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DC-10: The Relation Between Ailerons And Gear  
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2566 posts, RR: 6
Posted (13 years 6 months 2 weeks 3 days 23 hours ago) and read 4167 times:

Below is a quotation from Capt Haynes (of the Sioux City DC-10 crash):

"There are two ways we can get the gear down on the DC-10 with
hydraulic failure. You can put the gear handle down, which manually
unlocks the doors and the doors fall open and the gear just falls out,
because it's been resting on the doors. Or, there's an alternate
method of doing that, when you use no flaps. Because we have four
ailerons on the DC- 10. You fly with the inboard ailerons at high
speed, and then you unlock the outboard ailerons for landing when you
lower the flaps. Well, we didn't have any flaps. So we couldn't
unlock the outboard ailerons. So that's what this alternate gear
method is for. And we talked about this: how do we put the gear down,
and it was suggested, we unlock with the outboard ailerons, with the
alternate gear
, because there might be something out there, because we
might be able to get some fluid out there, there might be some trapped
out there. "

Can anybody please explain the bold type?

5 replies: All unread, jump to last
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 24
Reply 1, posted (13 years 6 months 2 weeks 3 days 22 hours ago) and read 4120 times:

On the DC10, when you use the alternate gear extension lever, the outboard ailerons are unlocked (if they aren't already unlocked).

User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 30
Reply 2, posted (13 years 6 months 2 weeks 3 days 22 hours ago) and read 4118 times:

On the DC10, the outboard ailerons are normally "unlocked when the slats and or flaps are extended.

But there is another means of to unlock the outboard ailerons, and that is by extending the landing gear manually. Manual gear extension in DC10 lingo is alternate extension and is achieved using the alternate extend handle.

Without a means of lowering the flaps/slats, pulling the alternate gear extend handle will unlock the outboard ailerons (as well as drop the gear).

Interestingly the mechanism to unlock the o/b aileron uses a flap input or slat input or alternate gear handle input and so is called the "or mechanism"...really.

You're only as good as your last departure.
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2566 posts, RR: 6
Reply 3, posted (13 years 6 months 2 weeks 3 days 21 hours ago) and read 4096 times:

Following the events of that miraculous crash this may sound extremely stupid.

Why didn't the crew extend the gear earlier during their eventful descent if they thought this would give them some aileron?

User currently offlineZionstrat From United States of America, joined Apr 2001, 226 posts, RR: 0
Reply 4, posted (13 years 6 months 2 weeks 3 days 20 hours ago) and read 4091 times:

It's been a long time since I studied this one, but I think the outer aileron comment was more of a shot in the dark than a rational option. If I remember correctly, with all hydraulic systems severed there was not enough pressure to have any effect.

Of course they were dealing with a completely unexpected situation as no one thought all 3 systems could go at once, so I can't second guess them for hoping that anything might work.

User currently offlineERFly From United States of America, joined Aug 2002, 164 posts, RR: 0
Reply 5, posted (13 years 6 months 2 weeks 3 days 18 hours ago) and read 4052 times:

Zionstrat is right. They were test pilots up there. They didn't know if anything was going to work. They were just using all of their options.

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