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This looks like a relay that when it senses the Hi pressure switch being open, while the gear is up, shorts and closes the Lo pressure circuit. This will bypass the Lo pressure sensor when the sensor opens from the hydraulic fluid expanding. This type of fix does not stop the hydraulic fluid from expanding more and more as it heats up. The hydraulic fluid expansion can damage the hydraulic system. I have monitored this problem and have seen the Lo side exceed 2000 psi during this heat expansion in the summer months.
If this relay sticks the Lo sensor circuit will be on all the time regardless of the pressure sensor.
The ONLY way to approach this work around for the Oildyne pump problem is to REMOVE the pressure from the Lo side. Relieving the expanding hydraulic fluid and put it back in the reservoir where it belongs!!!!
This type of "Fix" that simply bypasses the open Lo sensor and does not relieve the expanding hydraulic fluid is insane and it's a ticking time bomb for gear failure!!!
Randy Stuart
LNC-2
----- Original Message ----- From: "Lorn H Olsen" <lorn@dynacomm.us>
To: <lml@lancaironline.net>
Sent: Monday, October 19, 2009 6:18 AM
Subject: [LML] LNC2 Hydraulic Gear Operation Fix
A module to fix the gear operation failure problem in the LNC2 using
the standard hydraulic system is now available.
The problem occurs when thermal expansion has caused both HI and LO
pressure switches to trip rendering the landing gear hydraulic pump
incapable of operating.
This module will activate the hydraulic pump motor in the direction
selected by the gear switch when both pressure switches have been
tripped by high pressure thereby relieving the pressure in the
offending side.
The module is 2.5" x 1.5" x .75", weighs 2.3 oz. and has two pairs of
leads that connect directly to each pressure switch with 1/4" spade
terminals. No other wiring is necessary. Price is $250.00 each. Simple
installation instructions included.
Contact Wolfgang at 248-471-2000 or Wolfgang@MiCom.net
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Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,650 hrs, N31161, Y47, SE Michigan
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