X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Tue, 17 Nov 2009 18:53:23 -0500 Message-ID: X-Original-Return-Path: Received: from mail-yx0-f184.google.com ([209.85.210.184] verified) by logan.com (CommuniGate Pro SMTP 5.3c2) with ESMTP id 3979525 for lml@lancaironline.net; Tue, 17 Nov 2009 11:48:23 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.184; envelope-from=dballin@gmail.com Received: by yxe14 with SMTP id 14so179609yxe.7 for ; Tue, 17 Nov 2009 08:47:47 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:reply-to:in-reply-to:references:date:message-id :subject:from:to:content-type; b=enJjB8wpUGyZXV5MTLoY0xqj3V8jY2i0EsXOvoCKvQhbKdJFmm+orIOZbie7SDW9Qz rNXfLUvxM4D67lNtEH4s+63MJ8WEVol8vV+9nuI1P/vjb7gWjH8qRhfUTRWBWtuA4CAq rblAq1AWki/XkKGSeubUqzaYuI3aGPI9hbQRE= MIME-Version: 1.0 Received: by 10.90.216.7 with SMTP id o7mr324100agg.45.1258476467701; Tue, 17 Nov 2009 08:47:47 -0800 (PST) Reply-To: dballin@gmail.com In-Reply-To: References: X-Original-Date: Tue, 17 Nov 2009 08:47:47 -0800 X-Original-Message-ID: Subject: Re: [LML] What could be causing this in-flight noise on my Legacy? From: Dan Ballin X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=001636284dd4d0c7cb047893e2a4 --001636284dd4d0c7cb047893e2a4 Content-Type: text/plain; charset=ISO-8859-1 I have had something similar, but was backfiring when the throttle was reduced, but I swore it was a door or something like that. Try reducing mixture and then throttle and see if it still happens Dan Ballin LEG2#286 On Tue, Nov 17, 2009 at 7:43 AM, Jay M. Sabot wrote: > 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 However, the gear was retracted.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 > > > > > --001636284dd4d0c7cb047893e2a4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I have had something similar, but was backfiring when the throttle was redu= ced, but I swore it was a door or something like that.=A0 Try reducing mixt= ure and then throttle and see if it still happens

Dan Ballin
LEG2= #286

On Tue, Nov 17, 2009 at 7:43 AM, Jay M. Sabo= t <jsabo= t@oxforditconsult.com> wrote:

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

=A0

As the airpl= ane 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 agai= nst the fuselage/cowling by the slip stream. However, the gear was retracted.

=A0

Opening the = throttle and increasing speed eliminated the noise. The slapping sound, like a door closing firmly, did n= ot reoccur. The noise occurred only once or twice per event. I proceeded to re= peat the flight conditions, and the same thing happened: As the airplane deceler= ated 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.

=A0

I reduced th= e throttle and lowered the landing gear and allowed the airplane to decelerate again. Same thing happe= ned with the gear extended, (no flaps). A sound much like I imagine would be ma= de if a gear door was swinging loose in the slipstream and occasionally hittin= g the wing skin or cowling. Advancing the throttle and retracting the gear wa= s 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 attac= hed 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?=A0 Would appreciate any commentary on th= e situation and their findings in this regard.=

=A0

=A0

Thanks all.

=A0

Jay M. Sabot=A0

=A0

=A0


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