Mb339 From Italy, joined Jun 2001, 238 posts, RR: 3 Posted (12 years 4 months 3 weeks 5 days 7 hours ago) and read 5861 times:
I've got a question about Airbus A320 electrial system
If i press both p/b of the generator to the OFF position , AC BUS 1 and 2 will be no more powered.
The question is: Will the RAT deploy automatically or not in this case?
A320FO From Austria, joined Oct 2000, 211 posts, RR: 1
Reply 1, posted (12 years 4 months 3 weeks 5 days 3 hours ago) and read 5782 times:
Short answer: Yes, the RAT will deploy.
The automatic deployment requires three conditions to be met: AC BUS 1 OFF, AC BUS 2 OFF, ADIRS 1 > 100KT
All fulfilled, the RAT will deploy. As a signal on airspeed is required, it can't happen on ground.
Manual extension is NEVER inhibited, it can be initiated at any time. Thats why the buttons are guarded.