X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 09 Jun 2013 17:34:48 -0400 Message-ID: X-Original-Return-Path: Received: from mail-vb0-f45.google.com ([209.85.212.45] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6315230 for lml@lancaironline.net; Sat, 08 Jun 2013 21:30:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.212.45; envelope-from=dballin@gmail.com Received: by mail-vb0-f45.google.com with SMTP id p14so1373036vbm.32 for ; Sat, 08 Jun 2013 18:29:54 -0700 (PDT) X-Received: by 10.58.75.41 with SMTP id z9mr2453586vev.4.1370741394229; Sat, 08 Jun 2013 18:29:54 -0700 (PDT) MIME-Version: 1.0 Received: by 10.220.200.4 with HTTP; Sat, 8 Jun 2013 18:29:34 -0700 (PDT) Reply-To: dballin@gmail.com From: Dan Ballin X-Original-Date: Sat, 8 Jun 2013 18:29:34 -0700 X-Original-Message-ID: Subject: Hydraulic Issue X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=089e012942aae1d11d04deae99e3 --089e012942aae1d11d04deae99e3 Content-Type: text/plain; charset=ISO-8859-1 For all those pump experts out there: I flew my Legacy down to Monterey few days ago (Thanks to Ralph Love for being such a gracious host). I noticed that my up pressure got to 2000psi, I assume due to heat, it was warm. I cracked the dump valve and it was back to the usual 1500. No issues on the low side when the gear was down - usual 600psi or so. Today flying back to Bend, took off out of Gnoss field about 105 on the ground. In cruise at about 14,500, I noticed the up pressure was about 1200 and would slowly drift down to 900 at which point the pump would come on for less than a sec. Seemed like it cycled like this about 4 or 5 times in the 2 hr flight. So I assume I have an internal pump or dump valve leak and I haven't tried to investigate, but wonder what people thought. Note that I, unlike a number of you, haven't had this issue before. Could the pressure spike have done something? blown a seal?? How would you go about sorting it all out. Thanks Dan Ballin N386DB LEG2 --089e012942aae1d11d04deae99e3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
For all those pump experts out th= ere:

I flew my Legacy down to Monterey few days ago (Thanks to= Ralph Love for being such a gracious host).=A0 I noticed that my up pressu= re got to 2000psi, I assume due to heat, it was warm.=A0 I cracked the dump= valve and it was back to the usual 1500.=A0 No issues on the low side when= the gear was down - usual 600psi or so.=A0 Today flying back to Bend, took= off out=A0 of Gnoss field about 105 on the ground.=A0 In cruise at about 1= 4,500, I noticed the up pressure was about 1200 and would slowly drift down= to 900 at which point the pump would come on for less than a sec.=A0 Seeme= d like it cycled like this about 4 or 5 times in the 2 hr flight.

So I assume I have an internal pump or dump valve leak and I have= n't tried to investigate, but wonder what people thought.=A0 Note that = I, unlike a number of you, haven't had this issue before.=A0 Could the = pressure spike have done something?=A0 blown a seal??=A0 How would you go a= bout sorting it all out.

Thanks

Dan Ballin
N386DB=A0 LEG2
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