X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 29 Jan 2010 10:31:50 -0500 Message-ID: X-Original-Return-Path: Received: from vms173005pub.verizon.net ([206.46.173.5] verified) by logan.com (CommuniGate Pro SMTP 5.3.2) with ESMTP id 4103027 for lml@lancaironline.net; Thu, 28 Jan 2010 23:54:53 -0500 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.5; envelope-from=tom.gourley@verizon.net Received: from jacky0da39824a ([unknown] [71.111.114.14]) by vms173005.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0KWZ00DFRSACYSV9@vms173005.mailsrvcs.net> for lml@lancaironline.net; Thu, 28 Jan 2010 22:54:14 -0600 (CST) X-Original-Message-id: Reply-to: "Tom Gourley" From: "Tom Gourley" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Airspeed sensing switch needed X-Original-Date: Thu, 28 Jan 2010 20:54:10 -0800 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_0067_01CAA05C.0A755EE0" X-Priority: 3 X-MSMail-priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 100128-1, 01/28/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0067_01CAA05C.0A755EE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable "I have my airspeed sensing switch set a 90 knots, in the gear-up = circuit, so that no matter where the gear switch is, it can't raise the = gear unless the airspeed is greater than 90 knots. Same on landing. I fi forget to put the gear switch to down, the gear = will come down anyway at 90 knots." As I recall Piper used to have an automatic gear extension system on the = Arrow. After some accidents caused by the gear coming down before the = pilot expected or wanted it to, and sometimes failing to retract because = best angle climb speed could be below the gear extension speed, Piper = published a service bulletin recommending disabling the automatic gear = extension system. Sounds to me like the system was too simple, using = one set airspeed below which the gear would extend if it was up, or stay = down after takeoff even though the gear switch was in the retracted = position. There was an override switch but too often the pilot forgot = about it, especially in a tense situation. Tom Gourley ------=_NextPart_000_0067_01CAA05C.0A755EE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
"I have my airspeed sensing switch set a 90 knots, in the = gear-up=20 circuit, so that no matter where the gear switch is, it can't raise the = gear=20 unless the airspeed is greater than 90 knots.
Same on landing.  I fi forget to put the gear switch to = down, the=20 gear will come down anyway at 90 knots."
 
As I recall Piper used to have an = automatic=20 gear extension system on the Arrow.  After some accidents caused by = the=20 gear coming down before the pilot expected or wanted it to, and = sometimes=20 failing to retract because best angle climb speed could = be below=20 the gear extension speed, Piper published a service bulletin=20 recommending disabling the automatic gear extension system.  = Sounds to=20 me like the system was too simple, using one set airspeed below which = the gear=20 would extend if it was up, or stay down after takeoff even though the = gear=20 switch was in the retracted position.  There was an override = switch=20 but too often the pilot forgot about it, especially in a tense=20 situation.
 
Tom Gourley
 
 
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