Every 4 seconds my hydraulic pump runs for about 1/4 of a second. The plane went into the shop last week. When on jacks, with the gear up, the pump ran every 4 seconds as usually. The mechanic had me lower the gear 1/2 way. He then moved the left wheel up and down. The right wheel went down and up. He also pulled and pushed on the nose gear wheel and door. The other wheels pushed and pulled, just like you would expect. We tried the test again with the wheels up and the pump did not run. We left the plane sit with the gear up for 15 minutes and the pump did not run. I will try again today but for now, pushing the gear up and down has fixed the problem.

The problem stayed fixed on the ground. When I flew the plane yesterday, I had the same problem. The pump ran every 4 seconds and if I pulled the CB for a while, the pump ran for a while. On the ground and on jacks the problem repeated. After a few ups and downs, the problem went away again but one of my down rat trap springs broke.

Today I will be putting in pressure gauges under the passenger seat and new gear down springs to see if they can help determine what the problem is.

If anyone has any suggestions, I am all ears.

Thanks,
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Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-478-4301, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, N31161, Y47, SE Michigan