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Old 7th Apr 2019, 06:50
  #3519 (permalink)  
Derfred
 
Join Date: Jun 2006
Location: Brisbane
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Originally Posted by spornrad
Before the MCAS input the PF trims up twice with the thumb switch for appr. 3 s each. This results in appr 1 U uptrim stab movement, twice.
At 5:40:15 after the first MCAS ND he trims again up for appr. 3 s. The stab movement is barely visible now on the chart. Then, unusual:
At 05:40:27, the Captain advised the First-Officer to trim up with him.
Why? Is his switch not working correctly?
The trim up (together or) by the FO is the only long one in the entire FDR recording. It shows again a stab movement at appr 1 U / 3 s. It is followed by STAB TRIM CUTOUT.
Is it possible that the PF had a broken trimswitch?

The earlier trim durations you refer to happened with flaps extended. The trim wheel moves faster with flaps extended. That explains the difference.
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