Aviation Authority of Singapore
CDM	Collaborative Decision Making
CNL	Cancel Messages
CLDT	Calculated Landing Time
CTOT	Calculated Take-off Time
CHG	Change Messages
COP	Common Operating Procedure
DEP	Departure Messages
DLA	Delay Messages
EET	Estimated Elapse Time
EOBT	Estimated Off Block Time
ETOT	Estimated Take-off Time
ELDT	Estimated Landing Time
FIR	Flight Information Region
FPL	Flight Plan
IATA	International Air Transport Association
ICAO	International Civil Aviation Organization
MET	Aeronautical Meteorology
STT	Standard Taxi-out Time
TWR	Tower
UTC	Coordinated universal time

4. Legal basis and reference documents

4.1. Legal basis

- Vietnam Civil Aviation Law, dated June 29, 2006, and Law No. 61/2014/QH13, dated November 21, 2014, of the National Assembly amending and supplementing some articles of the Vietnam Civil Aviation Law;

- Decree 125/2015/ND-CP dated December 4, 2015 of the Government regulating details on air traffic management;

- Circular 19/2017/TT-BGTVT dated June 6, 2017 of the Minister of Transport regulating on air traffic management and assurance take effect from August 1, 2017 and Circular 32/2021/TT-BGTVT dated December 14, 2021 of the Minister of Transport amending and supplementing a number of articles of the Circular 19/2017/TT-BGTVT dated June 6, 2017 of the Minister of Transport regulating on air traffic management and assurance.

4.2. Reference material

- ICAO Annex No. 11 - Air traffic services (Version 13- July 2018, Combined Amendment No.52).

- ICAO Doc 9971 - Guidelines for Coordination of Air Traffic Flow Management, 3rd edition - 2018.

- Manual of common operating procedure (COP) of the Asia- Pacific cross-border multi-nodal ATFM Collaboration Project.

- ICAO document on Recommended framework for post- operation analysis of ATFM.

- Operation manual of ATFM Center in Bangkok – Thailand.

II. Concept of operating procedures

1. The Asia- Pacific cross-border multi-nodal ATFM Collaboration

- Through a research collaboration led by Civil Aviation Authority of Singapore (CAAS) and Airbus ProSky, with participation from AEROTHAI, Air Traffic Management Bureau of Civil Aviation Administration of China (CAAC ATMB), Department of Civil Aviation Malaysia (DCAM), and Hong Kong Civil Aviation Department (HKCAD) and other relevant stakeholders, the Distributed Multi-Nodal ATFM Network concept was conceived to address the growing air traffic demands in the Asia-Pacific region. The initiative was renamed the Asia-Pacific Cross-Border Multi-Nodal ATFM Collaboration (AMNAC).

- The procedure is implemented on the basis of managing and achieving the balance between operational demand and capacity through adjustment in aircraft "Calculated Landing Time" (CLDT) at the arrival airport and thereby determining the “Calculated Take-Off Time” (CTOT) distributed to aircraft prior to departure.

2. Distributed Multi-Nodal ATFM Network Participation Level

Participation Level	Expected Capabilities
Level-3 ATFM Nodes	- Able to generate, deliver, and receive ATFM measures; - Able to comply with ATFM measures from all Level-3 ATFM Nodes
Level-2 ATFM Nodes	- Able to comply with ATFM measures from all Level-3 ATFM Nodes
Level-1 ATFM Nodes	- Observe and participate in the trial progress

(See Appendix 1: AMNAC Participation List.)

3. ATFM Terminilogies

3.1. General ATFM terminologies

Acronym	Term	Definition
AAR	Airport arrival rate	The arrival capacity of an airport normally expressed in movements per hour.
ADR	Airport departure rate	The departure capacity of an airport normally expressed in movements per hour.
CDM	Collaborative Decision Making	A process is applied to support operations effectively at the airport and on the ATS routes and ensure the demand-capacity balance during the period from strategic planning to implementation, applied at each specific time on the basis of the agreement and coordination of relevant agencies and units.
GDP	Ground delay program	An ATFM measure where aircraft are held on the ground, in order to manage capacity and demand in a specific volume of airspace or at a specific aerodrome. In the process, departure times are assigned.
GSt	Ground stop	A tactical ATFM measure taken in reaction to an unpredicted adverse situation, where select aircraft remain on the ground.
MINIT	Minutes in trail	A tactical ATFM measure expressed as the number of minutes between successive aircraft at an airspace boundary point.
MIT	Miles in trail	A tactical ATFM measure expressed as the number of miles between successive aircraft at an airspace boundary point.

3.2. ATFM terminologies for Flight Event Time

Acronym	Term	Definition
SOBT	Scheduled off-block time	The time that an aircraft is scheduled to depart from its parking position according to the previously arranged plan.
EOBT	Estimated off-block time	The estimated time at which an aircraft will begin moving to departure; usually matches SOBT at the airport with the Strategic Location Coordination Process.
COBT	Calculated off-block time	The time is calculated and provided by an ATFM unit as a result of the tactical slot allocation, at which a flight is scheduled to push back/vacate the parking position to comply with CTOT, taking into account start-up and taxi time.
TOBT	Target Off Block time	At the target time, the aircraft begins to move away from its parking position.
AOBT	Actual off-block time	The actual time the aircraft is pushed back/leaves the parking position.
CTOT	Calculated take-off time	The time is calculated and provided by an ATFM unit as a result of the tactical slot allocation, from which the flight is scheduled to depart from the runway.
ETOT	Estimated take-off time	The estimated take-off time taking into account EOBT plus estimated taxi-out time.
ATOT	Actual take-off time	The time that an aircraft takes off from the runway.
TSAT	Target Startup Approval	The target startup approval time.
ETO	Estimated time over	The estimated time at which an aircraft will fly over a fix, a waypoint or a specific location where the congestion can appear.
CTO	Calculated time over	The time is calculated and issued by an ATFM unit as a result of tactical slot allocation, at which a flight is expected to be over a fix, a waypoint or a specific location where the congestion can appear.
CLDT	Calculated landing time	The estimated time calculated and issued by an ATFM unit, as a result of the tactical slot allocation at which a flight is expected to land on a runway.
ELDT	Estimated landing time	The estimated time that an aircraft will touch down on the runway.
ALDT	Actual landing time	The actual time that an aircraft lands on a runway.
SIBT	Scheduled in-block time	The in-block time of an aircraft is based on the flight permission issued by the CAAV.
AIBT	Actual in-block time	The actual time that the aircraft taxis to the parking bay and stops at the parking position.

