X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp105.sbc.mail.mud.yahoo.com ([68.142.198.204] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with SMTP id 1031243 for flyrotary@lancaironline.net; Sun, 12 Mar 2006 01:30:42 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.198.204; envelope-from=dcarter11@sbcglobal.net Received: (qmail 74341 invoked from network); 12 Mar 2006 06:29:56 -0000 Received: from unknown (HELO davidsdell8200) (dcarter11@sbcglobal.net@67.41.226.150 with login) by smtp105.sbc.mail.mud.yahoo.com with SMTP; 12 Mar 2006 06:29:55 -0000 Message-ID: <374901c6459e$5d20ae50$6401a8c0@davidsdell8200> From: "David Carter" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] flutter encounter....AOPA article Date: Sat, 11 Mar 2006 23:29:48 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_3746_01C64563.B0162D00" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_3746_01C64563.B0162D00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable reviewOne of the A-7Ds in my squadron had an aileron flutter problem - = found a bearing for the aileron was loose in its mounting to the wing = (was "unstaked", not secured properly). When climbing at 400 KIAS = passing between 15,000 and 17,000, the mach number was coming up to = about .80 and the flutter would self-excite with no manuevering - no = damage, just scared the pilot (yanked throttle to idle and pulled up to = slow down and it would stop, then returned to land declaring an = emergency - thought it was an engine vibration such as would be caused = by losing a turbine blade in aft end of engine. Engine was checked OK - = flutter (never saw what was fluttering, just felt an awful shaking of = everything in the cockpit) was repeatable on 3 different test flights. = As this was a speed-altitude condition no one ever flew at we kept = flying the plane on regular missions. Took several months before Vought = led us to the cause - the loose aileron bearing. David ----- Original Message -----=20 From: Marc Wiese=20 To: Rotary motors in aircraft=20 Sent: Saturday, March 11, 2006 4:17 PM Subject: [FlyRotary] flutter encounter....AOPA article >NEVER AGAIN ONLINE: FLUTTERING WITH DISASTER Flutter and wing = oscillations rendered the aircraft uncontrollable with imminent = structural failure as a probable ending: a harrowing event with a = remarkable outcome. The pilot's swift action and a good dose of luck = helped him and his passengers survive the ordeal. Read ( = http://www.aopa.org/epilot/redir.cfm?adid=3D8497 ) how this pilot = handled an extreme emergency--a lesson he would not wish to repeat.< =20 ------=_NextPart_000_3746_01C64563.B0162D00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable review
One of the A-7Ds in my squadron had an = aileron=20 flutter problem - found a bearing for the aileron was loose in its = mounting to=20 the wing (was "unstaked", not secured properly).  When climbing at = 400 KIAS=20 passing between 15,000 and 17,000, the mach number was coming up to = about .80=20 and the flutter would self-excite with no manuevering - no damage, just=20 scared the pilot (yanked throttle to idle and pulled up to slow = down and it=20 would stop, then returned to land declaring an emergency - thought it = was an=20 engine vibration such as would be caused by losing a turbine blade in = aft end of=20 engine.  Engine was checked OK - flutter (never saw what was = fluttering,=20 just felt an awful shaking of everything in the cockpit) was = repeatable on=20 3 different test flights.  As this was a speed-altitude condition = no one=20 ever flew at we kept flying the plane on regular = missions.  Took=20 several months before Vought led us to the cause - the loose aileron=20 bearing.
 
David
----- Original Message -----
From:=20 Marc=20 Wiese
Sent: Saturday, March 11, 2006 = 4:17=20 PM
Subject: [FlyRotary] flutter=20 encounter....AOPA article

>NEVER=20 AGAIN ONLINE: FLUTTERING WITH DISASTER Flutter and wing oscillations = rendered=20 the aircraft uncontrollable with imminent structural failure as a = probable=20 ending: a harrowing event with a remarkable outcome. The pilot's swift = action=20 and a good dose of luck helped him and his passengers survive the = ordeal. Read=20 ( http://www.aopa= .org/epilot/redir.cfm?adid=3D8497=20 ) how this pilot handled an extreme emergency--a lesson he would not = wish to=20 repeat.<

 =20

 

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