12:40 -depart KLIA
1.22 -Fail to chk in with HCM
2:41 -Subang ATC 'lost contact'
Before this post goes into another 50 replies cycle as it already did twice on this thread:
Loss of transponder signal at 1:21 (closer to 1:22)
Subang center INFORMED MAS on loss of contact at 2:40 (2:41 by some sources)
In the intervening 1 hour 20 minutes both Sebang and HCM were trying to make contact with the aircraft. Only when the aircraft did not appear in range of Vietnamese primary radar was the alarm raised. Loss of transponder signal and communications happens on a daily basis somewhere in the world, with the aircraft usually appearing further down it's flight path and the crew mumbling a faint sorry to ATC.