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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