3.3. Flight Event Time Terminology mapped to specific flight event time and status

Flight Event Times	Scheduled	Flight Plan	ATFM Estimate	ATFM Meassure	Actual
Off- block time (OBT)	SOBT	EOBT	-	COBT	AOBT
Take- off time (TOT)	-	-	ETOT	CTOT	ATOT
Time over (TO)	-	-	ETO	CTO	ATO
Landing time (LDT)	-	-	ELDT	CLDT	ALDT
In- block time (IBT)	SIBT	-	-	-	AIBT

4. General information about Air Traffic Flow Management Center

- Telephone/ Fax: (+84) 24 32127893

(+84) 2438271513 ext 8643

- Email: atfmu@vatm.vn

- AFTN/ AMHS: VVVVZDZX

- Web Portal: https://www.atfm.vn/atfmportal, https://ctot.atfm.vn

- Web conference help desk: (+84) 24 32127893

- Hours of operation: 24/24.

5. ATFMC Scope of Operations

- Oversee, implement, and supervise ATFM measures within the designated airspace.

- Develop and distribute a strategic ATFM plan and daily plan (ADP) in collaboration with relevant agencies and units, using the Collaborative Decision Making (CDM) process.

- Collect and analyze relevant data affecting ATFM, including:

- Weather conditions
- Capacity limitations (e.g., airspace restrictions, infrastructure limitations)
- Runway, taxiway, and apron closures
- Air Traffic Management (ATM) system outages
- Procedural changes impacting ATM facilities

- Analyze and distribute this information to stakeholders.

- Develop and maintain procedures for exchanging and disseminating information on the ATFM website.

- Coordinate with stakeholders to forecast airspace and airport capacity. This analysis helps assess imbalances between air traffic demand and the throughput capacity of airports and airspace.

- Facilitate communication and collaboration between CDM and ATFM members.

- Monitor ATFM operations and conduct post-operational analysis and assessment to identify areas for improvement.

6. Level 3 Multi-Nodal ATFM Participants in Viet Nam

Units	Departments
Air Traffic Flow Management Center	ATFM Shift
Airport Operation Center	Planning Coordination Department
Operation Control Center (Domestic Airlines)	Head of duty, dispatcher, flight crew
Airline representative (Foreign airline)	Airline representative, flight crew
Enterprises supporting for flight planning procedures	Department/ Staff supporting for flight planning procedures
Northern Air Traffic Management Company (relevant TWR)	ATS Shift
Middle Air Traffic Management Company (relevant TWR)	ATS Shift
Southern Air Traffic Management Company (relevant TWR)	ATS Shift
Aeronautical Information Service Center	Shift – ARO Facility/ Position
Aeronautical Meteorology Center	Shift – MET Facility

7. Stakeholder’s Responsibilities

7.1. ATFMC

Responsibilities	Descriptions
General ATFM Responsibilities
Demand-Capacity Prediction and Monitoring	Coordinate with flight licensing agencies, airlines, airports and relevant agencies and units to determine the air traffic demand of aircraft operators and airspace users; Coordinate to forecast the capacities of airspace and airports; Assess the demand-capacity imbalance; Monitor the accuracy of demand and capacity predictions.
Local CDM Conference	Host scheduled local CDM conference to prepare ATFM measures.
Cross-Border CDM Conference	Host or participate in a cross-border CDM conference with other nodes .
ATFM Daily Plan (ADP)	Generate and distribute ADP to outline ATM situation for the day.
ATFM Measure Execution	Ensure the effective implementation / revision / cancellation of ATFM measures in collaboration with ATS units; Provide information on ATFM in a timely manner to stakeholders.
ATFM Measure Effectiveness Monitoring	Monitor the effectiveness of ATFM measures and adjust ATFM measures if necessary.
Post-Ops Analysis	Presiding over synthesis, analysis, and post-operation analysis.
Responsibilities Specific to GDP
CTOT Distribution	Generate CTOTs and distribute via communication channel no less than 90 minutes before Estimated Off-Block Time (EOBT) to support stakeholder’s advance planning.
CTOT Management	CTOT management (change, swap, cancel, add).
Adherence to CTOT in departure management	Manage departure traffic in adherence to CTOT within the CTOT compliance window.

7.2 NORATS, SORATS, MIRATS

Responsibilities	Descriptions
General ATFM Responsibilities
Determining the acceptance capacity	Lead the process determining the airspace and airport capacity. Report the situations affecting the airport capacity to ATFMC.
Local CDM Conference	Participate actively in local CDM conference (via telephone/email) to gain situational awareness of applied ATFM measures.
Post-Ops Analysis	Provide feedback and information on ATFM operation during Post-Ops analysis.
Responsibilities Specific to GDP
Adherence to CTOT in departure management	Manage departure traffic to meet CTOT within the compliance window.

7.3 Aeronautical Information Service Center

Responsibilities	Descriptions
General ATFM Responsibilities
Flight plan management (FPL)	Transmit FPL at least 3 hours before EOBT; Send CHG/DLA messages to relevant point of contacts immediately after receiving information (do not send a EOBT revision message according to CTOT); Send CNL and DEP messages according to applicable regulations; Provide feedback regarding any difficulties encountered during draft FPL submission and send information for transmitting ATS messages of the airlines or if required.
Local CDM Conference	Actively participate in local CDM conference (via telephone/email) to gain situational awareness of implemented ATFM measures.

7.4. Aeronautical Meteorological Center

Responsibilities	Descriptions
General ATFM Responsibilities
Providing the meteorological information	Regularly update and provide meteorological forecast information for Noi Bai, Da Nang, Tan Son Nhat airports; Notify the ATFMC when the weather forecast indicate the start or end of the adverse weather conditions that could impact operations; Promptly notify the ATFMC upon observing adverse weather conditions affecting operations at Noi Bai, Da Nang, Tan Son Nhat airports.
Evaluating the possibility of influence	Assess the potential impact of adverse weather conditions on flight operations.
Local CDM Conference	Actively participate in local CDM conference (via phones or email) to gain situational awareness of implemented ATFM measures.

7.5. Airports Corporation of Vietnam - Airport operations center/room;

Responsibilities	Descriptions
General ATFM Responsibilities
Providing the updated flight information	Provide the updated flight information to ATFMC to facilitate accurate demand prediction.
Provide information about airport capacity limitations	Notify the ATFMC of any events impacting airport capacity.
Local CDM Conference	Actively participate in local CDM conference (via phones or email) to gain situational awareness of implemented ATFM measures.
Receiving the ATFM information	Ensure timely receipt the ATFM information from the ATFMC.
Post-Ops Analysis	Participate in coordinating the post-operation analysis at the airport and provide the relevant data for the analysis.
A-CDM Linkage	When implementing the A-CDM plan, collaborate with VATM to ensure seamless integration, connection, and data exchange between ATFM – A-CDM systems. Supervise the process of updating airline TOBT based on CTOT information (applicable if ACV is implementing A-CDM).

