Contact

Post:

Civil Aviation Authority of Viet Nam
Air Navigation Department
119 Nguyen Son Street,
Long Bien District
Ha Noi, Viet Nam

Telephone:  +84 24 38274191

Fax:  +84 24 38274194

Email:  and@caa.gov.vn

Web:  http://caa.gov.vn

AIP Supplement for VIET NAM

AIP SUP

05/24

Effective from 01 FEB 2024

to PERM

Published on 26 JAN 2024

  OPERATIONAL PROCEDURE OF AIRPORT COLLABORATIVE DECISION MAKING (A-CDM) AT NOI BAI INTERNATIONAL AIRPORT

1 — INTRODUCTION

This section supplements the following portion(s) of the AIP: AD.

On 17 MAR 2023, AIP SUP A10/23 was published to provide information about the Airport Collaborative Decision Making (A-CDM) operational procedures of Noi Bai during phase 1.

On 21 JULY 2023, AIP SUP A27/23 was published to provide information about continuation of trial operational procedure of Airport Collaborative Decision Making (A-CDM) at Noi Nai International Airport during phase 2.

In the present, A-CDM has been familiarized and applied by Airlines, Airport Operators, ATC Unit.

This AIP Supplement aims to provide information about the Airport Collaborative Decision Making (A-CDM) of Noi Bai International Airport.

2 — DETAILS

2.1  Purpose

Airport Collaborative Decision Making (A-CDM) is a procedure agreed among units: Airport Operators, Airlines, Ground Handlings, Air Traffic Control, Air Traffic Flow Management to collaboratively make decision at the airport in order to manage the congestion at the airport, increase the efficiency for departure aircraft, optimise the use of resource at the airport, enhance the ability of predicting and implementing exactly the process of a complete flight from departure phase till arrival phase.

All civil flights operating at Noi Bai International Airport must comply to A-CDM operational procedures, except for VIP, emergency, medical, and search and rescue flights.

2.2  Applicable Time frame

Noi Bai International Airport officially implement A-CDM 24/7 for arriving and departing flight from 1701, 31st JAN 2024.

2.3  Operational Procedures

The coordination among flights is based on the principle which flights/aircrafts are best planned shall be served best (Best planned, Best served).

There are two core timestamps of A-CDM procedures: Target Off-Block Time (TOBT) and Target Startup Approval Time (TSAT), which shall be applied during operations at Noi Bai International Airport.

2.3.1  A-CDM Portal description and information update instruction for pilots

A. TOBT and TSAT displays

TOBT and TSAT are displayed on the main interface of A-CDM Portal.


TOBT and TSAT of flights are displayed on the pilot interface of A-CDM Portal.


B. Log-in to Pilot Interface of A-CDM Portal

  1. Log-in

  2. Input address https://acdm.vietnamairport.vn

  3. Click “With Email”. Input email and password to login

  4. Deselect “Use Password to login” to use login by OTP


  5. On default page:

  6. Choose NOI BAI


2.3.2  TSAT Countdown Timer for Pilots

2.3.2.1  Overview

TSAT Countdown Timer for Pilot page has the feature to view pilot-specific data fields. These fields are synchronized in real time. These fields include: Callsign, route, SOBT, EOBT, TOBT, TSAT, TTOT, CTOT, Departure Parking (DPRK).

2.3.2.2  Features of TSAT Countdown for Pilot

  1. The real-time clock that defaults to UTC. If you want to change to local time, click the "convert toggle" button next to it;

  2. Click “Please Select Flight” then choose a flight;

  3. When TOBT or TSAT of a flight is updated, FDE will blink for 15 seconds to indicate that the field has been updated.

Note: These flights are scheduled between -2 hours and +3 hours from the current time.

