Originally Posted by Sir Herbert Gussett
To give it a try? Are you lot mad? I hope that was done in a simulator and not with paying passengers on board! You are paid to fly from A to B as quickly as possible, and as safely as possible - not faff about as a test pilot playing with your huge toy!!!
There is no panic to have here. It is not question to intentionally shut off one hydraulic system or shut down one engine. You are paid also to know how your aircraft works, and the question
Bubi352 was presenting is absolutely legitimate and a clear sign of interest for better knowledge.
There is a multitude of stuff you can try in flight with absolutely no ill effect, as long as it does not compromise the safety of the flight. Of course, both crew members must be involved in the process.
Is there a danger to give it a try and arm the approach at 20000 feet, absolutely none, as long as you're ready to intervene if the aircraft is not doing what you expect him to do.