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To:  lml@lancaironline.net
Date: Mon, 11 May 2009 20:23:52 -0400
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From: "Giuseppe Sozzi" <giuse.so@tiscalinet.it>
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Subject: Re: LNC2 Nose gear door
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Disposition-Notification-To: "Giuseppe Sozzi" <giuse.so@tiscalinet.it>

Yes, I checked the valve and I'm sure at 100% it isn't actuate before the 
gear is up.
The valve is installed as the drawing in the plan.
I'll hook up a pressure gauge to check if there is a leacking and the 
pressure value.
Thanks

Giuseppe Sozzi


----- Original Message ----- 
From: "John Cooper" <snopercod@citcom.net>
To: <lml@lancaironline.net>
Sent: Sunday, May 10, 2009 11:55 PM
Subject: Re: LNC2 Nose gear door


> Yes, I had a similar problem, and it was because fluid was leaking past
> the ball-check in the sequence valve. I replaced the valve and that
> fixed the problem.
>
> It almost has to be the sequence valve, because for the door to close,
> hydraulic fluid must pass through the sequence valve to the door
> cylinder. Either the valve is leaking though, or it is being actuated
> before the gear is up. My guess is that your replacement valve is
> leaking just like the old one did. All it takes is a little speck of
> dirt to get stuck under the ball-check valve.
>
> These sequence valves are basically just a check valve which block the
> flow of fluid in one direction until the ball is mechanically pushed off
> the seat by the plunger. There's a spring under the ball which normally
> holds it against the seat.
>
> There should be no pressure on either side of the door cylinder while
> the gear is coming up until the nose strut actuates the sequence valve.
> To find out, you could remove the hydraulic line from the door cylinder
> and see if any fluid is leaking out with the sequence valve plunger
> removed so it can't actuate when the gear is up. Either that, or hook up
> a pressure gage.
>
> May we assume that the sequence valve is installed in the correct 
> direction?
>
>