Originally Posted by
torghabe
Hi there! Situation was: just after takeoff EICAS message L OUTFL VALVE illuminated and at CMC page was AC MOTOR. Crew do not start appropriate check list yet, but left outfl valve slowly moved to full close position. Why? The brakes should hold faulty valve when AC motor inop. Right valve operates normally. Control logic? I do not find answer. Thanks in advance!
What did the CMC say about the AC motor? Did it fail to operate, or fail to stop when commanded? Was it a transient fault?
You probably don't have the answer to these questions. That's pretty much by design, to help prevent pilots from second-guessing the EICAS and QRH, and delaying action while searching for info in the CMC. Why were you reading the CMC before the QRH checklist was completed? If you were a 3rd pilot on board, isn't your duty to assist with the checklists?
If the AC motor failed, the DC motor may have taken over trying to drive the valve toward CLOSE, while you were troubleshooting and [not] doing the checklist.