For Countdown Timer: after the Pilot selected a flight, one of these cases will occur:

  1. If the selected flight has TSAT, Countdown Timer will be activated and indicated in orange.


  1. Countdown Timer will turn to green when the current time is within TSAT window +/-5 minutes.


  1. Countdown Timer will turn to red when the current time passes TSAT over 5 minutes.


  1. If there is AOBT, Countdown Timer will turn to white and stops counting.


2.3.3  Definition of commonly used terms in A-CDM

  1. TSAT (Target Start-Up Approval Time): The time provided by ATC taking into account TOBT and CTOT, that an aircraft can expect to receive start-up /push-back approval (start up and push back approval are issued together).

  2. EOBT (Estimated Off-block Time): The estimated time that an aircraft will depart from its parking position.

  3. TOBT: The point in time at which the aircraft operator or ground handling estimates an aircraft to be ready: all ground handling activities are finished, the flight preparation in the cockpit has finished, all doors are closed and the boarding bridge and handling equipment removed, push back truck available and ready for immediate start and push back upon clearance from the Tower.

  4. ALDT: The actual time that an aircraft touches down on the runway.

  5. TTOT: The target time that an aircraft will become airborne from the TRWY, based on TSAT.

  6. CTOT: The calculated time for take-off. CTOT is issued by the ATFMC as a result of an ATFM slot allocation and is a constraint in the planning of a TTOT.

2.3.4  Operation Procedures

2.3.4.1  SOBT

Aircraft starts taxi out of the current stand as planned. The leaving time from stand of aircraft is issued based on seasonal flight schedule.

2.3.4.2  EOBT:

Expected time for aircraft to taxi out of the current stand.

Foreign airlines, private flights, charter flights, official duties aircraft without representatives at NIA shall authorize GH to submit flight schedule (including EOBT information) for the next day to the Noi Bai International Airport before 03:00 daily.

In operating day, EOBT will be updated by FPL or DLA messages, as detailed:

  1. Proposal FPL will be submitted by Airlines to Noi Bai ARO/AIS Center via AMHS/AFTN or AIS/AIM or email, not later than:

    1. 150 minutes before EOBT for domestic flights that submit FPL remotely.

    2. 210 minutes before EOBT for international flights that submit FPL remotely.

    3. 60 minutes before EOBT when submitting hard copy of Proposal Flight Plan to Noi Bai ARO/AIS Center.

  1. For flights that depart from airports and airspace of Level 2/ Level 3 Multi-Nodal ATFM Network to airports and airspace of Level 3 Multi-Nodal ATFM, the timing of FPL submission shall comply to the current ATFM Multi-Nodal Operational Procedures of Viet Nam.

  1. Upon receiving proposal FPL, Noi Bai ARO/AIS Center is responsible for examining, cross-checking and approving FPL then issuing the approved FPL to stakeholders via ATFN/AMHS or AIS/AIM immediately.

  2. Airlines shall notify Noi Bai ARO/AIS Center and ATFMC if new EOBT is available (for the delay from 15 minutes to less than 60 minutes compared to the initial EOBT). Except for flights departing from NoiBai International Airport to airports and airspace of Level 3 Multi-Nodal ATFM Network, ATC Flight plan submission and relevant information about generating ATS message (including DLA, CNL, CHG messages) shall comply to the current Level 2 ATFM Multi-Nodal Operational Procedures of Viet Nam. Noi Bai ARO/AIS Center promulgate DLA message as regulated.

  3. Airline shall submit a new proposal FPL and notify Noi Bai ARO/AIS Center and ATFMC if flight delays more than 60 minutes compared to old EOBT.

2.3.4.3  ALDT

ALDT is actual time aircraft touch down on RWY. This time is recorded by Radar NOVA9000 system and from ARR message (AMHS) and then send to A-CDM Portal via SMIS system.

2.3.4.4  TOBT

As soon as a flight schedule is updated into the A-CDM Portal system, the innitial TOBT shall be calculated based on the FPL information and shall be set equal to the SOBT.

Then, based on the FPL submitted by airline, the 1st TOBT will be set equal to EOBT (before the automatically calculated TOBT).

As soon as the estimated landing time of an arrival flight is defined, the 2nd TOBT will be automatically calculated following the formula: The 2nd TOBT = EIBT (ELDT + EXIT) + ETTT.

