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uplock actuator
Just finishing my annual inspection on my 337A. During the gear swings, at the end of the gear up cycle, we could hear a loud squeak or squeal when the uplock actuator engaged. The sound seems to be coming from the actuator itself and not the associated linkages which incidentally were all lubed. My A&P/AI has a lot of 337 experience both working on them and flying them (he has owned two of them himself). He has never run into this issue. The actuator is not leaking and operates normally except for the sound. When the uplock actuator releases the uplocks on the gear down cycle, it does not make the sound. It only does it when it engages the uplocks at the end of the "up cycle". We then tried retracting the gear with the emergency hand pump and the actuator did not make the sound when it engaged. It only does it when using the mule to cycle the gear. The mule we are using was made using the electric/hydraulic pump from a Cardinal RG. I have owned the aircraft for three years so this is the third annual we have done using this same mule for the gear swings so the mule pressure would not seem to be the issue.
Hoping someone out there has run into this issue or at least has some ideas concerning it.
Burt
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