7.6. Airlines

Responsibilities	Descriptions
General ATFM Responsibilities
Flight schedule information	Where possible, advise ATFMU of changes to schedules prior to submission of FPL.
Special Circumstance Information	Where applicable, advise ATFMU of special or extenuating circumstances that would impact the ability to comply with ATFM measures.
Flight plan management (FPL)	Ensure timely submission of FPLs (at least 03 hours 30 before EOBT). Upon flight cancellation approval, transmit a Cancellation (CNL) message to the ATFMC, indicating the flight will not operate.
DLA/CHG messages	Submit DLA or CHG messages for delay of more than 15 minutes (Do not update EOBT as a result of ATFM measure).
Cross-Border/ Local CDM Conference	Actively participate in local /Cross-border CDM conference provide input on ATFM measures
Monitoring ATFM alerts and receive the ATFM measure information	Monitor ATFM Daily Plan (ADP) for ATFM alerts and receive ATFM information for operational planning.
Critical Operational Concerns	Highlight significant operational concerns during CDM conference.
Post-Ops Analysis	Provide feedback and information on ATFM operations in the Post-Ops Analysis effort
Responsibilities Specific to GDP
CTOT compliance management	Plan affected flights that they will be get ready to start-up/ push back at appropriate time to comply with CTOT. Update the flight's TOBT to the A-CDM Portal system based on the CTOT information provided (for flights departing from Vietnam airports applicable if ACV is implementing A-CDM)
Slot revision/ Substitution Management	Request or implement the CTOT revision when the flights are unable to comply with assigned CTOT.

8. Exemption of Flights from ATFM Measure(s)

- Flights experiencing an emergency, including aircraft subjected to unlawful interference;

- Flights in search and rescue or firefighting missions;

- Urgent medical evacuation flights specifically declared by medical authorities where flight delays would put the life of patients at risk;

- Flights with “Head of State” status; and

- Other flights specifically identified by appropriate authorities.

Notes:

In case of urgent medical evacuation flights, the airline/airline representative is responsible for directly notifying ATFMC and taking responsibility for the accuracy of the information. The content of the notice should include: "The aircraft is carrying a patient who needs emergency treatment”.

9. Brief GDP Procedure

EOBT-3 hours and 30 minutes
Airlines	Submit FPL at least 3 hours 30 minutes before EOBT
ATFMC	Monitor the traffic demand and ATM capacitiy
EOBT -90 minutes
ATFMC	Generate and distribute CTOT Prepare for coordination of changes
Airlines	Check for CTOT via email / AFTN / web portal Communicate to the relevant personnel Contact ATFMC for changes to the flight Update TOBT on A-CDM Portal system based on CTOT information (for ACV applying A-CDM).
ARO	Send FPL
ATC	Check and receive CTOT via email/ AFTN/ AMHS/ Web Portal
Departure
Airlines	Ensure the flight to comply with CTOT Request a clearance Contact ATC to request to push back/start-up after receiving the enroute clearance unless otherwise notified by ATC. Contact ATFMC if there are any changes
ATC	Transfer CTOT information to the flight crew when issuing the enroute clearance Support departure as assigned CTOT.
ATFMC	Monitor the flight progress Prepare for coordination of CTOT changes
CTOT change process
Airlines	Coordinate with ATFMC for CTOT change request while the aircraft is still at the parking bay. Operation Control Center/ Airline representative contacts ATFMC for coordination. CTOT revision request should be lodged not less than 30 minutes before the assigned CTOT.
ATS Units	Coordinate CTOT changes on behalf of the airlines after the aircraft has pushed back if necessary; otherwise allow the aircraft to continue the normal procedure and inform ATFMC of non-compliance.
ATFMC	Facilitate and coordinate CTOT change requests. Ensure all stakeholders are updated.

10. Conditions for applying ATFM level 3

10.1. Human

- VATM: Ensure ATFM staff, meteorological staff, ARO staff, air traffic controllers and other relevant personnel participating in the ATFM procedure are familiar with and understand the functions and tasks of each unit involved.

- ACV, Airlines, Flight Planning Support Entities: Ensure their personnel understand the ATFM operational concept and prepare plan for flight departure adhering to the assigned CTOT, and coordinate with ATFMC for CTOT management.

10.2. Equipment system

Required equipment system requirements for participating parties:

Units	Equipment system
ATFMC	CTOT calculation tool (ATFM system) AFTN/AMHS terminal Phone Email FAX Computer with internet connection Web Portal system
Operations Control Center (Domestic Airlines); Airline representative (Foreign airline);	AFTN/AMHS terminal Phone Email FAX Computer with internet connection
Regional Air Traffic Management Companies
ARO/AIS Facilities
Airport Operations Center
AMC	AFTN/AMHS terminal Phone Email Computer with internet connection Database (Website)

11. GDP operation procedure

11.1. Principles of determining and managing CTOT

- ATFMC analyzes the demand for flight operations at level 3 airports and determine the calculated landing time arrangement and make adjustment according to the acceptance capacity of the airport. Based on this analysis, the ATFMC determines Calculated take-off time (CTOT) for flights to minimize the demand - capacity imbalance and to reduce the holding time of flights.

- CTOT is calculated and managed based on the adjustment of the estimated take-off time, the number of aircraft planned to take off within a specific timeframe at the airports, to ensure that the number of arriving flights at level 3 airports doesn't exceed the limitations of runway capacity and air traffic services within the forecasted timeframe. This prevents demand exceeding capacity and causing delays.

- During the CTOT calculation and management process, the following flights departing and taking off within the scheduled time frame will be prioritized:

+ Flights that have submitted draft flight plans (FPLs) and final FPLs according to regulations and are adhering to the planned FPL.

+ Flights that have submitted a draft FPL and have an Estimated Off-Block Time (EOBT) close to the time ATFM measures are implemented.

11.2. CTOT Calculation Methodology by the Air Traffic Flow Advisory System (ATFAS)

Air Traffic Flow Advisory System (ATFAS) is the software developed by AEROTHAI as the ATFM support tool, and is capable of calculating, distributing, and managing CTOTs. Vital to ATFAS’ calculation of CTOTs is flight plan information – speed, flight levels, routing, and EETs – that accurately reflects the flight crew’s operational intentions. The basic CTOT calculation methodology is shown below;

a) Calculate Estimated Take-Off Time (ETOT) based on Estimated Off-Block Time (EOBT) from FPL and the Standard Taxi-out Time

ETOT = EOBT + STT

b) Calculate Estimated Landing Time (ELDT) based on aircraft speed, flight levels, routes, and Estimated Elapse Time (EET) from FPL and ETOT

ELDT = ETOT + EET

c) Re-arrange and sort ELDT for each flight to meet capacity requirement at the destination airport. The re-arranged ELDT will became Calculated Landing Time (CLDT)

d) Calculate CTOT based on CLDT

CTOT = CLDT – EET

11.3. Submit FPL and send ATS messages

Stakeholders shall submit the draft FPL and send ATS messages (DLA, CHG, CNL, DEP) according to the following regulations:

Step 1: Submit draft FPL and CHG/DLA/CNL information

- Operations Control Center (Domestic Airlines); airline representative (Foreign Airlines); Flight Planning Support Enterprises.

