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A330 Reversers  
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Posted (11 years 10 months 3 weeks 4 days 1 hour ago) and read 1520 times:

I took a picture of an EK A330 and noticed something strange: The reversers are engaged even though the main bogeys are not fully on the ground. The rear wheels of the bogeys seem to be on the ground but not the forward ones. Obviously, the nose gear is still airborne !
How can this be?


5 replies: All unread, jump to last
 
User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 1, posted (11 years 10 months 3 weeks 4 days 1 hour ago) and read 1514 times:

It depends how the air / ground logic system on the A330 works. On the 757 / 767 only the main wheels need to have made contact for the aircraft to decide it is on the ground, and for features such as auto-spoilers / autobrakes to become active. Reverse thrust can of course also be used once this is the case.

It is possible to use an aerodynamic braking method (with spoilers / full reverse) holding the nose wheel off the ground completely to assist with deceleration. The nose is of course gently lowered before the elevators lose their aerodynamic control authority.

Anyway I digress... on the 757/767 the air/ground logic system simply requires both main landing gear tilt sensors to detect ground contact, and both thrust levers to be at idle to sense "touchdown".



I used to love the smell of Jet-A in the morning...
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Reply 2, posted (11 years 10 months 3 weeks 3 days 23 hours ago) and read 1480 times:

Rick,
Note that the main bogeys were not even fully on the ground. Only the rear wheels of the main bogeys were on the ground and the spoilers had not even deployed yet. This may explain the extent of the wheel to ground contact. The reversers, however, are clearly engaged.


User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 3, posted (11 years 10 months 3 weeks 3 days 11 hours ago) and read 1368 times:

Is it possible to override the airborne-reverser-deploy mechanism by some circiut breaker or something alike?

-Alfredo


User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 4, posted (11 years 10 months 3 weeks 3 days 6 hours ago) and read 1350 times:

Bio15,

Probably, but certainly wouldn't be a standard procedure. Perhaps the A330 has a different logic for allowing reversers to be deployed (less than 5ft RA or something?). I know Airbus changed the air / ground logic after the Lufthansa over-run some years back (in Warsaw?). Made such a gentle touchdown they couldn't engage reverse, spoliers or brakes (if I recall correctly).



I used to love the smell of Jet-A in the morning...
User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 5, posted (11 years 10 months 3 weeks 2 days 22 hours ago) and read 1306 times:

Yes, it seems very logical to me. thanks  Smile

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