actually a failure of all three hydraulic systems caused by a faulty fan blade rupturing the lines, engines 1 & 3 were running until impact, crash was due to poor hydraulic design, and a cracked fan blade that had been outsourced for rebuild, but was pencil whipped and returned for service, all flight controls disabled, the plane was actually "flown" by varying thrust on remaining engines to basically have a controlled crash

This post was edited on 9/19/14 at 6:20 pm

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Posted by holmesbr

Baton Rouge, La.

Member since Feb 2012

3049 posts

Posted on 9/19/14 at 10:43 pm to 777Tiger

777, This the Sioux City crash? I heard the captain from that plane give a talk about it in BR. Very interesting hearing from first hand on it. Has anyone been able to duplicate that flight in the sim?

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Posted by AUTimbo

Member since Sep 2011

2880 posts

Posted on 9/21/14 at 10:05 am to 777Tiger

quote:
due to poor hydraulic design, and a cracked fan blade that had been outsourced for rebuild, but was pencil whipped and returned for service,

Wrong. The number two engine had a titanium fan disc come apart caused by an inadequate forging by the disc manufacturer. A titanium inclusion which didn't melt out during the forging of the disc (approximately 1/64" in diameter) caused a service induced stress crack which propagated during the life of the disc. Overhaul facility missed the crack at last overhaul and disc disintigrated during flight when crack reached fan blade root area. Subsequent uncontained explosion resulted in fan blade/ blades sheering all hydraulic lines in tail of a/c.

GE and the overhaul facility in litigation for many yrs over cause of disc failure.
GE saying overhaul missed crack during FPI inspection.
Overhaul responded cause was GE missing inclusion at UT inspection of disc at forging facility.

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