Return-Path: Sender: (Marvin Kaye) To: lml Date: Tue, 01 Jul 2003 11:32:21 -0400 Message-ID: X-Original-Return-Path: Received: from [63.150.227.63] (HELO admsmxs2usr10.ad.jocoks.com) by logan.com (CommuniGate Pro SMTP 4.1b8) with ESMTP id 2453321 for lml@lancaironline.net; Tue, 01 Jul 2003 10:52:54 -0400 X-MimeOLE: Produced By Microsoft Exchange V6.0.6249.0 content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C33FE0.735EFCD8" Subject: [LML] Sound-proofing and ANR Headsets - A Different Perspective X-Original-Date: Tue, 1 Jul 2003 09:52:53 -0500 X-Original-Message-ID: <4B9B1B1833408C40AE2F14A881F276F610B379@admsmxs2usr10.ad.jocoks.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Sound-proofing and ANR Headsets - A Different Perspective Thread-Index: AcM/4HNUju9b9e4sQua0zjUjbWy9Qw== From: "Metcalfe, Lee, AIR" X-Original-To: This is a multi-part message in MIME format. ------_=_NextPart_001_01C33FE0.735EFCD8 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I don't know if it's my personal style or my military flight training (actually my personal style was established by my military flight training!), but I gather a lot of data about the status of my aircraft's operation from senses other than sight. One of the most important inputs as far as I'm concerned is sound. I always start the engine with my headset off (I mean off my head - I don't use ANR). I listen carefully to the engine as it cranks, fires and idles. I can't say that I'm listening for anything in particular, just anything unusual. I taxi and do the run-up with one ear muff pulled back so I can hear the engine. I'm also tuned-in to the vibrations I'm feeling through my butt, my feet and my hands, again looking for anything unusual. On several occasions I have left one ear muff off during take-off when I thought I heard something unusual. Obviously the airstream noise overcomes everything else as you accelerate, but I feel the engine sound info and the gear actuation noises can be useful input. In flight I can hear enough of the mid- and lower frequency sounds through my DC H20-10 headset to feel "connected" to the engine. The H20-10s do a good job of attenuating the higher frequency airstream noise and the exhaust bark. =20 So what's my point? I've tried ANR headsets and I feel they're just too darned quiet! I feel disconnected from the machinery I'm strapped to. I feel there is a lot of value in being able to hear what's going on with the airplane (at a reasonable decibel level, of course!). Also, if I were putting any effort into sound-proofing, I would focus on reducing airstream noise so I could hear the mechanical sounds better! The worst offenders in that regard are the openings in the wing root close-out for the aileron and flap push-rods and the inboard gear door actuators. I'm wondering if the boots some of you have installed do much to help that situation. =20 Just my 2 cents. =20 Lee "Moondog" Metcalfe LNC2 - N320WH - 492 hrs. - Kansas City (IXD) ------_=_NextPart_001_01C33FE0.735EFCD8 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I = don't know if it's=20 my personal style or my military flight training (actually my personal = style was=20 established by my military flight training!), but I gather a lot of data = about=20 the status of my aircraft's operation from senses other than = sight. =20 One of the most important inputs as far as I'm concerned is sound.  = I=20 always start the engine with my headset off (I mean off my head - I = don't use=20 ANR).  I listen carefully to the engine as it cranks, fires and=20 idles.  I can't say that I'm listening for anything in particular, = just=20 anything unusual.  I taxi and do the run-up with one ear muff = pulled back=20 so I can hear the engine.  I'm also tuned-in to the vibrations I'm = feeling=20 through my butt, my feet and my hands, again looking for anything = unusual.=20  On several occasions I have left one ear muff off during take-off = when I=20 thought I heard something unusual.  Obviously the airstream noise = overcomes=20 everything else as you accelerate, but I feel the engine sound info and = the gear=20 actuation noises can be useful input.  In flight I can hear enough = of the=20 mid- and lower frequency sounds through my DC H20-10 headset to = feel=20 "connected" to the engine.  The H20-10s do a good job of = attenuating the=20 higher frequency airstream noise and the = exhaust bark.
 
So = what's my=20 point?  I've tried ANR headsets and I feel they're just too darned=20 quiet!  I feel disconnected from the machinery I'm strapped = to.  I=20 feel there is a lot of value in being able to hear what's going on with = the=20 airplane (at a reasonable decibel level, of course!).  Also, if I = were=20 putting any effort into sound-proofing, I would focus on reducing = airstream=20 noise so I could hear the mechanical sounds better!  The worst = offenders in=20 that regard are the openings in the wing root close-out for the aileron = and flap=20 push-rods and the inboard gear door actuators.  I'm wondering if = the boots=20 some of you have installed do much to help that = situation.
 
Just = my 2=20 cents.
 
Lee = "Moondog"=20 Metcalfe
LNC2 - = N320WH - 492=20 hrs. - Kansas City (IXD)
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