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Wanted clever PA32 engineer's thoughts - Gear extention problem on Piper Lance
Others may be able to give more knowledgeable advise, but I am somewhat
familiar with the gear system on the PA28R, and I believe the system on the PA32R is similar. As I see it, you have expressed two problems. The first is that the gear won't extend reliably with the normal hydraulic activation (accompanied by the squeal from the pump). The second, potentially more dangerous problem is alluded to at the end of your post when you state, "however once released with the emergency extension lever the hydraulic pump would push them to the locked position if required." The whole idea of the emergency extension system, which is essentially a valve that releases the hydraulic pressure holding the gear up and thus allowing it to free-fall into the extended (and locked!) position, is that it works independently of both the pump and the electrical system. Your statement seems to suggest that the gear will free-fall, but may not lock unless given a "boost" from the pump. Bad situation if you ever loose your pump! This second problem may in fact be related to the first problem. If you can figure out why the gear does not reliably free-fall to a down and locked position, you may also find the reason why the hydraulics won't reliably extend the gear down. Once place it start looking would be the pressure switch, which is common to both the main hydraulic circuit and the emergency bypass circuit. One more thing: I do not believe it is normal for the pump to squeal, even momentarily, at the end of the gear cycle, since the pressure switch should cut it off immediately when pressure spikes upon full extension, but I could be wrong. Anyway, this would also point to the pressure switch as the culprit. I presume your mechanic has checked to make sure the system is purged of air and is not leaking. Hope this might be of help. Good luck. -Elliott Drucker |
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