Unfortunately, I can't give a definitive answer. I have a couple of
questions and suggestions.

I can't figure out what is meant by 'an abnormal amount of play', in the
problem description. Where is the play? Does he mean that you can move the
handle and nothing happens? Or are the rod ends worn, and you can rattle
the flaps when the handle is in the flaps-down position? Or does he mean
that you can shift the big tube left and right, if you push on it?

Has he examined the tube to see what provides for the left-and-right 'thrust
load? In other words, what keeps the tube from shifting left or right? I
know what you mean about the 'missing cotter pin', but the IPC and Shop
Manual are both rife with errors. For example, if you note the figure
number for the pins (#40), it shows them in two places. But if you check
the parts list, it only shows a quantity of one per assembly. That may mean
that one was omitted in design at some point, and the IPC went uncorrected.
Or it may mean that there is only one used, and it can be placed in the
right or left side of the tube. If he figures out what is taking care of
the thrust loads, that will answer the question of whether the pin is
relevant to the rubbing issue.

Has he examined the flap on the 'rubbing side', to see whether the flap is
actually shifting inboard? There were a couple of different
bushing/fastening systems used on the flap pivots. One of the earlier
systems allowed the flap to shift inboard, and sometimes outboard (into the
aileron) when deployed. There is a Service Instruction that addresses it,
downloadable on BAC. I just don't have time right now to look it up for
you. It calls for installing the later style of bushings that better
'capture' the flap brackets.

If the flap control tube isn't shifting left or right, the tube isn't the
problem. If the flaps are snug in their brackets, and can't shift inboard
or outboard (when up or when deployed), then they aren't the problem
(assuming they are in the right place to start with). If this is the
situation you end up with, why not just put a standard (aircraft hardware)
washer (or two) between the rod end and the actuating bracket, to very
slightly space the rod away from the bracket? If this results in too few
threads showing on the bolt beyond the nut, or it causes the rod end to bear
on threads rather than shoulder, on the bolt, the next size longer bolt is
needed.


_____

From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
On Behalf Of Gary Percy
Sent: Tuesday, June 20, 2006 9:42 PM
To: musketeermail@yahoogroups.com
Subject: [musketeermail] Flap Control Play

I'm done with my annual except for one thing that is bothering the
IA. This is the first time I've used this guy, but he comes
recommended, and keeps a fleet of air ambulances in the air, but is not
too familiar with Musketeers, tho he recently did an annual on a Mouse.

He found, what seemed to him, an abnormal amount of play in the flap
control. At the end of this post, I have posted link to a photo I took
out of my parts manual to make it easier to describe what I am talking
about. If you look at the photo, you will see two cotter pins that I
have red arrows going to. The cotter pin on the left is not there.
There is not even a hole for the cotter pin. Never has been. When the
flaps are operated, it causes the rod I've labeled ROD with an arrow
pointing to it, to rub against the end of the shaft, labeled 20 in the
drawing. It does not seem to be causing any real wear on the shaft or
the rod, but he is concerned because it is a flight control. He is
looking into it, but I thought I'd post the question here.

1. For those that are real familiar with this control, is this rubbing
of the rod and shaft a concern?
2. Since there is no hole for cotter pin #1 in my photo of the drawing,
do I have a concern?

It is a A23-19, Serial number MB-73.

http://i.pbase.
<http://i.pbase.com/o4/64/209564/1/62...rol01_6483.jpg
> com/o4/64/209564/1/62211912.1fn6cldZ.flap_control01_6483.\
jpg

Gary
http://www.harborsi
<http://www.harborside.com/~gpercy/musketeer/musketeer.htm>
de.com/~gpercy/musketeer/musketeer.htm
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