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Hawaiian Had Trim Problem, Diverted to SEA


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Hawaiian Had Trim Problem, Diverted to SEA

Old 12-30-2010, 10:00 AM
  #11  
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Originally Posted by rickair7777
but the pitch trim can have serious consequences if it fails in a certain manner on some airplanes (Alaska 261)..
261 was not the result of a pitch trim problem. Please don't cite specific accidents if you are unaware of the cause factors.
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Old 12-30-2010, 10:56 AM
  #12  
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Originally Posted by Fishfreighter
261 was not the result of a pitch trim problem. Please don't cite specific accidents if you are unaware of the cause factors.
If it wasn't the trim, what was it?
I've always understood it to be a trim problem (the trim problem was the result of a faulty part and improper maintenance).

Quoting from Wikipedia (and indirectly from the accident report):

The probable cause was stated to be "a loss of airplane pitch control resulting from the in-flight failure of the horizontal stabilizer trim system""
The jammed stabilizer prevented operation of the trim system, which normally would make slight adjustments to the flight control surfaces to keep the plane stable in flight.
Repeated attempts to overcome the jam with the primary and alternate trim systems were unsuccessful
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Old 12-30-2010, 12:42 PM
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Originally Posted by abelenky
If it wasn't the trim, what was it?
I've always understood it to be a trim problem (the trim problem was the result of a faulty part and improper maintenance)
Perhaps you should read the accident report instead of relying on wikipedia (the place where anybody can post anything).

Quoted directly from the NTSB report:


"The National Transportation Safety Board determines that the probable cause of this accident was a loss of airplane pitch control resulting from the in-flight failure of the horizontal stabilizer trim system jackscrew assembly’s acme nut threads."

Lack of understanding of the system operation would lead you and others to ASSUME it was a trim system failure. However, while the jackscrew is part of the trim system, it was not the trim system that failed. Rather it was the jackscrew acme nut that failed resulting in the excessive deflection of the horizontal stabilizer beyond controllable limits.

Personally, I'd refrain from commenting on accidents you have no knowledge about, especially if you're relying on Wikipedia for the "facts."
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Old 01-01-2011, 07:54 PM
  #14  
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I know the crew that worked the flight. Flown with the captain as well...both very good reputations.
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