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Date: Thu, 15 Dec 2005 12:30:29 -0500
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Subject: [LML] LNC2 Nose Gear Door Goofy
Thread-Topic: [LML] LNC2 Nose Gear Door Goofy
Thread-Index: AcYBnPYJ+f/2x0CiSLqhdXnRapeArA==
From: "Metcalfe, Lee, AIR" <Lee.Metcalfe@jocogov.org>

The nose gear door on my 320 has started this strange behavior of
gradually moving towards the closed position over a period of days with
plane in the hangar.  I think the design of the system is per the
Lancair build manual.  Only the up side of the actuator is plumbed into
the hydraulic system.  The down side is open to the atmosphere and
down-force is supplied by a "coil-over" spring on the actuator.  The up
side hydraulic line goes through a sequence valve actuated by the gear
being fully retracted.  The only thing I can think of is the sequence
valve is leaking pressure to the actuator, but where would that pressure
come from?  Isn't the up side of the system depressurized in the
gear-down mode?  Is down side pressure leaking to the up side somewhere?

By the way, the cause of new noise in the nose gear tunnel I wrote about
last week was indeed the panel on the nose gear strut that covers the
firewall opening when the gear is retracted, as Grayhawk had guessed.
The hose clamp that holds it in position had come lose and the panel was
"flapping in the breeze!'

Lee "Moondog" Metcalfe
N320WH - Kansas City