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Date: Thu, 26 Feb 2009 10:45:42 -0500
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From: gerardoconnell@optusnet.com.au
Subject: Re: [LML] Re: Legacy Gear Retraction Problem

yes you can get a sequence valve re build kit from lancair at minimal cost


> ASW20747@aol.com wrote:
> 
> Dan:
>  
> Yes the hydro press on the gauge fluctuated, in synch with the gear as  
> it 
> "chattered" on the way up. This happened at the original 1,100 psi 
> setting  and 
> the temporarily boosted 1,425 psi setting.
>  
> Also, in a previous post, Scott/GrayHawk suggested a sequencing valve  
> overhaul may be in order.  Has anyone else had to overhaul or replace a  
> gear door 
> sequencing valve?
>  
> Thanks for the help and advice!!
>  
> Erik
>  
> Legacy
> N74FX
>  
>  
>  
>  
>  
>  
> Interesting problem. Did you happen to measure the hydro pressure at the 
>  
> higher setting (or normal) while cycling? In other words, does the hydro 
>  
> pressure remain constant throughout the cycle or does the pump pressure 
> drop off  
> through the cycle? 
> Regards, 
> Dan  
> Sent from my Verizon Wireless BlackBerry 
>  
> ____________________________________
> From: asw20747@aol.com
> Date: Wed, 25 Feb 2009 08:11:45  -0500
> To: <lml@lancaironline.net>
> Subject: [LML]  Legacy Gear Retraction Problem
> 
> We have come up with an interesting problem while doing a recent  
> annual.  
> Was wondering if anyone might have some ideas?
>  
> Background:
>  
> We have a well built and well maintained Legacy that has been flying for 
>  
> about 2 years with just under 300 hrs on it. We are doing the (second) 
> annual  
> inspection and on the gear swing found that the nose gear retracts 
> first, then  
> the left main followed by the right main.  When the right main went up 
> it  did 
> so it with a chatter or shudder, most noticeable, at first, with the  
> inner 
> gear door.  In other words, it went up but not smoothly like the  other 
> gear or 
> as it has ALWAYS done in the past.
>  
> In an attempt to trouble shoot the problem we disconnected the inner  
> gear 
> door and checked for ease of movement, binding etc..  All was  perfectly 
> smooth 
> with no binding or resistance of any kind.  We then  retracted the gear 
> without the inner door connected.  We still notice a  consistent chatter 
> in the 
> right main AND in the inner gear door actuator  cylinder, moving without 
> the inner 
> gear door attached.  We then took the  sequencing valve out of the 
> picture by 
> using a piece of doweling pushed up on  the sequencing valve as the main 
> gear 
> retracted (inner door was  still disconnected) and now noticed a smooth 
> operation of the gear and  the inner door actuator.
>  
> We have checked that the sequencing valve makes good solid contact with 
> the  
> gear. We checked the up side hydro pressure and it was 1100 psi. We ran  
> this 
> problem by Lancair technical (Ross) and he suggested we bump up  the 
> hydro 
> pressure to not more than 1,500 psi up to see if that made any  
> difference.  We 
> boosted it temporarily up to 1,425 psi  nd  there were NO changes.
>  
> Does any one have an idea of what may be going on?  We have  considered 
> air 
> in the system but with no leaks and the system operating for  quite some 
> time 
> with no problems and many cycles, would air in the system still  be a 
> possibility?  How about the sequencing valve, seems pretty simple,  they 
> either work or 
> they don't, could that be an issue? Since we have been  involved in this 
> 
> problem the issue has been consistent, never intermittent, and  never 
> involved the 
> other gear.
>  
> At this point ANY ideas or suggestions would be GREATLY  appreciated.   
> 
> Erik
> 
> Legacy  
> N74FX
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