STL 737max gone
Aug 19, 2019, 3:46 pm
#16
Join Date: Jun 2004
Location: ATL
Programs: Delta PlM, 1M
Posts: 6,365
CUTOFF DEVICE WE HAVE NEVER TOLD YOU ABOUT
Many of the odd design issues look to be related to Boeing's need to hide the system in order to sell the MAX as "no training needed".
Aug 19, 2019, 8:29 pm
#17
Join Date: Aug 2016
Location: SFO
Programs: AA,UA,AS
Posts: 319
Aug 19, 2019, 8:39 pm
#18
Join Date: Jan 2001
Location: IAD/DCA, USA (MD Suburbs)
Programs: AA Lifetime PLT, HH Diamond, Fairmont RIP, Hertz Plat, BA Gold
Posts: 1,624
There was a Max in STL from March 14 - April 17 (N341RW). It flew to Tulsa on 17-April. All AA 737-max are in either Tulsa or Roswell. None have flown since their ferry flights in April (according to FR24).
Aug 20, 2019, 10:55 am
#20
Join Date: Nov 2010
Programs: AA PLT 3MM
Posts: 1,135
Yes it can, but only by totally disabling the electric trim, meaning that pitch trim would have to be achieved using the manual wheel. The 737 NG had two trim cutoff switches - one to disable yoke-controlled electric trim and the other to disable auto-pilot trim control. For some reason on the 737 MAX Boeing wired the two switches in parallel so that turning a single one off changed nothing and turning both off completely disabled electric trim. Their justification for doing this (and not telling anyone in training) was that all the published emergency procedures for runaway trim involved turning both switches off so weren't affected by the change. I believe that in the Ethiopian crash the pilots tried to re-enable just the yoke-controlled trim (because they couldn't turn the wheel fast enough to avoid a crash) and MCAS then put the final nail in the coffin because of this change.