+ Make sure to submit the draft FPL to related ARO facilities before 03 hour 30 before EOBT (except for operational or technical reasons);

+ Submit CHG/DLA When the Estimated Off-Block Time (EOBT) deviates from the originally filed flight plan by 15 minutes or more and CNL message for flight cancellation to relevant AROs facilities.

Step 2: Send FPL message and ATS messages

- ARO facility:

+ Send FPL at least 03 hours before EOBT;

+ Promptly transmit CHG/DLA messages to relevant parties upon receiving CHG/DLA information from airlines (do not send a EOBT revision message as the result of CTOT);

+ Send CNL message immediately upon receiving flight cancellation information from airlines;

+ Send DEP message according to applicable regulations.

11.4. Participate in online conferences (CDM Web Conference)

- For cross-border conference: ATFMC will participate in the online CDM conference with ATFM Level 3 countries in the region via Zoom twice a week at 0800 UTC, to coordinate and update Vietnam ATM/ATFM information.

- For local conference: ATFMC will host recurring online local CDM conferences with stakeholders every Thursday at 02:00 UTC. ATFMC may convene additional ad-hoc online local CDM conferences under exceptional circumstances that significantly impact airport capacity that may include adverse weather conditions and unforeseen events affecting airport capacity. n scenarios where anticipated demand exceeds available airport capacity, the ATFMC will implement the following ATFM measures: Calculate CTOTs for affected flights; Distribute the calculated CTOT information to relevant stakeholders; Regulate flight operations for impacted flights to optimize traffic flow and minimize delays.

11.5. Determining potential impact on operational capacity

a) Impact due to the adverse weather conditions

- Participants: Aeronautical Meteorology Center (relevant AMC); APP/TWR Facilities; Airport representative; Airport Authority at Noi Bai/Tan Son airport Nhat/Da Nang and ATFMC.

- Responsibilities of Aeronautical Meteorology Center:

+ Provide and regularly update meteorological the forecast information for the affected airport areas of Noi Bai and Tan Son Nhat.

+ Assess the potential impact of adverse weather conditions on flight operations, specifically: Forecasting weather conditions at the airport area that is likely to fall below minimum operating standards or forecasting CB clouds and moderate or strong thunderstorms (TSRA/+TSRA), strong rain/showers rain (+RA/+SHRA), wind gusts exceeding 25knots at the airport area.

+ Notify ATFMC when the adverse weather forecast is expected to affect flight operations.

+ Notification Lead Time: At least 03 hours before the expected time of adverse weather conditions.

+ In case of sudden occurrence of adverse weather, Noi Bai and Tan Son Nhat AMC should immediately notify ATFMC to initiate an online CDM conference with stakeholders.

+ APP/TWR facilities at the affected airports: Base on the AMC report and observed flight operations, propose and agree with relevant agencies and units on adjusting the limited capacity index of the runway and air traffic services within the forecast time window of the adverse weather conditions equal to 60% of the limited capacity index of the declared runway capacity and air traffic services.

b) Impact due to other factors on the level 3 airport capacity;

In situations where other factors (e.g., reduced capacity of equipment systems, airport infrastructure limitations, or military activities in the area) are expected to impact the declared capacity of a Level 3 airport, the APP/TWR facility at the affected airport will assess and evaluate the impact on the declared capacity, notify the Vietnam ATFM Shift to convene a CDM conference to reach agreement with stakeholders on the application of the adjusted capacity in real-time.

11.6. CTOT dissemination and compliance

a) Procedure for CTOT delivery and receipt

Step 1: The announcement of the intention to apply ATFM measures (CTOT)

- ATFMC will announce the plan to implement ATFM measures (CTOT) through the release of ADP which will be distributed via email to stakeholders one day before the operational day, with a revised version issued on the day of operations if necessary. ADP will provide brief information on planned ATFM measures for the upcoming 24 hour period, including information on areas with a demand-capacity imbalance and ATFM measures that are applied to resolve the imbalance, and other related information. Normally, ADP is distributed one day before operations, with a revised version issued on the day of operations when necessary.

Information released in ADP includes the following:

- Limitations and Impacts: Provides information about ATM resources with demand-capacity imbalances.

- ATFM measures: provide information about ATFM measures applied to address the imbalance noted in the Limitations and Impacts section.

Related contents: provide information about possible situations affecting the operations of the air traffic controller or ATM capacity. This information is provided for situational awareness purposes.

In order to facilitate automated ADP processing, ADP is to be sent as a file attached to an email with the following specifications:

a) E-Mail Subject: ADP_[FIR Name]_[Effective Date, yyyyymmdd]_[Version number]

b) File Name: ADP_[FIR Name]_Effective Date, yyyymmdd]_[Version number]

Example: ADP_VTBB_20181207_1

(See in Appendix 2: ATFM Daily Plan (ADP) Template and Appendix 3: ATFM Alerts / Notification Message Templates.)

Step 2: Organization of online CDM conference

- ATFMC will host an online CDM conference to clearly communicate information regarding the planned ATFM measures, discuss the details of the ATFM measures, maintain open communication channels with stakeholders throughout the ATFM implementation process.

- Stakeholders who participate in the online CDM conference in Vietnam include ATFMC and/or related AMCs, APP/TWR Facilities, representatives of ACV, and the Airport Authority. In cases where stakeholders are unable to participate in a specific online CDM conference, the VATMC will ensure they receive the conference outcomes.

Step 3: CTOT Generation and Dissemination

- CTOTs will be disseminated to stakeholders by ATFMC through various channels at least 90 minutes before the Estimated Off-Block Time (EOBT) of the associated flights. These channels may include web portal, AFTN/AMHS, telephone, or email.

Step 4: CTOT Receipt

Upon receiving a CTOT, stakeholders shall take the following responsibilities:

- The airline is responsible for confirming receipt of the CTOT to the ATFMC informing the flight crew of their assigned CTOT to ensure flight planning and preparation are aligned with the ATFM measure.

- The Airport Operation Center will acknowledge receipt of the CTOT to the ATFMC, adjust the parking location plan as necessary to optimize gate utilization and facilitate timely departures based on the assigned CTOTs, monitor pushback time, and supervise the EOBT update by airlines based on CTOT information (for ACV applying A-CDM).

- The Airport Operation Center should be aware that CTOT implementation may cause deviations from originally planned landing times and in-block times for flights. These changes may cause adjustments to the assigned parking positions to ensure efficient ground handling operations.

- Within 60 minutes of issuing CTOT, the ATFMC will confirm the information and disseminate it to the relevant Tower (TWR) facilities via telephone/AFTN (AMHS).

