GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Mon Jan 04, 2010 11:31 am Post subject: AG5B throttle cable |
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I had to change a throttle cable on an AG5B this weekend. Changing the throttle cable should not take 2 hours.
I've never been a big fan of the AG5B. Too many DUMB design decisions went into the plane. The throttle quadrant is an example. While changing the throttle cable, I came up with at least 3 different ways it could have been done to make it easier to service. But, as with most things on the AG, maintenance was not a priority.
For those of you who haven't seen it:
All three cables, carb heat, throttle, and mixture are held in place in the same bracket with the same piece of aluminum (aluminum retainer). So, to remove one, the aluminum retainer (that holds all three in place) needs to be removed. Not a big deal, really, if everything stayed in place.
The bracket that the cables lock into:
The bracket has 3 vertical slots, 1.5 inches apart, 1/2 inches long/deep, with a notch at the top: 2 towards the left side of the bracket and one toward the right side of the bracket. That's only part of the problem. You see, when holding everything so the aluminum piece that holds them in place can be installed, one needs to figure a way to hold them in their respective corners.
The aluminum retainer: it's about .060 thick, I didn't measure it. It has the same slot spacing as the bracket but, no notch at the top. It's purpose is to hold the cable into the notch in the bracket. Problem is . . .
Putting the retainer in place requires that all three cables be pulled tight into the notch; understandable since we really don't want any movement in the cables. But, getting it together is a real pain in the ass. I was able to get one side in, then, pulling the center cable (the throttle cable) into place and getting the retainer started into that position pulls it out of the end slot (pivots on the cable), I could get the other end started, then it would pull out of the first end completely, then . . . . I tried many attempts. Then, I filed the edge of the retainer slots at the top so that it could tuck under the cable and lock in place. It worked a little. I was able to get it started on all three. It's an extremely tight fit. There is really nothing to push against. The entire cable support bracket moves when pushed on from the bottom. I got some channel locks and tried to squeeze it together. I thought I had it when one end came out. I broke the retainer in the middle.
Fortunately, the Project plane was there to donate it's retainer. After carefully filing the corners of the slots, I worked that retainer into place. Two hours upside down in a Tiger.
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Gary
AuCountry Aviation
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