PPRuNe Forums - View Single Post - 737 Stuck Manual Trim Technique
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Old 14th Apr 2019, 13:29
  #77 (permalink)  
FlightDetent

Only half a speed-brake
 
Join Date: Apr 2003
Location: Commuting not home
Age: 46
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The Mad Russian's profile has the shapes and sounds of the Rostov accident. While there is little if any connection on why and how, the "what" i.e. being unable to trim (fast) enough or overcome with the elevator a speed-dive to ground is identical.

With regards to the observed SIM behaviour: sounds like a training device quirk. If it was correctly replicating a jack-screw siezure due excessive loads, someone would have needed to code that behaviour into the simulation software - meaning it must had been a recognized and documented state in the first place. By all accounts, it is not.

Now, in this thread and elsewhere I read about
- (a) elec trim not able to go all the way to extreme NU/ND (but able to come back from within that range)
- (b) manual trim that does not have enough leverage in the mechanism to move THS under major mis-trim and simultaneous elevator load (the yo-yo recovery technique)

WILD SPECULATION: If either or both of the above two got incorrectly programmed for the SIM, a scenario that The Mad Russian describes could ensue.

Last edited by FlightDetent; 14th Apr 2019 at 14:45.
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