Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Mon, 18 Nov 2002 22:34:09 -0500
Message-ID: <redirect-1881592@logan.com>
From: "Larry Henney" <lhenney@dellepro.com>
Subject: RE: [LML] LNC2 Hydraulic Spool Valve in Backwards
Organization: American Airlines
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In-Reply-To: <list-1881026@logan.com>

Mike,

I did your test today.  I've had Lorn's 4 second clackety clack a couple
years ago.  A couple other spurious / erroneous faults in my hydraulic
system had never produced a culprit behond adjusting the up / down
pressure switch set screws (except the free fall valve which has been
replace).  

Anyway, I saw 4 seconds the first time and 8 seconds the second time I
did your test.  I get the impression I am one of the many that have my
spool valve installed backwards.  

Please tell me it's a no brainer to reverse it on my work bench.  Would
love to here the gory details.  Spare no text as I am a bear of a wee
little brain.

Larry Henney 
N360LH LNC2 IO-360 B1
16XS  Ft Worth, TX

> I've posted this before: A simple test to check if your spool valve 
> is okay is to put the plane on jacks and raise the gear. With the 
> gear 95% up, put the switch back in the down position. The pump 
> should stop and reverse immediately, and the gear should start back 
> down. If the pump just stops and then delays before reversing, then 
> the spool valve is probably in backwards. Depending on the pressure 
> switch settings, and the low-side pressure relief-valve setting, the 
> delay may be a few seconds to maybe 10  or 20. In my case, it was 
> closer to 20.
>