Changes of ELDT/EIBT will result in updating TOBT.

As soon as the actual landing time of an arrival flight is recorded, the 3rd TOBT will be automatically calculated following the formula: The 3rd TOBT =EIBT(ALDT+EXIT) + ETTT.

This automatic calculation process will continue until the flight is actual arrived at aircraft stand and AIBT is confirmed in the system. The 4th TOBT = AIBT + ETTT.

New TOBTs are always greater or equal to EOBT.

In case of aircraft parking overnight or aircraft swapping, TOBT will be automatically calculated based on ACGT with the formula: TOBT = ACGT + ETTT. GH is responsible for inputing ACGT when the ground-handling activities for the aircraft start as scheduled.

From this point onward, GH is mainly responsible for updating TOBT. The GH will consider available resources and their own planning as well as agreed procedures with airlines in updating TOBT for flights

Upon receiving notices of regulated CTOTs from ATFMC, AO/GH will calculate and adjust new TOBTs in accordance with provided CTOTs. According to actual traffic conditions, ATC will sequence the departure of flights within CTOT timeframes if possible.

Pilot should continue to monitor TOBT to ensure the aircraft is ready within TOBT +/- 5 minutes. If the aircraft readiness is unachievable within TOBT +/- 5 minutes, pilot shall inform GH to update TOBT.

Another source for updates of the TOBT can be the EOBT. If the flight plan EOBT is updated to a later time than the current TOBT, GH needs to update the new TOBT. The number of manual TOBT update will be limited to not more than 3 times within 30 minutes before EOBT.

2.3.4.5  TSAT

TSAT is provided basing on the TOBT, CTOT and/or ATC flow. Base on those factors, aircraft is expected to get approval for starting up engine/pushing back or taxiing.

2.3.4.6  TOTT

TTOT is the target time that an aircraft will become airborne based on TOBT/TSAT and estimated Taxi-Out Time (EXOT).

2.3.5  Start-up Procedures

Start-up procedure is based on a collaborative TSAT planning. Based on the TOBT received by ATC, DMAN system will generate a TSAT.

  1. At TSAT: +/-5 minutes, Pilots will request and receive start-up approval from the ATC.

  2. TSAT window: +/- 5 minutes from TSAT.

If start-up/push-back clearance requested by pilots is within TSAT window < 6 minutes, (TSAT + ≤ 05 minutes: 59 seconds displaying on the equipment monitor), it is still considered as within TSAT window.

If start-up clearance requested by pilots is within TSAT window, ATC is responsible for issuing start-up/push-back approval clearance if possible.

  1. For flights that require idle engine start before starting all engines for departure: Flight crew shall actively estimate the idle engine start time to ensure that the aircraft will start all engines for departure within the Target Start-Up Approval Time (TSAT) window. The flight crew should inform the ground handling (GH) personnel of this information so that they can decide if it is necessary to update the Target Off-Block Time (TOBT) of the flight (note: the idle engine start time should be added).

  2. For aircrafts that need to be pushed out before starting all engines for departure: Flight crew shall actively estimate the time to request push-back clearance from ATC. Once the push-back process is completed, the flight crew requests clearance to start all engines. This engine start time should be within the TSAT window. The purpose is to ensure the preservation of the TTOT for the flight.

If start-up/push-back clearance requested by pilots is before TSAT window, ATC shall request pilots to call again for clearance within TSAT window.

If there is no start-up/push-back clearance requested by pilots within TSAT window, then the TSAT of the flight shall be considered expired and will be removed from departure sequence.

If start-up/push-back clearance requested by pilots is after TSAT window, ATC shall not issue start-up/push-back clearance and request related units (Airlines, GH) to update TOBT in order to receive a new TSAT.

