| I can set my plane on jacks for days and have no pressure leak. I can fly for hours and have no pressure leak. But if I fly high, where it is cold, every hour the pump will run for 1/2 of a second (about 300 lbs). The reason for this is that the high pressure side has leaked about 300 lbs of pressure to the low side (or gone done because of the temperature). Most of the time that I fly high for more than 3 hours, the low pressure side has increased enough to stop the pump from running when I put the gear lever down. At this time, I open the dump valve for just a second. The pressure in the low side goes down and the pump comes on.
I believe that our activators leak more when cold. Or, it could be that the high pressure side gets so cold that it needs more pressure and the low side also takes the pressure without relief? -- Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp. LNC2, FB90/92, O-320-D1F, 1,300 hrs, N31161, Y47, SE Michigan
|