X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 26 Sep 2007 08:22:17 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m28.mx.aol.com ([64.12.137.9] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2352138 for lml@lancaironline.net; Wed, 26 Sep 2007 01:30:45 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.9; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m28.mx.aol.com (mail_out_v38_r9.2.) id q.c6e.1aaa3886 (39955) for ; Wed, 26 Sep 2007 01:30:02 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Wed, 26 Sep 2007 01:30:02 EDT Subject: Re: [LML] Airspeed Indicator Consult X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1190784602" X-Mailer: AOL 9.0 VR sub 165 X-Spam-Flag: NO -------------------------------1190784602 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/25/2007 11:56:07 P.M. Central Daylight Time, Lancair1@bellsouth.net writes: So, we have here a situation in which the AS tested out fine on the ground, and bad in the air. Any idea why? Doug, If one believes that the pitot side (all the way from the pitot tube to the AS) is good, then the static side should be checked. Did the mechanic actually test the pitot part of the system by pressurizing the wing mounted pitot tube as opposed to supplying pressure to the AS pitot port? Can you test the pitot system with the engine running as vibration might expose the problem. Was it tested with the cockpit pressurized? The pitot/static systems only come together in possibly 3 places - AS indicator, air speed driven squat switch and an AOI system (if any). Is it possible that air pressure related to air speed is getting into the static side - i.e. was your VS or altimeter operating properly during the takeoff roll and the short flight? Is it possible that there is water in the static line? Could you try to pressurize (lower) the static system at the static port and check that the VS and altimeter are operating properly? Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Darwinian culling phrase: Watch This! ************************************** See what's new at http://www.aol.com -------------------------------1190784602 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 9/25/2007 11:56:07 P.M. Central Daylight Time,=20 Lancair1@bellsouth.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>So, we have here a=20= situation=20 in which the AS tested out fine on the ground, and bad in the air. Any ide= a=20 why?
Doug,
 
If one believes that the pitot side (all the way from the pitot tube to= the=20 AS) is good, then the static side should be checked. Did the mechanic actual= ly=20 test the pitot part of the system by pressurizing the wing mounted pitot tub= e as=20 opposed to supplying pressure to the AS pitot port?  Can you test the p= itot=20 system with the engine running as vibration might expose=20 the problem.  Was it tested with the cockpit pressurized?
 
The pitot/static systems only come together in possibly 3 places - = ;AS=20 indicator, air speed driven squat switch and an AOI system (if any).  I= s it=20 possible that air pressure related to air speed is getting into the static s= ide=20 - i.e. was your VS or altimeter operating properly during the takeoff roll a= nd=20 the short flight?  Is it possible that there is water in the static=20 line?  Could you try to pressurize (lower) the static system at th= e=20 static port and check that the VS and altimeter are operating=20 properly?  =20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Darwinian culling phrase: Watch=20 This!



See wha= t's new at AOL.co= m and Make AOL Your Homepage.
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