PPRuNe Forums - View Single Post - US administration blames foreign pilots for 737 Max crashes
Old 17th May 2019, 11:34
  #53 (permalink)  
Luc Lion
 
Join Date: Mar 2006
Location: Vance, Belgium
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Originally Posted by Bend alot
https://news.ycombinator.com/item?id=19902068
"WASHINGTON—A simulator session flown by a U.S.-based Boeing 737 MAX crew
...
but did not get the aircraft back to level trim, as the 737 manual instructs before de-powering the stabilizer trim motor.
...
"
That statement is wrong.
There is nothing in the FCOM nor in the QRH that instructs to use electric trim buttons to put the aircraft in trim prior to flip the cutout switches,
even though I reckon that, calmly sitting in a chair in front of a computer, it looks like a good idea.

The QRH just says
If the runaway continues:
STAB TRIM CUTOUT switches (both) . . . . . . . . . . . . . . . . CUTOUT.
The only information akin to that is in the airworthiness directive AD 2018-23-51 and it only says:
Note: Initially, higher control forces may be needed to overcome any stabilizer nose down trim already applied. Electric stabilizer trim can be used to neutralize control column pitch forces before moving the STAB TRIM CUTOUT switches to CUTOUT.
(my emphasis)

"can be used", in a note, is hardly an instruction.
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