Sriwijaya Air missing after take off from Jakarta 09JAN21

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Homo Aeroportus
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Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by Homo Aeroportus »

A Boeing 737-500 of Sriwijaya Air operating the flight between Jakarta and Pontianak went missing 5 minutes after take-off on 07:40 UTC.

PK-CLC 09JAN21.png

According to FR24 the aircraft reached about 10 000 ft before falling sharply.

Looks like a bad start of the year.

H.A.

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by TLspotting »

Might be the first images :
Reports of 56 passengers on board.
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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by TLspotting »

56 passengers + 2 pilots + 4 CCM
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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by Homo Aeroportus »

Couldn't access AV24 for the last 20 minutes :(

FR24 is proceeding the granular data but the raw doesn't look good indeed, see graph below.

PK-CLC Alt Speed Graph.png

H.A.

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by luchtzak »

Homo Aeroportus wrote: 09 Jan 2021, 12:37 Couldn't access AV24 for the last 20 minutes :(
H.A.
The forums were unavailable due to high visitor load. All ok now.


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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by Jeremy De Winter »

TLspotting wrote: 09 Jan 2021, 12:16 Might be the first images :
Reports of 56 passengers on board.
Attachments
Passenger list
Passenger list


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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by luchtzak »

The crash was confirmed by Indonesian Minister of Transportation Budi Karya Sumadi.

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by TLspotting »

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by TLspotting »

Rescue and search to resume at 2300 UTC.

ELT didn't power itself.
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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by TLspotting »

02:11 UTC : Some bodies and pieces found.

03:40 UTC : Crashsite found.

Reports that the aircraft might have exploded in mid-air, according to a fisherman and some citizens heard 2 explosions.
Update :

23 meters depth for the crashsite and...
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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by crew1990 »

TLspotting wrote: 10 Jan 2021, 09:39 Reports that the aircraft might have exploded in mid-air, according to a fisherman and some citizens heard 2 explosions.
Everything was normal and then, all of the sudden the airplane drop at almost the same acceleration than the gravity, I don't see what else it could be than an explosion or a dislocation of the aircraft. Even with Andreas Lubitz on a 737max the plane wouldn't have descended that quick...

Now they got the black boxes I hope we will soon find out what really happend, if it was a bomb, I guess "they" would have waited for the aircraft to be higher to make it explodes, around 10000ft, it still kind of low.

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by TLspotting »

crew1990 wrote: 10 Jan 2021, 15:44
TLspotting wrote: 10 Jan 2021, 09:39 Reports that the aircraft might have exploded in mid-air, according to a fisherman and some citizens heard 2 explosions.
Everything was normal and then, all of the sudden the airplane drop at almost the same acceleration than the gravity, I don't see what else it could be than an explosion or a dislocation of the aircraft. Even with Andreas Lubitz on a 737max the plane wouldn't have descended that quick...
If the aircraft was overspeeding, they might consider flutter effect if it got dismantled...
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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by Homo Aeroportus »

For once I will disagree with you Crew1990.

I think that a free fall would have taken longer, especially considering the aerodynamic drag applied on a fractured airframe.

They were at 10900 ft at 07:40:05 and at 250 ft only 22 seconds later. That is an average V/S of 29000ft/min !
I know that the data provided by FR24 would need to be refined but they are rather consistent, see graph below.
PK-CLC Alt Drop and ROD.png
The T0 is 07:40:05 when they departed 10900ft. The red line shows the rate of descent accrued from T0, i.e. they reached an average of 29000ft/min at the end of the descent.
The V/S increased from 3500fpm when falling 175ft in 3 seconds, through 17k, 24k, 40k and finally 44000ft/min when dropping between 5400 to 250ft in 7 seconds.
I think they were under power during that tragic descent.

But considering the combination of the vertical speed with the G/S indicated by FR24, the airframe may well have broken up shortly before impact.

Whatever caused this, it was indeed very sudden and no one had time to react, realize.
Real sad way to go.

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by TLspotting »

It's like I saw a tweet of airlive.net saying "pilots didn't squawked 7700 before crashing"...

Like if :
- They had the time to react
- It was an invincible mode

So pretty useless tweet...
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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by sdbelgium »

Homo Aeroportus wrote: 10 Jan 2021, 20:01 For once I will disagree with you Crew1990.
I have to agree with you, H.A. To me, it doesn’t seem like a disintegration of the airframe before hitting the water, the debris field is too small and the ADS-B kept transmitting credible information until an altitude of 250’ IIRC. The vertical speed, as you said, was way higher than the gravitational acceleration. Things that come to mind for me right now are a mechanical problem with the tail control surface, unlocked thrust reverser (or other catastrophical component failure leading to a loss of control) or a deliberate flight control input, but I will await more details from the investigation.

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by sn26567 »

Indonesian divers have found the casing of Sriwijaya 737's second black box, the cockpit voice recorder, but the memory unit is missing!
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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by luchtzak »

sn26567 wrote: 15 Jan 2021, 12:20 Indonesian divers have found the casing of Sriwijaya 737's second black box, the cockpit voice recorder, but the memory unit is missing!
:? :shock:

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Re: Sriwijaya Air missing after take off from Jakarta 09JAN21

Post by sn26567 »

The first data read from the flight data recorder show that both engines were still running when the aircraft hit the water.

All 330 parameters of the FDR were read out in good condition.
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