1.1  The purpose of this AIRAC AIP Supplement is to notify aircraft operators of implementation of Departure Clearance (DCL) via Data Link at Suvarnabhumi Airport with effect from 3 October 2024,0000 UTC.

1.2  The DCL service aims to further improve the accuracy and reliability of departure clearance operations, reduce the workload of pilots and ATC, and decrease congestion on the Clearance Delivery Control radio frequency.

1.3  This AIRAC AIP Supplement supersedes AIRAC AIP Supplement A7/11

2.1  The DCL Service will be applied to flights departing from Suvarnabhumi Airport on the following ATS Routes:

1. Southbound: A464, M751, M757, R201, M904, W19, W31, G458, Y8, Y11

2. North-Eastbound: A1, Y16, Y14

3. Eastbound: G474, R468, N891, B204, N506, L880

4. Northbound: A464, R474, W9, W21, W39, B346, Y6

5. Westbound: G463, L301, L507, M502, P646

2.2  The DCL Service will be applied under the following principles:

1. Under normal circumstances, 6 000 ft shall be initially assigned.

2. First airborne, first flight level selection principle

3. No on-ground flight level negotiation and reservations

4. Cruising level shall be assigned by Bangkok Control after airborne

2.3  With DCL operations, the request for departure clearance will be initiated by the pilot. After satisfactory verification of the request,
the DCL system will respond with the departure clearance message.

2.4  All DCL messages (such as departure clearance request, departure clearance response and departure clearance read back) between aircraft and DCL system will be exchanged in accordance with the Airlines Electronic Engineering Committee (AEEC) Specification 623 (AEEC623: Character- Oriented Air Traffic Service Applications) for departure clearance and transmitted via data link service providers, between the aircraft and the DCL system directly.

2.5  The DCL service does not provide clearance revision. Any revision to the clearance issued via Data Link will be made by ATC through voice communications.

2.6  Clearance request through VHF using the existing voice communications is still available for application under the DCL service.

4.1  Pilot should initiate a Departure clearance request (RCD) no earlier than 20 minutes prior to Target Start-up Approval Time (TSAT), using ICAO call sign as filed flight plan and select the departure airport as “VTBS”

4.2  Pilot will receive a message (“RCD RECEIVED, REQUEST BEING PROCESSED, STANDBY”) to inform that DCL uplink message (CLD) will be delivered shortly.

4.3  Within 5 minutes after receiving the DCL uplink message (CLD), pilot shall select the “ACCEPT” function on the flight deck to acknowledge the departure clearance via Data Link.

4.4  Upon reception of clearance acceptance, pilot will receive a confirmation message (“CDA RECEIVED CLEARANCE CONFIRMED”) completing en-route clearance.

4.5  Examples of message formats are provided in the Attachment.

5.1  If there is any problem with the data link exchanges, pilot shall request the clearance through voice communications using the following frequencies:

Remark: IFR aircraft departing to VTBD, VTBU, VTBK, VTBL, VTPI and VTPH at or below FL160 are to call Bangkok Approach on 125.8 MHz

5.2  Further information and details of the DCL service may also be obtained from this address:

Mr.Seksan Sornmak

Director, Network Operations Department, Aeronautical Radio of Thailand Ltd.

102 Soi Ngamduplee, Tungmahamek, Sathorn, Bangkok 10120 THAILAND

Office: +662 285 9157

Mobile: +669 8553 9222

Fax: +662 285 9636

Email: seksan.so@aerothai.co.th