Indonesian 737 missing presumed crashed [SJ182 Jan. 2021]

[jb747]

Radar shows IMC however no severe CBs or anything.

IMC means the aircraft was in the cloud. I don’t think the radar image actually allows that distinction.

 

[tgh]

If the Indonesian Air Safety org leaks like a sieve as per local custom , media will be shortly telling us all what happened...

 

[Sprucegoose]

I am sure IAS will invite Boeing and the NTSB to assist which would bring an ordered discipline to the investigation. At this stage I am sure the crash area would be considered a crime scene.

 

[Saab34]

At this stage I am sure the crash area would be considered a crime scene.

Not In Indonesia! Finders keepers. Fishermen finds, fishermen keeps.

 

[Quickstatus]

PK-CLC used to be a CO/UA airframe - delivered 1994.
Sold to current owners 2012.
At the time of sale 45000hrs and 24000 cycles
Assumption is that the “rudder servos were all replaced by the time it was sold”.

 

[MEL_Traveller]

PK-CLC used to be a CO/UA airframe - delivered 1994.
Sold to current owners 2012.
At the time of sale 45000hrs and 24000 cycles
Assumption is that the “rudder servos were all replaced by the time it was sold”.

I just did a bit of a search on the number of cycles... as of October 2019 Qantas had 33 737s with an excess of 22,600 cycles, Virgin had 19 737s with 22,600 or more: The 'pickle fork' fault: Why the problem facing Qantas is no risk

 

[Quickstatus]

Aircraft (and pilots) were in storage due to Corona.

How easy is it to come back and pick where you left off.
(Again not insinuating this is related to the accident as a cause as there is no evidence )

 

[defurax]

So investigation seems to suggest autothrottle issues.

Crashed Sriwijaya Air jet had engine thrust imbalance - preliminary report

The Sriwijaya Air plane that crashed last month killing 62 people had an imbalance in engine thrust that eventually led the plane into a sharp roll and then a final dive into the sea, a preliminary report by investigators said on Wednesday.

www.reuters.com

 

[jb747]

Cruise control disengages. Car crashes.

 

[defurax]

Cruise control disengages. Car crashes.

So I presume autothrottle issues are supposed to be a non event?

 

[Must...Fly!]

Cruise control disengages. Car crashes.

Distressing comparison but seemingly justifiably accurate on what's been released so far. Sad.

 

[jb747]

So I presume autothrottle issues are supposed to be a non event?

What's below "non event"?

If it fails, and disengages, then move the levers as required. If one engine only misbehaves, then it's probably not the autothrottle per se, but either the clutch pack or the EEC (electronic engine control). In both cases press the autothrottle disconnect switch, and move the levers as required. If one (or both) engines still aren't behaving, then making sure the lever for that engine is mid range, turn the EEC off, and leave it off. Use thrust levers normally, but no autothrottle.

If you have asymmetric power, then it's no different to an engine failure. Apply rudder as necessary. Use the engine that is behaving as required (manually). After turning the EEC off, you should be able to go back to normal. Failing that, shut down the engine that is not behaving, and fly single engined.

 

[N860CR]

If you have asymmetric power, then it's no different to an engine failure. Apply rudder as necessary. Use the engine that is behaving as required (manually). After turning the EEC off, you should be able to go back to normal. Failing that, shut down the engine that is not behaving, and fly single engined.

If the crew has recognized it. The 737 family (right up to the M8) has no audible engine failure alert, and if the auto throttle retarded one engine, it would not have produced a visual caution (ie master caution or expanded ED)

Absolutely not an excuse for a competent crew to disregard a loss of trust, but climbing into cloud, with AP engaged and possible turbulence, added onto a severe lack of currency, does seem to be a few of the holes lining up. If the AP reached its limit and disengaged, handing over to a startled crew, I can see how the situation escalated.

 

[jb747]

If the crew has recognized it. The 737 family (right up to the M8) has no audible engine failure alert, and if the auto throttle retarded one engine, it would not have produced a visual caution (ie master caution or expanded ED)

We aren’t actually talking about an engine failure, so most aircraft would give no warning. As often as not, the first warning for an engine failure is a generator warning, though leaping to the generator checklist won’t solve anything.

Asymmetric thrust will show up with the autopilot applying aileron to maintain wings level. It probably won’t disengage until a very large proportion of the travel is used. Watching/feeling the control wheel displace itself is a bit of a red flag.

 

[flydoc]

CVR recovered

https://au.news.yahoo.com/sriwijaya-jets-coughpit-recorder-found-064348558.html

 

[dajop]

A suggestion for mods, can the thread title be altered to incorporate reference to airline and date of crash.? When the current thread title appears in a feed (unread posts), it’s sort of a bit startling. (That dreaded oh no again feeling).