Sender: <marv@lancaironline.net>
To:  lml
Date: Tue, 17 Nov 2009 18:53:23 -0500
Message-ID: <redirect-3980013@logan.com>
Received-SPF: pass
 receiver=logan.com; client-ip=72.14.220.156; envelope-from=ronlaughlin@gmail.com
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:content-transfer-encoding;
        b=vkBQzghRCKHmV9zUH305yQabZrzZDc1LXwupEQTe5jEAEdnu1NPJ3CTN86i3Hq+ING
         A70jjA8lPPdSOg4I7RbrKS5MIGtHDi0p9MrNAsjKDoQwPLkp4B89jnHS9nWreY+48nJw
         dC6VpVmZpmyzJJ0978HDhB3BDAx0bYZeFfG+Y=
MIME-Version: 1.0
Reply-To: ronlaughlin@hotmail.com
In-Reply-To: <list-3979448@logan.com>
References: <list-3979448@logan.com>
Subject: Re: [LML] What could be causing this in-flight noise on my Legacy?
From: Ron Laughlin <ronlaughlin@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Engine backfiring?
Ron


On Tue, Nov 17, 2009 at 9:43 AM, Jay M. Sabot
<jsabot@oxforditconsult.com> wrote:
> Yesterday afternoon while flying Legacy N26XY (with about 17 hours to dat=
e),
> 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 sounde=
d
> like a landing gear door being slapped against the fuselage/cowling by th=
e
> slip stream. However, the gear was retracted.
>
>
>
> Opening the throttle and increasing speed eliminated the noise. The slapp=
ing
> sound, like a door closing firmly, did not reoccur. The noise occurred on=
ly
> 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 wi=
th
> 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 airpl=
ane
> to decelerate again. Same thing happened with the gear extended, (no flap=
s).
> A sound much like I imagine would be made if a gear door was swinging loo=
se
> in the slipstream and occasionally hitting the wing skin or cowling.
> Advancing the throttle and retracting the gear was normal and the noise d=
id
> 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, n=
o
> sign of anything striking the cowl or lower wing skins.
>
> Anyone had any similar experience?=A0 Would appreciate any commentary on =
the
> situation and their findings in this regard.
>
>
>
>
>
> Thanks all.
>
>
>
> Jay M. Sabot
>
>
>
>