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From: "GT-Phantom" <gt_phantom@hotmail.com>
Date: October 15, 2008 1:40:30 AM GMT-04:00
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Questions:
- Can anyone verify (or refute) my theory about the rapid switch cycling at full extension / retraction? If not check valves, solution?
Some valve or actuator is leaking.
- Does anyone know of a good way to completely purge the system of air?
I have had my pump out a couple of times and never even thought about air.
- Has anyone determined conclusively that the "recommended" pressures of 1100/550 simply AREN'T enough?
These pressures are absolutely high enough.
- How high is safe for the system if I go up on either of the pressure switches?
Don't go higher. The gear should go down with 0 pressure and up with 500 to 700.
My prior plane was a 235 with a virtually identical system (I did not build either one) and, although it might cycle once or twice at the end of the retract cycle would then immediately be quiet (although on a very long flight it might "burp" once or twice in the up direction to maintain up pressure).
Every hour that I fly, my pump burps. Any more and you have a leak.
All help appreciated!
Cheers,
Bill Reister
As a side note, not having anything to do with your problem, the temperature change at altitude or overnight can change the pressure in the system by up to 1,000 lbs.
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,489 hrs, N31161, Y47, SE Michigan
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