Originally Posted by
FlyingStone
QRH for B737 aircraft has long stated under the Runaway Stabilizer NNC as below:
But in an MCAS nose down trim situation it doesn't. It can be stopped by main trim and then runs again when main trim is not active. So the condition statement is not completely correct and may explain why the crew who switched the trim system off in the first LionAir incident wrote it up as "speed trim working in reverse"