X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 17 Jun 2009 18:45:57 -0400 Message-ID: X-Original-Return-Path: Received: from mail-out2.fuse.net ([216.68.8.171] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3685461 for lml@lancaironline.net; Wed, 17 Jun 2009 09:56:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.68.8.171; envelope-from=dreagan@fuse.net X-Original-Return-Path: X-CNFS-Analysis: v=1.0 c=1 a=7y-PJpYwLlYA:10 a=Ia-xEzejAAAA:8 a=izasK-duOP0__SXeCUAA:9 a=t32baXbz4J-fzTU00WnfWfMM0DoA:4 a=EzXvWhQp4_cA:10 a=1oqGTYSLAAAA:8 a=03N45bRq4TH0HxpkCHsA:7 a=tHexdQlBUbCA6NxvGCG1Xqfd7vcA:4 a=cvn8laQl214A:10 X-CM-Score: 0 X-Scanned-by: Cloudmark Authority Engine Authentication-Results: gwout2 smtp.mail=dreagan@fuse.net; spf=unknown Received-SPF: error (gwout2: 208.102.196.40 is neither permitted nor denied by domain of fuse.net Received: from [208.102.196.40] ([208.102.196.40:50064] helo=D45LWMF1) by gwout2 (envelope-from ) (ecelerity 2.2.2.37 r(28805/28810M)) with ESMTP id 7C/8F-09581-4F5F83A4; Wed, 17 Jun 2009 09:56:05 -0400 X-Original-Message-ID: <003001c9ef53$3ce1e110$fdc8a8c0@D45LWMF1> From: "Dan Reagan" X-Original-To: , "Jeffrey Liegner, MD" References: Subject: Re: Continuous running hydraulic pump X-Original-Date: Wed, 17 Jun 2009 09:55:13 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002D_01C9EF31.B5A7AA70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 This is a multi-part message in MIME format. ------=_NextPart_000_002D_01C9EF31.B5A7AA70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: Continuous running hydraulic pumpMy flaps retain pressure on the = ground when left in the down position. They bleed off in the nuetral = position. Dan Reagan IVP 650 hrs. ----- Original Message -----=20 From: Jeffrey Liegner, MD=20 To: lml@lancaironline.net=20 Sent: Tuesday, June 16, 2009 7:15 PM Subject: Re: Continuous running hydraulic pump More observation: If I leave my flap lever in the neutral position, the hydralic = reservoir remains fully pressurized, and next time I fly there's no need = for the pump to come on during power up to recharge the system.=20 I understand that some planes/pilots must leave their flap lever in = the UP position, or the DOWN position to retain hydralic pressure until = the next flight. If I did this, all pressure would be released. Why = the difference with what is the same valve?=20 I also have seen the flaps move (briefly) in the opposite direction if = lever is positioned just slightly off of neutral, during routine = operations; I agree that this is a quirk in the internal valve. Jeff Liegner LIVP This is case of creating a problem that wasn't there. My experience = might ease someone's tension in the future. While practicing an approach I got a "check engine" from the = Chelton. The indication was low voltage. I quickly saw the hydraulic = pump was running continuously. I pulled the hydraulic pump breaker. I = got a "gear transition" light so I suspected no hydraulic pressure which = was confirmed when I looked at the gauge. I figured the best thing to do was to leave everything as it was and = hand pump the gear down and land. This worked just fine. Now the problem was that for the first time in over 600 hours of = flying this thing, when I had set the flaps at 10 degrees I had left the = flap handle a little out of the detent and the valve was just dumping = the high side pressure to the low side and just kept the hydraulic pump = running. Some days I think that if every thing is going well I just create a = problem for the practice. At least my rebuild of the gear hand pump = worked well. Dan Reagan IVP 650 hours ------=_NextPart_000_002D_01C9EF31.B5A7AA70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: Continuous running hydraulic pump
My flaps retain pressure on the ground = when left in=20 the down position.  They bleed off in the nuetral = position.
 
Dan Reagan
IVP 650 hrs.
----- Original Message -----
From:=20 Jeffrey=20 Liegner, MD
Sent: Tuesday, June 16, 2009 = 7:15=20 PM
Subject: Re: Continuous running = hydraulic=20 pump

More observation:
If I leave my flap lever in the neutral position, the hydralic = reservoir=20 remains fully pressurized, and next time I fly there's no need for the = pump to=20 come on during power up to recharge the system.

I understand that some planes/pilots must leave their flap lever = in the=20 UP position, or the DOWN position to retain hydralic pressure until = the next=20 flight.  If I did this, all pressure would be released.  Why = the=20 difference with what is the same valve?

I also have seen the flaps move (briefly) in the opposite = direction if=20 lever is positioned just slightly off of neutral, during routine = operations; I=20 agree that this is a quirk in the internal valve.

Jeff Liegner
LIVP


This = is case of=20 creating a problem that wasn't there.  My experience might ease = someone's tension in the future.
 
While = practicing an=20 approach I got a "check engine" from the Chelton.  The = indication was=20 low voltage.  I quickly saw the hydraulic pump was running=20 continuously.  I pulled the hydraulic pump breaker.  I got = a "gear=20 transition" light so I suspected no hydraulic pressure which was = confirmed=20 when I looked at the gauge.
 
I = figured=20 the best thing to do was to leave everything as it was and hand = pump=20 the gear down and land.  This worked just = fine.
 
Now = the problem was=20 that for the first time in over 600 hours of flying this = thing, when I=20 had set the flaps at 10 degrees I had left the flap handle a little = out of=20 the detent and the valve was just dumping the high side = pressure=20 to the low side and just kept the hydraulic pump = running.
 
Some = days I think=20 that if every thing is going well I just create a problem for the=20 practice.  At least my rebuild of the gear hand pump worked=20 well.
 
Dan=20 Reagan
IVP = 650=20 hours

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