PHCarter(at)aol.com
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 Posted: Mon Jan 15, 2007 7:52 pm Post subject: Cowling T-Slot Bushings |
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Folks
The upper cowling of my Yak-52 has been chaffing with the forward fuselage resulting in cracks and general deterioration of the rear edge near the canopy wind screen. I recently found out from a local expert that the upper portion of the cowl is supposed to be supported by the lower cowl and that the lower rear support of the cowl is adjustable in order to make sure the upper cowling shell clears above the fuselage and does not rest upon it. I have noticed a number of -52's with raged rear edges on their upper cowling shells. This lead me to believe that this was just the way the design worked. My mechanic pointed out how the rear support adjustment works and pointed out I was missing some parts. After reviewing the Yak-52 parts catalog I got with the plane, it appears I am missing the T-slot bushings that normally go on either side of the cowling mounting points. There are four T-slot bushings all together. A previous owner must have lost these bushings and tried to safety wire this adjustable mount into an acceptable position. It didn't work. With time, vibration and air loads push upon the cowling, the adjustment dropped down and makes the upper cowling shell rest upon the fuselage.
I need four T-slot bushings for my cowling mounts. Does anyone have some? I will try the normal places, but I will be surprised if they have them in stock. If any one has one, can you make a drawing and email it to me. I will make some if I have to. If anyone has just one (damaged or otherwise) I can use it to make new ones.
Since I have seen other -52's with raged cowling edges, I wanted to tell folks of my experience / discovery. If others have missing T-slot bushings (they look easy to lose) and we can't find a supply, I will make some extras for others or we can find a replacement method.
By the way, the Russian design for the adjustable mount is quite good. It is very practical and easy to adjust. The only flaw, it appears, is the T-Slot bushings can fall off and get lost if one is not looking.
Preston Carter
Yak-52, N6209F
phcarter(at)aol.com (phcarter(at)aol.com)
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