A2157
MH370 Transponder Code A2157
1. Background
For flight MH370 on 8 March 2014, Malaysia Airlines Boeing 777-200ER registered as 9M-MRO was assigned a mode-A transponder code of A2157.
2. Assignment of SSR Transponder Code
At 0026:41 MYT, 8 March 2014 the Air Traffic Controller at Lumpur Delivery assigned the code 2157 to MH370 in the following instruction:-
Malaysian Three Zeven Zero is cleared to Beijing via Pibos Alpha Departure six thousand feet squawk two one five seven.
Source: Air-Ground Communications between MH370 and Approach Radar - see Transcript in timeline at 0025:52 MYT
3. Disappearance of code 2157 at 0121:13 MYT
...the last secondary radar position symbol of MH370 was recorded at 1721:13 UTC (0121:13 MYT).
The disappearance of the radar position symbol of MH370 was captured by the KL ACC radar at 1721:13 UTC (0121:13 MYT). The Malaysian military radar and radar sources from two other countries, namely Viet Nam and Thailand, also captured the disappearance of the radar position symbol of MH370. The Bangkok radar target drop occurred at 1721:13 UTC (0121:13 MYT) and Viet Nam’s at 1720:59 UTC (0120:59 MYT).
Source: Safety Investigation Report MH370/01/2018 1.1.1