Minuteman
Topic Author
Posts: 260
Joined: Sat Aug 05, 2000 1:01 am

So You've Excedded Vle, Now What?

Tue Jun 19, 2001 8:21 am

What is the first mechanical anomaly most likely to occur as an aircraft continues to exceed the maximum permissible airspeed with the landing gear extended.

I would imagine there's some factor of safety included in the placarded speed before the gear flies off, but what about overstressing fasteners, gear doors coming off, etc?
 
aaron atp
Posts: 517
Joined: Sun Mar 19, 2000 1:17 pm

RE: So You've Excedded Vle, Now What?

Tue Jun 19, 2001 1:49 pm

On Gulfstreams, the half of the main gear doors that attaches to the gear strut is held at 2 points. At the top, it is fastened well, but at the other end it only has a single long rod about 6 inches from the bottom. This half of the door is about 15" wide and 24" tall, with it 1" thickness exposed to the wind.

If the aircraft was in any kind of sideslip above VLE the rod would probably snap and the door would twist and possibly fly off.

The part of the nose gear doors attached to the nose gear would be the next thing to bend, especially since it presents quite a bit of surface area (8" wide by 20" tall) into the wind.

What would occur if the gear was operated above VLE or VLO is a completely different scenario.



aaron
 
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RE: So You've Excedded Vle, Now What?

Tue Jun 19, 2001 2:15 pm

Aaron is right.. it is mainly a restriction for operating the gear. I dont know about airliners, but in the seminole for an emergency descent we had to slow to below 140 knots (Vle), drop the gear, and dive down maintaining 140 knots. The biggest danger in that airplane for cycling the gear above 140 was that the nose gear had to come forward into the wind, which could cause it to not lock in place.
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