Hi all,I failed all three engines simultaneously @ FL370, and after about 30 seconds the controls locked up tight, even with the HYD and ELEC ADGs all ON. Also the APU won't start, it just flashes ON for a few seconds and returns to OFF. Any ideas? I've tried it at least five times.

Just guessing.. did you deploy the ADG? As I recall, the lever at the rear of the center console needs to be move this way and that, sorry, I really don't recall.Please add your name to your posts here. Thanks.

When you push the ADG ELEC button, the HYD AUX pump 1 isn't powered anymore. Wait with pushing the ADG ELEC button until one engine is restarted. (see emergency checklist).APU start is possible up to FL250.