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Bill1200
Joined: 19 Oct 2008
Posts: 111
Location: medford oregon
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 Posted: Sun Feb 14, 2010 11:38 am Post subject: Landing Gear Question |
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On the 52, when the gear are extended and supporting the airplane, what keeps them extended if there is total loss of air pressure?
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scgsmg(at)bellsouth.net
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| Posted: Sun Feb 14, 2010 11:45 am Post subject: Landing Gear Question |
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Down locks inside the actuators. Works similar to an air chuck. Air must be
applied to the "UP" side of the actuator for these to disengage.
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Feb 14, 2010 11:52 am Post subject: Landing Gear Question |
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over-center locking
On Feb 14, 2010, at 2:38 PM, Bill1200 wrote:
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wlannon(at)persona.ca
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| Posted: Sun Feb 14, 2010 12:58 pm Post subject: Landing Gear Question |
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Over center locking is the correct answer.
To expand on it a bit the down lock is the over center position of the drag
link (or landing gear brace). All externally applied loads toward gear up
are reacted through that structure.
To ensure it stays in that position an over-center lock is used. In the CJ6
this is an internal ball lock assembly inside the gear actuator.
I was under the impression that the Yak 52 employed an external latch
assembly on the drag link but don't know for sure so someone please let me
know. This is the typical method used on Western aircraft.
In either case this lock, or latch, is not designed to carry the down lock
loads - just ensures that the drag link is in position to do so.
Walt
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scgsmg(at)bellsouth.net
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| Posted: Sun Feb 14, 2010 1:09 pm Post subject: Landing Gear Question |
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In the -52 the gear is kept in the down position by the down-locks in the
actuators. Only the up-locks are external. Once the gear is locked down
air is required on the up side to retract.
Shane
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wlannon(at)persona.ca
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| Posted: Sun Feb 14, 2010 1:20 pm Post subject: Landing Gear Question |
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Thanks Shane;
Don't know where I got that idea. Maybe some other Yak model??
Walt
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Feb 14, 2010 1:36 pm Post subject: Landing Gear Question |
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Walter is correct. The gear-down is of an over-center design, and the
down locks are only to keep the gear from being kicked back from over
center during a bounce or what have you. The weight of the airplane is
not acting on those locking mechanisms. To pull the gear back from
over-center requires the lock to be released and the actuator pull
back on the joint.
On Feb 14, 2010, at 4:08 PM, Shane Golden wrote:
[quote]
In the -52 the gear is kept in the down position by the down-locks
in the
actuators. Only the up-locks are external. Once the gear is locked
down
air is required on the up side to retract.
Shane
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Bill1200
Joined: 19 Oct 2008
Posts: 111
Location: medford oregon
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| Posted: Sun Feb 14, 2010 7:34 pm Post subject: Re: Landing Gear Question |
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Thanks
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