Return-Path: Sender: (Marvin Kaye) To: lml Date: Thu, 21 Aug 2003 12:49:37 -0400 Message-ID: X-Original-Return-Path: Received: from pony2pub.arc.nasa.gov ([128.102.31.42] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2536485 for lml@lancaironline.net; Thu, 21 Aug 2003 12:08:00 -0400 Received: from [143.232.221.83] ([143.232.221.83] verified) by pony2pub.arc.nasa.gov (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2134615 for lml@lancaironline.net; Thu, 21 Aug 2003 09:07:54 -0700 Mime-Version: 1.0 X-Sender: mreinath@mail.arc.nasa.gov X-Original-Message-Id: X-Original-Date: Thu, 21 Aug 2003 09:07:49 -0700 X-Original-To: lml@lancaironline.net From: "Mike S. Reinath" Subject: [LML] LNC2 and Legacy gear Content-Type: text/plain; charset="us-ascii" ; format="flowed" << 1) if you note the hyd pump light blink in-flight or hear the hyd pump for a sec when you turn the master on, you have a leak... >> Don't forget about the effect of ambient temperature on the system pressure. If I pressurize the down circuit in the afternoon when it's 90 degrees F, in the cool of the next morning the pressure will be near zero. I can watch the pressure climb back up to 500 -- I have pressure gauges on my panel -- as the ambient temperature climbs back to 90. Same thing goes for raising the gear when it's hot down low and climbing to a high altitude for a long cross country where it's significantly cooler. Typically, my high pressure will start out at about 1200 psi. After about an hour at 12,500 ft, the high pressure may be as low as 800 psi, and the pump may come on once to bring the pressure back up -- I've noticed that the pressure-switch hysteresis can be quite large when the pressure decreases slowly like this. I have no leaks in my system. The pressure will hold for days at constant ambient temperature. Mike Reinath N3602M Std. Build 360