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Bob,
I don't have the main gear drawing that you are looking for, but I do have
some pictures of the down lock and components. The spring force holding
the down lock pin in the down position is a series of Belleville washers.
Last July, on take off, down lock pin, retaining cup, and washers
ejected from the right cylinder. There was no damage to the circlip or the
retaining groove so I can only assume the circlip was not
originally installed properly. I have no idea why it lasted
150 hours and then decided to let go. I found all of the parts, less a few
of the washers, in the wheel well after landing. I'll send you the
pictures off line because of the file size. If anyone else wants them just
let me know.
If you hear a loud POP during gear retraction, and it doesn't sound the
same as the gear doors closing, and your hydraulic pump keeps running, and your
flaps wont retract, I would suspect the down lock pin exiting the gear cylinder
is a possibility. The emergency hand pump still works just fine.
There is enough fluid in the reservoir below the electric pump pick up
point. Keep in mind that the down lock pin is gone so the bleed through in
the system along with the airflow against the gear in the down position is
enough to make the offending gear move off of the full down position and the
gear light may start winking at you on final so be ready to give it a stroke or
two on short final. Maintain full aft elevator after landing and be easy
on the brakes to avoid having the offending gear leg roll over center and
collapse.
Ken Kellner
LOBO Member
IV-P N14LK
----- Original Message -----
Sent: Saturday, June 18, 2011 8:15
AM
Subject: Door Seal on the IV-P
Gentlemen,
I
just completed the third condition inspection on N437RP at 680 hours TT. The
airplane is in excellent condition; I found no cracks or structural problems
at all, but could use some help with two issues.
If
anyone has a breakdown drawing of the main gear actuator for the IV/IV-P, I’d
really like to have a copy. My right main gear actuator has developed a small
hydraulic leak around the downlock pin that sticks
out of the top of the actuator base. I constructed the airplane with a
removable top to the wheelwell, so I can stand up in
the wheelwell and access the rear of this actuator,
but the space is tight. I suspect the downlock pin
is held down by a rather strong spring, so removing the circlip that retains the assembly without a clamp or tool
would probably result in not being able to reinstall it. If you have any
experience with servicing this seal, or removing the whole actuator, I’d
appreciate any advice.
Second
problem: I have a small pin hole in the “sidewall” of my door pressure
seal. It’s so small that the seal will retain pressure for a short period,
causing the pressurization pump to cycle on every few seconds. I would like to
hear from anyone that’s tried to
patch such a hole.
Many
thanks in advance,
Bob
Pastusek
757-286-4802
cell
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