- Departure/arrival airport TWR facilities will receive and acknowledge receipt of the CTOT information from the ATFMC.

Note: Due to occasional communication issues, system outages, or last-minute CTOT modifications, some CTOTs may be distributed in less than 90 minutes compared to EOBT. In such cases, CTOT compliance is not mandatory. However, airlines are strongly encouraged to make every effort to adhere to the assigned CTOT whenever possible. This cooperation helps to optimize overall network performance and maximize the effectiveness of Air Traffic Flow Management (ATFM) measures.

(Refer to Appendix 4: ATFM terminology used in GDP coordination and The ATFM terminology used in voice communications; Appendix 5: CTOT delivery and receipt procedure)

b) CTOT Compliance Procedure:

Step 1: Determining CTOT compliance

- ATFMC is the focal point for ensuring communication among stakeholders; hosting CDM conferences among domestic participants via telephone/email using telephone or email to discuss and coordinate CTOT dissemination and compliance.

- Upon receiving a CTOT, stakeholders will assess their ability to comply. They will then notify the ATFMC of their compliance status (compliant or non-compliant) via telephone or email.

Step 2: CTOT Compliance

- Upon receiving a CTOT, the airline will disseminate the assigned CTOT internally. Flight crews will request en-route clearances and pushback/start-up approvals, taking into account the taxi-out time to ensure adherence to the CTOT.

- Upon receiving a CTOT, the relevant Airport Operation Center will proactively manage parking positions and gate allocations to optimize conditions for CTOT compliance.

- Upon receiving a CTOT, the arrival airport TWR will pay attention to the flights with CTOTs, and strategically manage traffic to minimize delays for the departing flight.

- The departure airport TWR, proactively arranges the departure sequence to support the flight's adherence to the CTOT.

(Refer to Appendix 6: CTOT compliance procedure)

Step 3 CTOT Non-Compliance

- Upon receiving a CTOT, if anticipating non-compliance with the CTOT, stakeholders are responsible for promptly notifying the ATFMC of the reason(s). Upon receiving a CTOT revision request, the ATFMC will evaluate the situation, predicts demands, and host CDM conference with stakeholders; recommend a new CTOT and notify stakeholders at least 30 minutes before this new CTOT.

- Prior to engine start-up, if the flight crew anticipates non-compliance with the CTOT, they will notify the airline and request a CTOT change. The airline will then inform the ATFMC about the situation where the aircraft cannot comply with the CTOT, and making requests to change the CTOT (if possible).

- In case the aircraft has started up and taxied but cannot comply with CTOT due to operation, technique, weather, etc. The related TWR must notify the ATFMC immediately. ATFMC makes changes to CTOT (if possible) or the related TWR handling according to actual situations (the aircraft not complying with CTOT may have to hold when landing at the arrival airport).

(Refer to Appendix 7: Procedure of changing CTOT request).

Note: Due to the nature of a distributed ATFM network in Asia-Pacific, several concurrent GDPs may be activated, and a particular flight may be subjected to more than 1 CTOT. Should a problem of conflicting or concurrent CTOTs occur, stakeholders are to contact ATFMC for assistance. In this case, ATFMC will assist in resolving the conflicting requirements through coordination with other ATFM facilities in the region.

11.7. Revision/cancellation of CTOT

Step 1: Determine the capability to revise/cancel CTOT

- ATFMC updates changes based on the actual operation situation to reassess demand and capacity. There is a CTOT revision/ cancellation if CTOT is no longer suitable.

Step 2: Revise/cancel CTOT

- Revisions and cancellations of regular CTOT will be notified by ATFMC to stakeholders 45 minutes before the revised CTOT. However, in some unusual situations, revision and cancellation of CTOT may be informed after the above time. Stakeholders will base their decisions on the actual situation to determine the possibility of compliance/non-compliance with the revised CTOT.

a) Revise CTOT

- ATFMC notifies stakeholders about the revision of CTOT on the web portal/email/ATFN/AMHS/phone.

- Stakeholders are responsible for acknowledging the revised CTOT to ATFMC.

- The Airport Operation Center receives revised the CTOT information to arrange the aircraft departure gates.

- The airlines inform the flight crew about the revised CTOT. The flight crew departing the flight must comply with CTOT.

- TWR and ARO Center issue the flight procedure according to the revised CTOT.

b) Cancel CTOT

- ATFMC informs about the cancellation of CTOT via email/telephone/ATFN/AMHS for stakeholders.

- Stakeholders confirm the receipt of information about CTOT cancellation to ATFMC.

(Refer to Appendix 8: Procedure of revising CTOT; Appendix 9: Procedure of cancelling CTOT).

11.8. CTOT Swapping

a) The CTOT swapping procedure allows the airlines to request the ATFMC rearrange their own flights to comply with ATFM measures according to the airline’s demand. CTOT swaps are issued according to the following requirements:

- Two flights apply the same measure for designating the calculated take-off time (CTOT).

- A swap within the same aircraft operator is requested from its operation control center or the person responsible for the schedule and rotation of the of the aircraft.

- A swap between two different aircraft operators, given that both operation control centers of both aircraft operators (or the person responsible for the schedule and rotation of aircraft) agree.

- A swap between two different aircraft operators was requested by an air traffic controller at the departure airport for the purpose of departure management after the pilot-in-command of both flights agreed to do so.

b) The CTOT swapping procedure is implemented as follows:

- Flight crew/airline: Refer to the web portal of ATFMC to confirm the CTOT change appropriately (CTOT swap or open slot), issue a CTOT swap request, and send it to ATFMC.

- ATFMC will base their decision on the list of flights designated as CTOTs to issue the CTOTs swapping between two flights. ATFMC distributes the CTOT revision information after determining the revised CTOT for two flights, following the steps in Appendix 8: Procedure for Revising CTOT. (Refer to Appendix 10: Procedure of CTOT swapping (between two flights); Appendix 11: CTOT swapping (to Open Slot).

11.9. CTOT information delivery methods

Alerts/ Notification about the CTOT information are distributed via the main methods as follows:

- Web portal

- E-Mail

- AFTN/ AMHS Messages include:

Slot Allocation Message (SAM)
Slot Revision Message (SRM)
Slot Cancellation Message (SLC)

Note: In case of not automatically updating the CTOT information, ATFM staff is responsible for updating CTOT manually on A-CDM Portal system (for Airport Coorporation of Vietnam applying A-CDM).

(Refer to Appendix 12: ATFM data exchange template).

11.10. CTOT compliance management

Stakeholders coordinate in order that the flight have the capability of CTOT compliance in the time window as follows:

-5 / +10 minutes for designated CTOTs in case the airport is restricted;
-5 / +5 minutes for designated CTOTs in case the airspace is restricted;

11.11. Operation of the technical equipment system

a) Operating the ATFM system

ATFMC is responsible for operating the ATFM system (if any).

b) Operating the web portal of ATFMC

Follow the operation manual provided by ATFMC when participating in operating ATFM.

c) Operating the other equipment (Email, AFTN/AMHS, telephone, database):

- Use email to receive ADP, CTOT and ATFM related notifications.

