Originally Posted by
gearhorn
Was the RAT deployed before the RCS transitioned?
According to the transcript, the RAT had deployed and
started to provide hydraulic power. Around 7 seconds later, the APU door started opening. I suppose we would need to know which parameter is being monitored for "door open". Is it triggered when the door cracks open or only after it has travelled a certain amount. I know on the 777, there is a closed switch which loses its earth when the door moves away from fully closed, so the aircraft should get a change in status immediately.