2.2.3.1  SOBT

SOBT: Aircraft start moving out of the current stand as planned. The time leaving stand of aircraft is issued base on seasonal schedule flight permitted by CAAV.

2.2.3.2  EOBT

EOBT: Expected time for aircraft to move 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 NIA before 03:00 daily.

In operation day, EOBT will be updated by FPL or DLA/CHG messages, as detailed:

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

   1. 150 min before EOBT for Domestic flights.

   2. 210 min before EOBT for International Flights.

   3. 60 min before EOBT when submitting hard copy Flight Plan at ARO/AIS centre.

1. Noi Bai ARO/AIS Centre is responsible for issuing FPL to stake holders via ATFN/AMHS no later than 15 minutes compared to the approved FPL.

2. AO shall notify Noi Bai ARO/AIS if new EOBT is available (for delay >15 mins but <60 mins compare to EOBT). Except for flights departing from NIA to airports and airspace of Level 3 Multi-Nodal ATFM Network, ATS flight plan submission and relevant information about generating ATS message (including DLA, CNL, CHG messages) shall comply to Level 2 ATFM Multi-Nodal operational procedure. Noi Bai ARO/AIS Centre promulgate DLA message as regulated.

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

2.2.3.3  ALDT

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

2.2.3.4  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 daily FPL, the 1st TOBT will be set equal to EOBT (before TOBT calculated automatically following the formula).

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 staying 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, the GH is mainly responsible for updating TOBT. The GH will consider available resources and their own planning as well as agreed procedure with airlines in updating TOBT for flights.

Pilot should continue monitoring TOBT to get the accuracy of +/- 5 min. If cannot achieve TOBT +/- 5 min, 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 TOBT.

The number of manual TOBT update will be limited to no more than 3 times within 30 minutes before EOBT.

2.2.3.5  TSAT

The TSAT is provided base on the TOBT, CTOT and/or ATC situation/status. Base on those factors, aircraft is expected to be approved for starting engine/being pushed back or taxiing.

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

2.2.3.6  Start-up procedure

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

At TSAT+/-5min, Flight Crew will request and receive start-up approval from the ATC.

TSAT window: +/- 5 minutes from TSAT. If the 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 the start-up clearance requested by pilots is within TSAT window, ATC is responsible for issuing start-up/push-back approval clearance if possible.

For flights that require an idle engine start before starting all engines for departure, the flight crew shall actively estimate the idle engine start time to ensure that the aircraft will start all engines for departure within the TSAT window. The flight crew should inform the GH personnel of this information so that they can decide if it is necessary to update the TOBT of the flight (note: the idle engine start time should be added).

For aircrafts that need to be pushed out before starting the engines, the flight crew shall actively estimate the time to request pushback clearance from ATC. Once the pushback 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 the 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 the 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 ATC is unable to issue startup/pushback clearance within the TSAT window due to certain special reasons such as VIP flights or adverse operational conditions, the pilot 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 startup/pushback clearance within the adjusted TSAT window.

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

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

2.2.4.1  Planning phase

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

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

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 min before EOBT for domestic flights

2. 210 min before EOBT for international flights

3. 60 min before EOBT when submit FPL directly to Noi Bai ARO/AIS centre

2.2.4.2  Arrival phase

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

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

Flight is established LND status in the system when:

1. Aircraft land;

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

2.2.4.3  Ground Service Phase

Flight is established IBK status in the system when: Aircraft is into stands and ground service unit accept flight AIBT value.

Flight is established BRD status in the system when: Ground Service unit update the time customers start boarding by inserting ASBT in the system or directly insert into A-CDM Portal, based on the time the first boarding card scanned at the boarding gate.

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. Ground service unit 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.

2.2.4.4  Departure phase

Flight is established OBK status in the system when:

1. Aircraft is out of the stands;

2. Ground service unit insert AOBT in the internal system connected to A-CDM Portal or directly insert in A-CDM Portal.

Flight is established DEP status in the system when:

1. Aircraft depart from RWY;

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