- Use the AFTN/AMHS terminal to receive FPL, other ATS messages and ATFM messages.

- Use the telephone to communicate between stakeholders when necessary.

- Use databases to provide/receive meteorological reports.

- Use the A-CDM Portal system to update the CTOT information.

The technical equipment mentioned above is applied in operating ATFM. In case one of the technical systems is damaged or affected regarding the application of ATFM measures, stakeholders notify ATFMC for implementation.

Note: In case the ATFM system fails during applying ATFM measures, ATFMC must notify stakeholders about the cancellation of the currently applied ATFM measures, stakeholders will follow the normal operational plan.

11.13. Storage of related information and messages

Data related to this procedure requires a minimum of 90 days of storage.

- ATS messages related to the implementation of the procedure;

- ATFM daily plan (ADP) and CTOT information are received, revised, and canceled for applicable flights.

III. IMPLEMENTATION ORGANIZATION

1. CAAV

- The agency that promulgates procedures, reviews and decides on implementation at each specific airport according to the route.

- Monitor, guide, and preside over coordination in handling problems and difficulties that arise during the implementation of this procedure.

2. Agencies and units:

- VATM, ACV, and the related airlines will disseminate the content of this procedure and assign and implement content and tasks within the responsibility of their own units.

- During the implementation process, ATFMC reports to the CAAV on results monthly according to the content of post-operation analysis in Section 10.5, Part II, reports difficulties and problems (if any), and proposes revisions to improve the procedure.

APPENDIXES

Appendix 1	List of ANSPs and Airports paticipating in the levels of multi- nodal project
Appendix 2	ATFM Daily Plan (ADP) Template
Appendix 3	ATFM Alerts / Notification Message Templates
Appendix 4	ATFM terminology used in GDP coordination and The ATFM terminology used in voice communications
Appendix 5	CTOT delivery and receipt procedure
Appendix 6	CTOT compliance procedure
Appendix 7	Procedure of changing CTOT request
Appendix 8	Procedure of revising CTOT
Appendix 9	Procedure of cancelling CTOT)
Appendix 10	Procedure of CTOT swapping (between two flights)
Appendix 11	CTOT swapping (to Open Slot)
Appendix 12	ATFM data exchange template
Appendix 13	Post-Operation Analysis Template

Appendix 1:

List of ANSPs and Airports paticipating in the levels of multi- nodal project

ANSP

Country

Participation Level

Participating aerodromes

AEROTHAI

Thailand

All aerodromes

Civil Aviation Authority of Singapore (CAAS)

Singapore

WSSS

Civil Aviation Authority of China, Air Traffic Management Bureau (CAAC ATMB)

China

ZGGG

ZGSZ

ZJSY

ZJHK

Cambodia Air Traffic Services (CATS)

Canpuchia

VDPP

VDSA

VDSV

Hong Kong Civil Aviation

Department (HKCAD)

Hong Kong

VHHH

VMMC

Republic of Korea

Korea

All aerodromes

Airnav Indonesia

Indonesia

WIII

WARR

WADD

Civil Aviation Authority of

Malaysia (CAAM)

Malaysia

WMKK

WMSA

WMKL

WMKP

WMKI

WMKJ

WBKK

WBGG

Civil Aviation Authority of The

Philippines (CAAP)

Philipines

RPLL

RPLC

RPVM

RPSP

Viet Nam Air Traffic

Management (VATM)

Vietnam

VVNB

VVTS

VVDN

VVCI

VVVD

VVVH

VVPB

VVCT

VVCR

VVDL

VVPQ

Department of Civil Aviation

Myanmar (DCA Myanmar) Myanmar

VYYY

VYNT

VYMD

Lao Air Navigation Services

(LANS)

Lao PDR

VLVT

VLLB

VLPS

(Có thể hỗ trợ biện pháp ATFM với tư cách nút mức 2)

Appendix 2:

ATFM Daily Plan (ADP) Template

Appendix 3:

ATFM Alerts / Notification Message Templates

Case 1: ADP Dissemination and CDM Web Conference

Subject: ADP_[FIR Name]_[Effective Date, yyyymmdd]_[Version number]

Dear All,

Please refer to the attached for:

1. ADP - Information on the declared AAR and proposed ATFM Measure

2. Meteorological Information

Due to thunderstorm with rain expected from [start time] to [end time], there is a high potential for ATFM Measure to be initiated for arrivals into [ICAO designator for airport] on [date] from [start time] to [end time]

Action required:

• ATFMUs (Level 2 & 3) please join the CROSS BORDER web conference conducted by [Node] ATFMU at [time] UTC. URL : [ web conference address]

• Airlines and Airport Operators participation in the cross border CDM web conference are OPTIONAL

No acknowledgement on the receipt of this email is required.

If you encounter any issues participating in the web conference, please email [Node] ATFMU at [Node’s ATFMU email address]

Case 2: CTOT Publication and Slot Management Web Conference

Subject: ATFM OPERATIONS – [Title of Operation] [Node] – CTOTs Publication and Slot Management Web Conference

Dear All,

ATFM Measure will be initiated for arrivals into [ICAO designator for airport] on [date] from [start time] UTC to [end time] UTC.

Calculated Take Off Time (CTOT) Information

Please refer to the following website: [ATFM CTOT information website] to view CTOT information.

Slot Management (If required)

1. Identify the flight(s) and slot you wish to swop. Example:

• Slot Swop: Flight A and Flight B

• Open Slot: Flight C and Slot “xx/xxxx”

2. Join the Slot management web conference conducted by [Node] ATFMU to request for slot change. URL :[Web conference address]

Action required:

• Login to web portal using User ID and Password which was provided to the key POCs in your organization (please check with your respective POCs)

• View CTOT information

• Acknowledge the receipt of this email through your ATFM Node leader

• If required, join Slot Management web conference

Case 3: Slot Management

Subject: ATFM OPERATIONS – [Title of Operation] [Node] – Slot Management

Dear all,

Please note that the following request for Slot Management is successful.

Slot Swop

• Flight A: Updated CTOT XXXX UTC

• Flight B: Updated CTOT XXXX UTC

Open Slot

• Flight C: Updated CTOT XXXX UTC

Please refer to the following website: [ATFM CTOT information website] to view the updated Calculated Take Off Time (CTOT) information.

Case 4: ADP Revision Dissemination

Subject: ADP_[FIR Name]_[Effective Date, yyyymmdd]_[Version number]

Dear All,

ATFM Measure implemented for arrivals into [ICAO designator for airport] on [date] from [start time] UTC to [End Time] UTC will be REVISED.

