X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Wed, 18 Nov 2009 09:33:27 -0500 Message-ID: X-Original-Return-Path: Received: from smtpauth05.prod.mesa1.secureserver.net ([64.202.165.99] verified) by logan.com (CommuniGate Pro SMTP 5.3c2) with SMTP id 3980685 for lml@lancaironline.net; Wed, 18 Nov 2009 08:30:28 -0500 Received-SPF: none receiver=logan.com; client-ip=64.202.165.99; envelope-from=randy@aoaircrafters.com Received: (qmail 10846 invoked from network); 18 Nov 2009 13:29:51 -0000 Received: from unknown (173.21.12.80) by smtpauth05.prod.mesa1.secureserver.net (64.202.165.99) with ESMTP; 18 Nov 2009 13:29:50 -0000 From: "Randy Hartman" X-Original-To: "'Jay M. Sabot'" , "'lml'" X-Original-Cc: References: In-Reply-To: Subject: RE: What could be causing this in-flight noise on my Legacy? X-Original-Date: Wed, 18 Nov 2009 07:29:39 -0600 X-Original-Message-ID: <005101ca6853$2e5bc1a0$8b1344e0$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0052_01CA6820.E3C151A0" X-Mailer: Microsoft Office Outlook 12.0 Content-Language: en-us Thread-Index: AcpnnLmb9Q1jP56CTYWXhjTAzjU+cAAtcgBw This is a multi-part message in MIME format. ------=_NextPart_000_0052_01CA6820.E3C151A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Jay, I have a Lancair 360 with an IO-360 engine. I recently had the same sound - like a slamming gear door against the bottom of the fuselage - only it was on full power take-off. It turned out to be an intermittent ignition timing sensor on the front of the engine. I have the Electroair dual electronic ignition system on my 360. If you have electronic ignition, you might check this out. Randy Hartman 319 360-9775 N360DE From: Jay M. Sabot [mailto:jsabot@oxforditconsult.com] Sent: Tuesday, November 17, 2009 9:44 AM To: lml Subject: What could be causing this in-flight noise on my Legacy? Yesterday afternoon while flying Legacy N26XY (with about 17 hours to date), power and speed were reduced to explore the lower speed range of the airplane. Was at 4,500 MSL, smooth air. As the airplane decelerated thru 89 knots TAS, once or twice a sound was heard that can best be described as a door closing shut firmly. It sounded like a landing gear door being slapped against the fuselage/cowling by the slip stream. However, the gear was retracted. Opening the throttle and increasing speed eliminated the noise. The slapping sound, like a door closing firmly, did not reoccur. The noise occurred only once or twice per event. I proceeded to repeat the flight conditions, and the same thing happened: As the airplane decelerated to below 90 knots with the gear retracted and no flaps extended, just like the first time, the noise was heard again two or three times over about 6 or 7 seconds. The throttle was advanced and the noise did not repeat itself. I reduced the throttle and lowered the landing gear and allowed the airplane to decelerate again. Same thing happened with the gear extended, (no flaps). A sound much like I imagine would be made if a gear door was swinging loose in the slipstream and occasionally hitting the wing skin or cowling. Advancing the throttle and retracting the gear was normal and the noise did not reoccur. Returned for a normal landing. In the hangar, the gear and doors were examined only to find them all attached firmly as they have been from the beginning. Nothing is loose, no sign of anything striking the cowl or lower wing skins. Anyone had any similar experience? Would appreciate any commentary on the situation and their findings in this regard. Thanks all. Jay M. Sabot ------=_NextPart_000_0052_01CA6820.E3C151A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Jay,

 

I have a Lancair 360 with an IO-360 engine.  I = recently had the same sound - like a slamming gear door against the bottom of the = fuselage - only it was on full power take-off.  It turned out to be an intermittent = ignition timing sensor on the front of the engine.  I have the Electroair = dual electronic ignition system on my 360.

 

If you have electronic ignition, you might check this = out.

 

Randy Hartman

319 360-9775

N360DE

 

From:= Jay M. = Sabot [mailto:jsabot@oxforditconsult.com]
Sent: Tuesday, November 17, 2009 9:44 AM
To: lml
Subject: What could be causing this in-flight noise on my Legacy? =

 

Yesterday afternoon while flying Legacy N26XY (with about = 17 hours to date), power and speed were reduced to explore the lower speed range = of the airplane. Was at 4,500 MSL, smooth air.

 

As the airplane decelerated thru 89 knots TAS, once or = twice a sound was heard that can best be described as a door closing shut = firmly. It sounded like a landing gear door being slapped against the = fuselage/cowling by the slip stream. However, the gear was retracted.

 

Opening the throttle and increasing speed eliminated the = noise. The slapping sound, like a door closing firmly, did not reoccur. The = noise occurred only once or twice per event. I proceeded to repeat the flight conditions, and the same thing happened: As the airplane decelerated to = below 90 knots with the gear retracted and no flaps extended, just like the = first time, the noise was heard again two or three times over about 6 or 7 = seconds. The throttle was advanced and the noise did not repeat itself. =

 

I reduced the throttle and lowered the landing gear and = allowed the airplane to decelerate again. Same thing happened with the gear = extended, (no flaps). A sound much like I imagine would be made if a gear door was swinging loose in the slipstream and occasionally hitting the wing skin = or cowling. Advancing the throttle and retracting the gear was normal and = the noise did not reoccur.

Returned for a normal landing.

In the hangar, the gear and doors were examined only to find them all = attached firmly as they have been from the beginning. Nothing is loose, no sign = of anything striking the cowl or lower wing skins.

Anyone had any similar experience?  Would appreciate any commentary = on the situation and their findings in this regard.

 

 

Thanks all.

 

Jay M. Sabot 

 

 

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