Lorn,
I have had the problem develop in the hangar too.  (and at a fly in)
Whenever I preflight, I check that the gear pump will run and develop down
pressure on the ground before taxi.  If not, I keep two wrenches in the
glove box to crack a hydraulic line with.
This works for me.

Mark Ravinski
360  1472 hrs

----- Original Message -----
From: "Lorn H Olsen" <lorn@dynacomm.us>
To: <lml@lancaironline.net>
Sent: Monday, September 21, 2009 10:33 AM
Subject: [LML] LNC2 Gear Up & Down Problems


> I have determined that the problem is caused when the hydraulic
> pressure at both switches is high enough that not only does the pump
> not run but also high enough that when the dump valve is opened the
> pressures are still not relieved to be below the pump run setting. eg.
> If I fly high and the temperature on the ground, after landing, is 60
> degrees farenheight more than the temperature in flight, the gear
> won't go up on the next flight.
>
> An EE friend of mine, after seeing our hydraulic system schematics,
> talking to Lancair and talking to Oildyne, has come up with 3
> solutions to the gear not going up and/or coming down. I am out of
> town and haven't had the chance to see the solutions. Would anyone be
> interested in a kit that solved the problem for $200 to $400.
>
> --
> Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
> DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
> LNC2, FB90/92, O-320-D1F, 1,615 hrs, N31161, Y47, SE Michigan
>
>
> --
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