Due to change in weather conditions, the duration of the ATFM Measure will be extended till [End Time] UTC. With a further reduced AAR of xx between [start time] UTC to [End Time] UTC

Please refer to the following website: [ATFM CTOT information website] to view the revised Calculated Take Off Time (CTOT) information.

Action required:

• Login to web portal using User ID and Password which was provided to the key POCs in your organization (please check with your respective POCs)

• View revised CTOT information

Appendix 4:

ATFM terminology used in GDP coordination

Basic Phrases

Circumstances	Sample Phrases
GDP Activation Announcement (e.g. for CDM conference)	GDP WILL BE ACTIVATED FOR <location> DUE TO <reason>. CTOT WILL BE ISSUED FOR FLIGHTS PLANNED TO ARRIVE <location> BETWEEN <time active>.
GDP CancellationAnnouncement (e.g. for CDM conference)	GDP FOR <location> HAS BEEN CANCELLED. FLIGHTS FOR <location>MAY DISREGARD CTOT AND DEPART WHEN READY.
CTOT Change Request (Requested by stakeholder)	(THIS IS <caller ID>) <aircraft ID> <adep> TO <ades> CURRENT CTOT <current CTOT> REQUEST NEW CTOT WITH ADDITIONAL <number of minutes> DELAY (or […] WITH NEW ESTIMATED TAKE-OFF<new ETOT>)
CTOTChangeResponse– Change Approved (Responded by initiating ATFMU)	<aircraft ID>CHANGE REQUEST NOTED, STANDBY NEW CTOT <aircraft ID><new CTOT> (STANDBY FOR NOTIFICATION VIA <AFTN / web / e-mail>) Advise receiver if new CTOT is manually added and no system notification will be distributed**
CTOTChangeResponse–Delay Out ofPeriod (Responded by initiating ATFMU)	<aircraft ID>CHANGE REQUEST NOTED, STANDBY FLIGHT WILL BE OUTSIDE GDP PERIOD CTOT NOT REQUIRED IF DEPART AFTER <time>
CTOT Swap Request (Requested by stakeholder)	(THIS IS <caller ID>) REQUEST SLOT SWAP BETWEEN <aircraft ID1><adep>TO<ades>AND <aircraft ID 2><adep>TO<ades>
CTOT Swap Request Response (Responded by initiating ATFMU)	<aircraft ID 1>SWAP REQUEST NOTED, STANDBY SWAP REQUEST APPROVED NEW CTOT <aircraft ID1> <new CTOT 1>NEW CTOT <aircraft ID2> <new CTOT2> (STANDBY FOR NOTIFICATION VIA <AFTN / web / e-mail>)
Circumstances	Sample Phrases
	(THIS IS <name>ATFMU)
CTOT Cancellation	CTOT <aircraft ID>CANCELLED
(for a particular flight)	FLIGHT MAY DEPART WHEN READY
	(STANDBY FOR NOTIFICATION VIA <AFTN /web/e-mail>)

EXCHANGE TEMPLATES

Situation 1:

A GDP has been activated for flights transiting Sanya FIR by Sanya ATFMU. Bangkok ATFMU coordinates for a slot change for THA622 with Sanya ATFMU due to minor technical issue at the aircraft.

Sanya ATFMU: Sanya ATFMU

Bangkok ATFMU: This is Bangkok ATFMU.

THA622 Bangkok

to Kansai Current

CTOT 1641

Request new CTOT additional 15 minutes delay

Sanya ATFMU: THA622 change request noted; stand by

Sanya ATFMU: THA622 new CTOT 1700

Stand by for notification via AFTN

Bangkok ATFMU: THA622 new CTOT 1700.

Situation 2

A GDP has been activated for flights landing HongKong International Airport (VHHH) by HongKong ATFMU. Singapore ATFMU coordinates with HongKong ATFMU for a slot change for SIA860.

The flight will be delayed out of constrained period, and is advised to disregard CTOT if departing after a time.

HongKong ATFMU: Hong Kong ATFMU

Singapore ATFMU: This is Singapore ATFMU

SIA860 Singapore to Hong Kong

Current CTOT 0110

Request new CTOT additional 20 minutes delay

HongKong ATFMU: SIA860 change request noted; stand by

HongKong ATFMU: SIA860 flight will be outside GDP period

CTOT not required if depart after 0130

Singapore ATFMU: SIA860 CTOT not required if depart after 0130

Bangkok ATFMU: Bangkok

Situation 3

A GDP has been activated for flights landing Bangkok DonMueang Airport (VTBD) by Bangkok ATFMU. ThaiAirAsia coordinates with Bangkok ATFMU to swap the landing slots between AIQ312 and AXM882.

ATFMU ThaiAirAsia: This is AirAsia

Request slot swap between

AIQ3002 Phuket to Bangkok and

AIQ3117 Hat Yai to Bangkok

Bangkok ATFMU: AIQ3002 AIQ3117 swap request noted; standby

Bangkok ATFMU: Swap request approved

AIQ3002 new CTOT 0258

AIQ3117 new CTOT 0250

Standby for notification via AFTN, e-mail, and on webpage

ThaiAirAsia: AIQ3002 new CTOT 0258 AIQ3117 new CTOT 0250

The ATFM terminology used in voice communications

Circumstance	Phraseology
Calculated Take-Off Time (CTOT) delivery resulting from a slot allocation. The CTOT shall be communicated to the pilot on first contact with ATC.	CTOT (time)
Change to CTOT resulting from a slot revision.	REVISED CTOT (time)
CTOT cancellation resulting from a slot cancellation.	CTOT CANCELLED, REPORT READY
Start-up requested too late to comply with the given CTOT.	CTOT EXPIRED, REQUEST A NEW CTOT
Denial of start-up when requested too late to comply with the given CTOT. (Where supported by State regulation or procedure)	UNABLE TO APPROVE START-UP CLEARANCE DUE CTOT EXPIRED, REQUEST A NEW CTOT
Start-up requested too early to comply with the given CTOT.	REQUEST A NEW CTOT
Denial of start-up when requested too early to comply with the given CTOT. (Where supported by State regulation or procedure)	UNABLE TO APPROVE START-UP CLEARANCE DUE CTOT (time), REQUEST START-UP AT (time)

Appendix 5:

CTOT delivery and receipt procedure (1/2)

Appendix 6:

CTOT compliance procedure

Appendix 7:

Procedure of changing CTOT request

Appendix 8:

Procedure of revising CTOT

Appendix 9:

Procedure of cancelling CTOT

Appendix 10:

Procedure of CTOT swapping (between two flights)

Appendix 11:

SLOT swapping (become open SLOT)

Appendix 12:

