steveadams
Joined: 10 Jan 2006
Posts: 191
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 Posted: Thu May 15, 2008 6:10 am Post subject: 640 Carb Heat |
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Every time I find a maintenance issue, I try and post it for those few 640 builders out there. The other day I was landing and pulled the carb heat, which pulled about 6 inches out of the panel. I landed, and thinking the cable had broken, removed the cowl to take a look. I didn't take any pictures, but the bolt attaching the cable to the arm that controls the carb heat flapper had worn all the way through the arm and pulled out. On closer inspection, the bolt had also been worn so only about 30% of the bolt cross section was remaining. The bearings that the flapper rod passes through were also worn out. I replaced the flapper arm, flapper rod, and bearings (Aircraft Spruce part number 07-00110) so I could keep flying, but am looking at the design and trying to come up with a fix. I think I will weld on a thicker and wider arm so I can drill a larger hole and insert a bearing around the bolt which should make it hold up a bit better. The cabin heat uses a similar design and control cable, but there is no wear at that connection.
Steve Adams
Steve Adams
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