X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 25 May 2010 12:24:58 -0400 Message-ID: X-Original-Return-Path: Received: from mail.emmett.org ([69.128.73.170] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4325345 for lml@lancaironline.net; Tue, 25 May 2010 08:43:16 -0400 Received-SPF: none receiver=logan.com; client-ip=69.128.73.170; envelope-from=sbuller@emmett.org X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CAFC07.C25BF8DD" Subject: RE: [LML] Re: Pressurization problem X-Original-Date: Tue, 25 May 2010 08:42:37 -0400 X-Original-Message-ID: <32AF4E4BDA9A00499B3AF0C50C985EFFFA612F@oscar.emmett.org> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: Pressurization problem Thread-Index: Acr8Ab70xlrh1En1Q8yy5bOQ2TTI1AABT1kw From: "Steve Buller" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01CAFC07.C25BF8DD Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Sorry to hear about your trouble... hope you can get it fixed. =20 If you need any of the pressurization parts let me know, I have a IVP kit but I am building it as a IV. All parts are new and packaged the way sent by Lancair, the price will be 40% to 50% off list price. =20 Steve Buller 269-209-5841 =20 ________________________________ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Robert Pastusek Sent: Tuesday, May 25, 2010 8:00 AM To: lml@lancaironline.net Subject: [LML] Re: Pressurization problem Tim wrote:=20 Cabin won't pressurize. Visitor shopping for a 4P was sitting in cabin with a battery charger on the battery supposedly studying the cheltons but I suspect he was pushing every button and switch he could. Now pressure valve won't close. I can hear the dump switch and gear handle switch both clicking in the valve but it doesn't move up or down. Removed the valve and checked for travel. I can manually close it on the bench but it immediately opens again. With pressurized air flowing in (vacume cleaner hooked up in reverse) I can depress the valve with my fingers and almost get it to seal but it immediately opens. Is there another safety switch in the pitot system somewhere? Any idea where? I'd appreciate any advice. Thanks, Tim, N524JG, LNC4P, Ser# 411 =20 Tim, Are you sure you by-passed the gear-down switch? That's the most likely cause of "pressurization dump" when the gear is down. You can test this by pulling the hydraulic pump circuit breaker; then [CAREFULLY and COMPLETELY] bleeding down the hydraulic system with the flaps. (You can add a safety factor by putting a length of 2x2 wood in the nose gear scissors.) When the hydraulic pressure is zero, by-pass the gear down-lock solenoid and raise the gear handle. Then test the system again. In my airplane (depends on how the system is wired, but this is "standard"), the switch that controls the down-lock also controls power to the pressure controller. Could a wire have come off one side of this switch...it's behind the left side of the center vertical console, just below the gear operating lever. Your report of "clicking" above would seem to have already validated this part of the system, but worth checking twice...) Sorry I don't have another idea... =20 BE SURE TO GET THE GEAR HANDLE BACK DOWN BEFORE RESTORING POWER TO THE HYDRAULIC SYSTEM. =20 Bob ------_=_NextPart_001_01CAFC07.C25BF8DD Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Sorry to hear about your trouble... hope you = can get it=20 fixed.

If you need any of the pressurization parts = let me=20 know, I have a IVP kit but I am building it as a IV. All parts are = new and=20 packaged the way sent by Lancair, the price will be 40% to 50% off list=20 price.

Steve Buller 269-209-5841

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of Robert=20 Pastusek
Sent: Tuesday, May 25, 2010 8:00 AM
To:=20 lml@lancaironline.net
Subject: [LML] Re: Pressurization=20 problem

Tim=20 wrote:

Cabin = won’t=20 pressurize. Visitor shopping for a 4P was sitting in cabin with a = battery=20 charger on the battery supposedly studying the cheltons but I suspect he = was=20 pushing every button and switch he could. Now pressure valve = won’t=20 close. I can hear the dump switch and gear handle switch both = clicking in=20 the valve but it doesn’t move up or down. Removed the valve = and checked=20 for travel. I can manually close it on the bench but it = immediately opens=20 again. With pressurized air flowing in (vacume cleaner hooked up = in=20 reverse) I can depress the valve with my fingers and almost get it to = seal but=20 it immediately opens. Is there another safety switch in the pitot = system=20 somewhere? Any idea where?

I’d = appreciate any=20 advice.

Thanks,

Tim, = N524JG, =20 LNC4P, Ser# 411

Tim,

Are=20 you sure you by-passed the gear-down switch? That’s the most = likely cause of=20 “pressurization dump” when the gear is down. You can = test this by pulling=20 the hydraulic pump circuit breaker; then [CAREFULLY and = COMPLETELY]=20 bleeding down the hydraulic system with the flaps. (You can add a safety = factor=20 by putting a length of 2x2 wood in the nose gear scissors.) When = the=20 hydraulic pressure is zero, by-pass the gear down-lock solenoid and = raise the=20 gear handle. Then test the system again. In my airplane (depends = on how=20 the system is wired, but this is “standard”), the switch = that controls the=20 down-lock also controls power to the pressure controller. Could a = wire=20 have come off one side of this switch…it’s behind the left = side of the center=20 vertical console, just below the gear operating lever. Your report of = “clicking”=20 above would seem to have already validated this part of the system, but = worth=20 checking twice…) Sorry I don’t have another = idea…

BE=20 SURE TO GET THE GEAR HANDLE BACK DOWN BEFORE RESTORING POWER TO THE = HYDRAULIC=20 SYSTEM.

Bob

------_=_NextPart_001_01CAFC07.C25BF8DD--