NG Stab Trim Overide Switch

[RationalKeith]

Acucuracy please (precise erminology)

Accuracy please.

Precise terminology is part of what is necessary to achieve that.

Obviously there are stabilizer trim command switches on each control wheel, which is at the _top_ of the control column.O

bviously there are stabilizer trim cutout switches on the aisle/stand/pedestal/whatever, behind the throttles. (‘Override’ would not be the best term for them, as they disable stabilizer electric trim.)

And of course the manual trim wheels beside the throttles, each having a handle that flips out from a detent. Each with a white stripe so help detect movement of them, offset in angle from each other to increase likelihood of seeing movement.

The question in the MAX MESS is whether or not there is a function resulting from something at the _bottom_ of each control column, that stops stabilizer trimming when the column is pulled hard back. (People refer to a ‘switch’, it could conceivably be interpretation by a computer of the force sensor that is there.) Hidden from pilots._Perhaps_ the slow processing discovered by the FAA involves that function.

And in this PPruNE thread there is suggestion of a switch that crew can use to override an automatic over-ride performed by an FCC in certain conditions.

(Plus now there’s a claim out of Europe that the autopilot doesn’t always ‘properly disengage’ when commanded. I presume command is by a big switch on the AP control panel on the glareshield.)

Read AvWeb and Bloomberg, PPrune won’t let me post the URLs.)


It's been suggested that some of the defects found in reviewing MCAS exist on the NG as well.