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Report: Flight control system problem caused F/A-22 crash
Air Force Link ^
| 6/8/2005
| AFPN Staff
Posted on 06/09/2005 5:26:40 PM PDT by Excuse_My_Bellicosity
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To: expatpat
apparently due to a problem with the system handbook. No, it was caused by a lack of electricity. If a battery (or as another poster pointed out, a capacitor) had been wired into the system, there would not have been a power loss in the brief period of time between engine shutdown and apu takeover.
The problem might be solvable by either a manual or computer driven cut-over to the APU before the engine is shut down.
21
posted on
06/09/2005 6:46:26 PM PDT
by
PAR35
To: expatpat
Sensor , Computer , its all part and parcel of the system.
To: PAR35
Well, there are multiple problems here, but the pilot believed after reading the 'manual' that the APU would continue to power the sensors with the engine off. That is a perfectly normal thing to expect, and the system handbook should have highlighted a deviation from this.
The lack of electricity would have not been an issue if the pilot had known this. He would not have tried to take off until the gyros were fully up to speed, and no battery or capacitor would be needed.
23
posted on
06/09/2005 6:56:00 PM PDT
by
expatpat
To: expatpat
I'd call it a software design drop-out. Such sequence after unsual circumstance contingencies can be caught by astute designers or testers. However many aren't. I caught some on an F/B eject sequence wherein a system failover occurred. They had been there, latent, for years and years.
But I am not representative of the average sw engineer. Sui generis.
24
posted on
06/09/2005 7:00:30 PM PDT
by
bvw
To: expatpat
I'm sure this mishap caused some tech order changes.
To: bvw
There's an old saying in the software business: "You never find the last bug". You could call it a software problem, I suppose, but it seems more like a system-design problem. The power to flight-critical sensors should itself be regarded as flight-critical, and the lack of such power in the case of an engine failure/shut-down in flight is IMO a BIG mistake.
It's a good job it was caught during test and eval, and no one was hurt.
26
posted on
06/09/2005 7:45:05 PM PDT
by
expatpat
To: Excuse_My_Bellicosity
Yeah, and maybe one or two engineering vacancies.
27
posted on
06/09/2005 7:46:58 PM PDT
by
expatpat
To: sgtbono2002
Fly by light when it is about F/A-22...
28
posted on
06/09/2005 10:04:15 PM PDT
by
Wiz
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