Where's the missing MCAS automatic trim commands?
From the preliminary report of the ET302 accident.
(many copies around the internet)
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At 05:40:35, the First-Officer called out “stab trim cut-out” two times. Captain agreed and First-
Officer confirmed stab trim cut-out.
At 05:40:41, approximately five seconds after the end of the ANU stabilizer motion, a third instance
of AND automatic trim command occurred without any corresponding motion of the stabilizer,
which is consistent with the stabilizer trim cutout switches were in the ‘’cutout’’ position
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At this point, the trim cutout switches were shutting down the output from MCAS reaching the trim motors. So, why are there no more automatic MCAS trim commands recorded? (Cyan color in the Flight data recorder tracings on page 26 of the report) The trim cutout switches shouldn't inhibit the FCC from issuing commands, just the trim motor being cutout. For approximaty two minutes, MCAS should be issuing 8 or 9 more AND automatic trim commands but, they aren't on the data trace. Flaps are up, AOA is off the chart, A/P is OFF. The only change is the stabilizer trim cutout switches were in the cutout position. How should that change MCAS from issuing more AND automatic trim commands? The trim motor is cutout from accepting the commands, but, they should still be issued from MCAS, unless there is some connection between one or both of the stabilizer trim cutout switches and the FCC MCAS program somehow? Only when the stabilizer trim cutout swiches are turned back to normal, do the automatic trim commands reappear at the end of the flight.