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Why Do Airbus Elevators+Ailerons Droop Down?  
User currently offlineOlympic A-340 From United States of America, joined Apr 2000, 780 posts, RR: 11
Posted (12 years 4 months 2 weeks 6 days 21 hours ago) and read 2046 times:

I have a quick question about Airbus aircraft, Why do the Elevators and Ailerons "droop" downward when the aircraft's engines are shut down? Also when the engines are started back up after push back, why does the plane make this grinding sound? My theory is that it is the hydralics being turned on or off, but could you please explain in better detail why this happens.
Thanx

Arrivederci
Olympic A-340



3 replies: All unread, jump to last
 
User currently offlineHeavyJet From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 4 months 2 weeks 6 days 3 hours ago) and read 2001 times:

They droop do to the lack of hydraulic pressure from the engine driven hydraulic pumps or the electric hydraulic pump running.

As for the grinding sound, you'll have to be alittle more specific has this could be numerous things.

User currently offlineHeavyJet From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 4 months 2 weeks 6 days 3 hours ago) and read 1996 times:

Now that I think about it, the closes thing to a "grinding" sound you hear may be the jackscrews as the flaps/slats are being lowered.

User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 38
Reply 3, posted (12 years 4 months 2 weeks 6 days 1 hour ago) and read 1982 times:

Under Tech/Ops, look at the topic "Ailerons" for an explanation.


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