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From: Robert R Pastusek <rpastusek@htii.com>
To: Lancair Mailing List <lml@lancaironline.net>
Subject: RE: [LML] Re: Gear Strut Compression Tool
Thread-Topic: [LML] Re: Gear Strut Compression Tool
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Date: Mon, 8 Apr 2013 02:20:32 +0000
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Dennis wrote:

I know this might not work in a Lancair IV, but in my Legacy, I do an alter=
nate gear extension test in flight, using gravity and the gas shocks, to co=
nfirm that I get three down and locked.  If it works, I don't think there i=
s any need to remove the gas shock and test it.


Dennis,
As designed by Lancair, the IV/IV-P mains will "free fall" to a trail posit=
ion when the "up" pressure is removed from the gear retraction cylinder. Th=
ey will not fully extend and lock down because they have to move forward ag=
ainst the airstream. Because of the design, there is no reasonable way to a=
ttach a gas strut to assist this, although some folks have devised various =
alternative "automatic" extension systems. The Lancair solution was to moun=
t an emergency pump between the front seats to pump the mains down. Works w=
ell in all situations except some broken/leaking hydraulic line emergency s=
ituations. The reservoir even has a pick up for the emergency pump that is =
lower in the tank so there is some fluid left after the electric pump start=
s sucking air.=20

The IV/IV-P nose gear is extended by a gas strut just like the Legacy, and =
should extend and lock down any time the "up" pressure is removed from the =
nose gear retraction cylinder. Part of the recommended condition inspection=
 is a flight test to confirm that it will extend at or above 120 KIAS when =
the hydraulic pressure is depleted--(and that you can also pump the mains d=
own and locked). My nose gear will extend and lock down reliably at 140 KIA=
S so I have not removed and tested it with a bathroom scale as recommended,=
 but I'm thinking that this year is probably time to do so...

My two cents...

Bob=20