In case that ATC is unable to issue engine start-up/push-back clearance within the TSAT window due to certain special reasons such as VIP flights or unfavourable operational conditions, the flight crew will be notified to "standby." Subsequently, ATC will issue a new TSAT for the flight based on the actual operational activities at the airport, ensuring that it does not disrupt the departure sequence of previously allocated aircraft. ATC will then issue engine start/push-back clearance within the adjusted TSAT window and ASAT shall be recorded for data analysis.

Pilots shall check for updates of TOBT, TSAT directly on A-CDM Portal.

In case pilot cannot check for the updates of TOBT, TSAT on A-CDM Portal, he/she shall be responsible for contacting with GH or ATC to receive TSAT via RT/VHF.

2.3.6  Phases of A-CDM flights

2.3.6.1  Planning phase

  1. Airlines schedule flights timetable for the next day and submit to Noi Bai Operational Control Centre - Noi Bai International Airport by 0300 previous day.

  2. Noi Bai International Airport inserts the next day flight schedule into SMIS system and arrange stands for flights by 1300 previous day. For airlines without representative at the airport, GH shall be responsible for submitting flight schedule to Noi Bai International Airport.

  3. Flight is established INI status in the system when airlines send FPL draft to Noi Bai ARO/AIS Center via AMHS/AFTN system or AIS/AIM/email system or submit directly no later than:

    1. 150 minutes before EOBT for domestic flights that submit FPL remotely.

    2. 210 minutes before EOBT for international flights that submit FPL remotely.

    3. 60 minutes before EOBT when submitting hard copy of Proposal FPL to Noi Bai ARO/AIS Center.

  4. For flights that depart from airports and airspace of Level 2/ Level 3 Multi-Nodal ATFM Network to airports and airspace of Level 3 Multi-Nodal ATFM, the timing of FPL submission shall comply to the current ATFM Multi-Nodal Operational Procedures of Vietnam.

2.3.6.2  Arrival phase

  1. Flight is established FIR status in the system 10 minutes after AMAN system automatically sends the first ELDT message to A-CDM Portal.

  2. Flight is established FNL status in the system 5 minutes before ELDT, aircraft is at final-approach phase.

  3. Flight is established LND status in the system after:

    1. Aircraft landing.

    2. The time aircraft touches down on RWY is the reference time for ALDT and ALDT message is automatically sent from NOVA9000/SMIS to A-CDM Portal.

2.3.6.3  Ground Service Phase

  1. Flight is established IBK status in the system when: Aircraft is arrived at stand and GH records AIBT value of the flight.

  2. Flight is established BRD status in the system when: GH updates the boarding time of passengers by inserting ASBT in the system or directly input into A-CDM Portal, based on the time the first boarding card is scanned at the boarding gate.

  3. Flight is established RDY status in the system when:

    1. Ground service is completed;

    2. Aircraft is ready when notified by the pilot that the preparation process in the cockpit is completed, all gates are closed, passenger bridge and equipments are removed, tow tractors are ready to tow as soon as receiving TWR clearance. GH directly insert AEGT in the internal system connected to A-CDM Portal or directly insert in A-CDM Portal. During phase 1. AEGT is determined by ARDT.

2.3.6.4  Departure phase

  1. Flight is established OBK status in the system when:

    1. Aircraft taxi out of stand;

    2. GH input AOBT in the internal system connected to A-CDM Portal or directly input in A-CDM Portal.

  1. Flight is established DEP status in the system when:

    1. Aircraft takes off from RWY;

    2. A-CDM Portal receives ATOT via NOVA9000 or DEP message from SMIS.

2.4  Reversion to current operational procedures

In case the A-CDM procedures are postponed due to TOBT or TSAT becoming unavailable, pilot and ATCs shall reapply "First come, First served" operational procedure. The temporary discontinuation or the resumption of the A-CDM, Noi Bai International Airport shall proactively coordinate with the skateholders to make the decisions. Notification of the transforming or the resumption of A-CDM shall be informed the skateholders and pilots by Noi Bai International Airport through display of A-CDM Portal.

3 — CANCELLATION

This AIP Supplement shall remain in force until its content has been incorporated into the AIP Viet Nam.