Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Thu, 20 May 2004 14:55:01 -0400 Message-ID: X-Original-Return-Path: Received: from [207.254.33.66] (HELO DEWEY2.Cadwell.cadwell.com) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 81104 for lml@lancaironline.net; Thu, 20 May 2004 14:47:15 -0400 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C43E9A.DD296A90" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Subject: Door pump stays on at altitude X-Original-Date: Thu, 20 May 2004 11:47:12 -0700 X-Original-Message-ID: <63D0A1D8F168684F8502C4B8A229D7911691E6@DEWEY2.Cadwell.cadwell.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Door pump stays on at altitude Thread-Index: AcQ+mt97kdiVwWPuTvaQ0hZJJBTK3g== From: "Carl Cadwell" X-Original-To: This is a multi-part message in MIME format. ------_=_NextPart_001_01C43E9A.DD296A90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My IVP door pump stays on continuously at FL200 and above. History: I replaced the door seal 3 weeks ago after a leak developed at = the seam. Checking the system for leaks reveals none. Flights below the flight levels are normal. The pump comes on = occasionally and turns off in a few seconds. The first time going to flight levels after the new door seal is = installed and the pump ran continuously. At my destination, I soaped = for leaks and none were found. I removed the connection of the seal to = the brass fitting, reseated it with soapy water and put a tie wrap = around the connection. On the return trip, the door seal pump ran about = =BD of the time. =20 I removed the fitting to seal connection and reinstalled it with = silicone and another tie wrap. The pump again ran continuously. I lost = partial cabin pressure after about an hour and landed in Boise and = finished the trip on Delta. The pump still runs and pumps up the seal. I have not had an opportunity to trouble shoot it again. I will as soon = as I retrieve the plane and return home. Any suggestions as to culprit? What to look for? Suspicions: 1. It is really cold up at the flight levels and the check = valve or the pressure switch is freezing. 2. I have a leak somewhere which does not show up on the ground. 3. The pump can't pump enough pressure to turn off the pressure switch, = but why only at altitude? Any help would be appreciated. Thanks,=20 Carl Cadwell N25CL, 530 hours ------_=_NextPart_001_01C43E9A.DD296A90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Door pump stays on at altitude

My = IVP door pump stays on continuously at FL200 and = above.

History:  I replaced the door seal 3 weeks ago after = a leak developed at the seam.

Checking the system for leaks reveals none.

Flights below the flight levels are normal.  The pump = comes on = occasionally and turns off in a few seconds.

The = first time going to flight levels after the new door = seal is installed and the pump ran continuously.  At my destination, I soaped for leaks and = none were found.  I removed the connection of the seal to the brass = fitting, reseated it with soapy water and put a tie wrap = around the connection.  On = the return trip, the door seal pump ran about =BD of the = time. 

I = removed the fitting to seal connection and reinstalled it with silicone = and another tie wrap.  The pump again ran continuously.  I = lost = partial cabin pressure after about an hour and landed in Boise = and finished the trip on Delta.

The = pump still runs and pumps up the seal.

I = have not had an opportunity to trouble shoot it again.  I will as soon as I = retrieve the plane and return home.

Any = suggestions as to culprit?  What to look for?

Suspicions: 1.  It is really cold up = at the flight levels and the check valve or the pressure switch is = freezing.

2.      = I have a leak somewhere which does not = show up on the ground.
3.      The pump can’t pump enough = pressure = to turn off the pressure switch, but why = only at altitude?

Any = help would be appreciated.

Thanks,

Carl Cadwell

N25CL, 530 hours

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