X-Virus-Scanned: clean according to Sophos on Logan.com X-PolluStop: No license found, only first 5 messages were scanned Return-Path: Sender: To: lml Date: Tue, 27 Jun 2006 16:05:47 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 5.1c.1) with ESMTP id 1208171 for lml@lancaironline.net; Tue, 27 Jun 2006 10:10:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.207; envelope-from=VTAILJEFF@aol.com Received: from VTAILJEFF@aol.com by imo-d21.mx.aol.com (mail_out_v38_r7.5.) id q.253.cb928c2 (30739) for ; Tue, 27 Jun 2006 10:09:06 -0400 (EDT) From: VTAILJEFF@aol.com X-Original-Message-ID: <253.cb928c2.31d29601@aol.com> X-Original-Date: Tue, 27 Jun 2006 10:09:05 EDT Subject: Re: [LML] Re: Sterling Ainsworth accident X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1151417345" X-Mailer: 9.0 SE for Windows sub 5026 X-Spam-Flag: NO -------------------------------1151417345 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/26/2006 12:26:28 AM Central Standard Time, hwasti@starband.net writes: The pitot tube is blocked due to icing. The windshield may be iced over as well, blocking all outside references even if the airplane does break out into VMC. The airplane is descending, causing the indicated airspeed to decrease (the difference between the increasing static pressure at lower altitudes and the "high pressure" air trapped in the pitot system is becoming less and less). The pilot pushes the nose down making the dive steeper and decreasing the ground speed reported by the GPS. The decreasing ground speed correlates with the decreasing indicated airspeed. Even the unwinding altimeter could be interpreted as a stalled airplane in a descent by someone focused on a stall as the main problem. Happened to a 727 years ago....happened to a 757 ( I believe, in South America due to a blocked pitot sytem from a wash job). I will say this again-- turn on the pitot heat before takeoff. Jeff -------------------------------1151417345 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 6/26/2006 12:26:28 AM Central Standard Time,=20 hwasti@starband.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>The=20 pitot tube is blocked due to icing. The windshield may be iced over=20= as=20 well, blocking all outside references even if the airplane does break out=20= into=20 VMC.

The airplane is descending, causing the indicated airspeed to=20 decrease (the difference between the increasing static pressure at lower=20 altitudes and the "high pressure" air trapped in the pitot system is becom= ing=20 less and less).

The pilot pushes the nose down making the dive stee= per=20 and decreasing the ground speed reported by the GPS. The decreasing=20 ground speed correlates with the decreasing indicated airspeed. Even= the=20 unwinding altimeter could be interpreted as a stalled airplane in a descen= t by=20 someone focused on a stall as the main problem.

Happened to a 727 years ago....happened to a 757 ( I believe, in South=20 America due to a blocked pitot sytem from a wash job). I will say this again= --=20 turn on the pitot heat before takeoff.

Jeff

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