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Rellihan
08-30-2005, 07:38 AM
Bob knows this well, but as a reminder for those less experienced....

If you use the tail-down method, whether a weight, tail stand, or tie-down anchor, take care with how you get the tail down. Unlike the wing rings, the tail ring is aluminum alloy. The associated structure is designed to handle primarily vertical loads on the ring. It can be damaged by being yanked side-to-side or fore-and-aft with too much vigor or at too wide an angle. In fact, though it is widely ignored, there is a caution in one of the manuals against using the tail ring to pull the plane around. It clearly has to hold the plane against wind loads, and isn't exactly fragile, but just exercise care.

A related concern is the Stabilator spar and internal structure. There were some cracking problems with the original early sixties internal structure design, and the structure was beefed up a bit in subsequent versions. There are cautions in the manuals against any significant lifting or pushing down on the Stabilator. One of the preflight tasks is to gently move the tip of the Stab up and down. This is to check for loose pivot bearings or brackets, but is also to detect any cracked structure by hearing "oil can" or popping noises or excessive play. If you must press down on the Stab, the safest place to do it is right above the pivot bearing, up against the fuselage. Never let a helper push down or pull up anywhere else on the Stabilator. An over-eager friend can do a tremendous amount of expensive damage on a plane.

----- Original Message -----
From: Bob Swaim
To: musketeermail@yahoogroups.com
Sent: Tuesday, August 30, 2005 8:03 AM
Subject: [musketeermail] Re: Nose wheel stuff


I've seen ceiling and engine lifts used successfully, but it's sure
easier to just pull the tail down with a concrete block. You also
won't then have to maneuver around the hoist or worry about the
mounts. Just make sure the block & attachment (use chain!) is heavy
enough if people get in the cabin or lean on the engine! Long ago,
I got to see an incident in which a Mooney tail was put through the
ceiling during a gear swing check.
Bob
A&P, Aero Eng

--- In musketeermail@yahoogroups.com, "Al ODonnell"
<sundowner6699x@y...> wrote:
> Group,
>
> I saw the wooden brace someone used on BAC photo to hold up the
front
> of the plane while working on the nose wheel and or donuts. I
have a
> friend in the next hangar who has a portable auto engine lifter.
It is
> use to take car engines out of cars. Can anyone see any reason I
could
> not use this to hold up the front of the plane while working on
the
> nose gear?
>
> Thanks
>
> Al




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jkaidor
08-30-2005, 08:20 AM
> Bob knows this well, but as a reminder for those less experienced....
>
> If you use the tail-down method, whether a weight, tail stand, or tie-down
> anchor, take care with how you get the tail down.

*** Or, better yet, don't use the tail-down method at all. Why do you
need to? You can raise the nose perfectly well with a scissor jack
under the nose gear per the Beech manual.

A "perfect" scissor jack can be made by putting a pad of epoxy putty
on top of an ordinary jack. Then put some plastic wrap on top of the
putty. Then you put the jack under the gear and raise
it gently until the putty smooshes in. Fifteen minutes later, the putty
is hard as a rock, and you have a jack with a top that exactly matches the
gear.

Of course, if you want to do any serious work, you then need to support
the nose with something better than a jack. Fabricating a cradle for the
firewall is a bit more of a project than one can describe in a short
email. Check the BAC & MM archives!

The only lifting equipment I am lacking at this time is something for
the wings. Anybody know if they can be supported with a pair of
plywood/carpet cradles? Or are the Beech jack pads the best bet?

- Jerry Kaidor ( jerry@tr2.com )


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