Indonesian aircraft missing off Jakarta

[flyhigh85]

Originally Posted by Localiser Green

The same aircraft apparently had an unreliable speed issue on the previous flight from Bali to Jakarta last night. This was reported by the pilots according to Bloomberg.

FR24 data from that flight shows the aircraft enters a descent after takeoff, with increasing speed, similar to the event which happened on this flight at approximately 2,000ft. However on the DPS-CGK flight it happened at around 5,500ft.

14:25:21 - 5,500ft - 282kt
14:25:48 - 4,625ft - 324kt
14:26:13 - 5,400ft - 303kt
14:26:25 - 6,300ft - 276kt
14:26:37 - 6,600ft - 265kt
14:26:49 - 7,400ft - 247kt



Suggests around 2,000fpm descent rate with 42kt speed gain, followed by 3,000fpm climb losing 77kt. That's not a normal climb profile so something went wrong here, assuming the ADS data is accurate.

An aircraft can stall at any speed! It is the angle of attack which determines when stall (pitch angel) if they had flew at 350kt they would stall anyway if the nose was 40 degress nose up. A passenger airplane is is not designed nor have the trust required to do that, a rocket is a different thing.

i can’t remember exactly how it is but if your static or pitot ports are blocked (either one) your airspeed will increase with altitude. So if they put on the autopilot after take off the plane will pitch up and up to contain the airspeed increase and rather quickly put the aircraft in an unusal attitude, nose high low airspeed (actual airspeed). Autopilot will disconnect and stall warning alarms etc. If the pilots don’t react quicly and correct the airplane will stall. There might be a startle factor for the crew as well, which delay their reaction time. This only speculations from my side anyway. Tragic to see another fatal accident in Indonesia.