Thanks Chris.
At lunch I looked over your excellent report on the 320/360 and Legacy hydraulic systems. We have the pre-2005 Legacy hydraulic pump we’d modified for
28 VDC and changed to the high capacity pump. I’d never heard anything from Lancair about a change in the internals as you described it – symmetric spool, spool centering springs, 150 psi backpressure circuit removed, etc.
Of course we have the three way dump valve to handle the hydraulic cylinder rod retraction/extension on dump valve activation. But, it seems everything
thing else must be 320/360 type internal on the spool and backpressure circuit.
I’m not sure what changes we should make, if any, to have a system that isn’t prone to these pressure lock ups with temperature changes… Suggestions?
I think William Ford’s Legacy kit number is close to ours so he likely has a similar setup…
Thanks again,
Valin Thorn
Legacy Project
Boulder, Colorado
From: Lancair Mailing List [mailto:lml@lancaironline.net]
On Behalf Of Chris Zavatson
Sent: Monday, April 21, 2014 9:44 AM
To: lml@lancaironline.net
Subject: [LML] Gear Down...INOP
My email has been bouncing LML messages recently. I saw your question on the archive list.
The above describes the extension failure mode in a 320/360. I haven't studied the Legacy system relative to this failure mode -may or may not be applicable. Do you
have pressure gauges? The readings during gear extensions and especially during this failure would be most helpful in identifying the cause.