ATFM data exchange template

Message	Originator and Description	Action
Slot Allocation Message (SAM)
- TITLE SAM - ARCID ABC123 - ADEP WSSS - ADES VTBD - EOBD 191002 - EOBT 0925 - CTOT 1037 - REGUL VTBD02OCTM - COMMENT DUE TO AIR DISPLAY - TAXITIME 0010 - REGCAUSE GA 83	SAM: Slot Allocation Message Sent to AU/ATC 2 Hours before last received EOBT. The SAM is used to inform AUs & ATS of the Calculated Take-Off Time (CTOT) computed by ATFM system for an individual flight, to which AUs/ATC must adhere.	Sent to AUs/ATS 2 hours before the last received EOBT. AUs/ATC must comply with the CTOT.
Slot Revision (SRM)
- TITLE SRM - ARCID ABC123 - ADEP WSSS - ADES VTBD - EOBD 191002 - EOBT 0925 - NEWCTOT 1037 - REGUL VTBD02OCTM - COMMENT DUE TO AIR DISPLAY - TAXITIME 0010 - REGCAUSE TBA	SRM : Slot Revision Message Sent to AU/ATC to pass or confirm any revision to a CTOT following the issue of the initial SAM. This message may be used to indicate a delay increase or decrease.	The SRM notifies a significant change of slot. AUs/ATC must comply with the NEWCTOT.
Slot Cancellation (SLC)
- TITLE SLC - ARCID ABC123 - ADEP WSSS - ADES VTBD - EOBD 191002 - EOBT 0925 - TAXITIME 0010	SLC : Slot Requirement Cancellation Message Sent to AU/ATC to advise that a flight, which has received a CTOT, is no longer subject to a restriction.	Flight may depart without CTOT unless a new CTOT message is received later or other restriction has been given.

Fields	Definition
ADEP	ICAO indicator of aerodrome of departure
ADES	ICAO indicator of aerodrome of destination
CTOT	Calculated Take-Off Time
EOBD	Estimated Off-Block Date.
EOBT	Estimated Off-Block Time
NEWCTOT	Revised CTOT
NEWEOBT	Revised EOBT
REGUL	Identifier for the restriction imposed
COMMENT	Commentary
TAXITIME	Taxi Time
REGCAUSE	Regulation Cause

In which the following terms are used:

Slot Allocation Message (SAM) is sent to stakeholders when the aircraft flies restricted for at least 90 minutes before EOBT. SAM message informs stakeholders CTOT for each flight. CTOT is defined as the take-off time.

SLOT Revision Message (SRM) is sent to stakeholders for informing CTOT revision compared to the original SAM. The SRM message is the result of CTOT manager.

SLOT Cancellation Message (SLC) is sent to stakeholders to inform that the flight receving CTOT no longer applies the flow restrictions. SLC message sent does not mean that the flight is not subject to further compliance any other limitations. If after receiving the SLC message, new applied controls will affect the flight, stakeholders will receive a new SAM message. If control is no longer applied/flight operations returning to normal will be recorded in the REMARK section of the SLC message.

REGCAUSE field: In order to provide more specific nomenclature for delay causes and, at the same time, to assist the postflight analysis, REGCAUSE field comprises:

a) ATFM Measure cause code (one (1)-letter code corresponding to the cause assigned by ATFMC).

b) ATFM Measure Location code -one (1)-letter code: D, E, or A, describing the phase of the flight (Departure, Enroute, and Arrival) the constraint that triggered the ATFM Measure.

c) A space.

d) The IATA Delay Code in numeric (e.g. 81, 82, 83, 89) or 00 when no IATA Code available.

REGCAUSE appears in SAM and SRM messages. The code appears in message is the code in effect at the time the flight is delayed.

The REGCAUSE table according to EUROCONTROL is as follows:

REGUL field: indicates the name of the regulation affecting the flight. Use this field for identify the regulation and for the purpose of post-operation analysis.

The name of the regulation is built with the following elements:

a) Location of the regulation (ATC sector, aerodrome, waypoint).

b) Date of the regulation.

c) Period in the day:

M = Morning (0600-1159 LT)

A = Afternoon (1200-1759 LT)

N = Night (1800-2359 LT)

E = Early morning (0000-0559 LT)

X = Other

Appendix 13:

Post-Operation Analysis Template

According to the common procedure in the Asia- Pacific cross-border multi-nodal ATFM Collaboration Project, stakeholders in Vietnam does the following:

- NORATS, MIRATS, SORATS, AIS Center, Airport Operations Center, Operations Control Center, airline representative are responsible for providing feedback on ATFM measures and the applied procedure, and sending them to ATFMC monthly.

- ATFMC synthesizes feedback from stakeholders, implements post-operation analysis and presides over conducting seminars to exchange information information and sharing experiences to improve measures and procedure.

- Post-operation analysis includes the following contents:

+ Submission of draft FPL and provision of information to transmit ATS messages of airlines;

+ The transmission of FPL and ATS messages of AIS Center;

+ Level of CTOT compliance and operation efficiency when complying with CTOT;

+ The effectiveness of other ATFM measures applied (if any);

+ Impact of CTOT and other ATFM measures (if any) on coordination, ATC and operation at airports and aerodromes;

+ Difficulties, problems and suggestions (if any).

Appendix: POST-OPERATION ANALYSIS REPORT TEMPLATE

………………………….

ĐƠN VỊ …………….

CỘNG HÒA XÃ HỘI CHỦ NGHĨA VIỆT NAM

Độc lập – Tự do – Hạnh phúc

Hà Nội, ngày….. tháng ….. năm 2021

BÁO CÁO ĐÁNH GIÁ SAU KHAI THÁC

Kính gửi: Trung tâm Quản lý luồng không lưu/Tổng công ty QLBVN

Thống kê việc nộp FPL, gửi điện văn không lưu và cập nhật COBT

Thống kê việc phát FPL và gửi điện văn không lưu

Đánh giá việc giao, nhận và tuân thủ CTOT và hiệu quả khai thác khi tuân thủ CTOT

3.1. Thời gian giao, nhận CTOT

3.2 Đánh giá tuân thủ CTOT

3.3 Tác động, hiệu quả khai thác khi tuân thủ CTOT

Tác động của CTOT và các biện pháp ATFM khác (nếu có) đối với công tác phối hợp, điều hành bay và khai thác tại cảng hàng không, sân bay

……………………………………………………………………………………………………………………………

Khó khăn/vướng mắc:

……………………………………………………………………………………………………………………………

Đề xuất/kiến nghị:

……………………………………………………………………………………………………………………………

ĐẠI DIỆN ĐƠN VỊ

Lưu ý:

Mục 1: áp dụng cho TT ĐHKT, ĐD HHK.
Mục 2: áp dụng cho các Cơ sở TTB.
Mục 3, 4: áp dụng cho TTQLLKL
Mục 4, 5, 6: áp dụng cho tất cả các bên tham gia.

Vietnam achieves level 3 participation in the Asia-Pacific Cross Border Multi Nodal ATFM Colaboration ENGLISH VERSION

3.2 Abbreviations

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