X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 21 Oct 2013 07:35:21 -0400 Message-ID: X-Original-Return-Path: Received: from smtp2v2.av-mx.com ([137.118.16.30] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6546465 for lml@lancaironline.net; Fri, 18 Oct 2013 17:46:26 -0400 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.30; envelope-from=pinetownd@volcano.net Received: from localhost (localhost [127.0.0.1]) by smtp2v2.av-mx.com (Postfix) with ESMTP id 19C3BC8053E for ; Fri, 18 Oct 2013 17:45:53 -0400 (EDT) X-Virus-Scanned: amavisd-new at av-mx.com Received: from smtp2v2.av-mx.com ([127.0.0.1]) by localhost (smtp2v2.av-mx.com [127.0.0.1]) (amavisd-new, port 10124) with ESMTP id AZSC_ryIyya6 for ; Fri, 18 Oct 2013 17:45:51 -0400 (EDT) Received: from DennisPC (unknown [65.170.222.166]) (Authenticated sender: pinetownd@volcano.net) by smtp2v2.av-mx.com (Postfix) with ESMTPA for ; Fri, 18 Oct 2013 17:45:51 -0400 (EDT) X-Original-Message-ID: From: "Dennis Johnson" X-Original-To: "Lancair Mailing List" Subject: Legacy Brake Vibration Fixed X-Original-Date: Fri, 18 Oct 2013 14:45:54 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_3AB3_01CECC10.BFA3D010" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_3AB3_01CECC10.BFA3D010 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable A couple of months ago the right brake on my Legacy RG developed a = vibration. Upon initial braking shortly after touchdown, the brakes = were smooth. However, after a second or so of braking, the right main = landing gear started vibrating. Releasing brake pressure immediately = made the vibration go away. If it had been a car, I would have said the = rotor was warped. I jacked up the airplane and checked the run-out of = the disk with a dial indicator. It was true within .002". Of course, = that was with a room temperature disk. I called Cleveland tech support and was told the most likely fix was to = replace the brake disk. I replaced both disks and the vibration = disappeared. Measuring the old disks, there was significant "coning," = in which the disk is thicker at the outside edge than near the axle. = Cleveland's coning limit for my disks was .015" and the right brake on = mine was .025". The disk still met the spec for total thickness. I've got about 660 hours on the Cleveland brakes and maybe a thousand = landings. (You'd think I'd make better landings with that much = practice!) I'm surprised that my brake disks wore out so quickly. On = the other hand, I typically fly out of shorter runways at higher density = altitudes, so maybe it's just a lot of heavy braking. Dennis Legacy RG 660 hours =20 ------=_NextPart_000_3AB3_01CECC10.BFA3D010 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

A couple of months ago the right brake on my Legacy RG developed a=20 vibration. Upon initial braking shortly after touchdown, the = brakes were=20 smooth. However, after a second or so of braking, the right main = landing=20 gear started vibrating. Releasing brake pressure immediately made = the=20 vibration go away. If it had been a car, I would have said the = rotor was=20 warped. I jacked up the airplane and checked the run-out of the = disk with=20 a dial indicator. It was true within .002". Of course, that = was with=20 a room temperature disk.

I called Cleveland tech support and was told the most likely fix = was to=20 replace the brake disk. I replaced both disks and the vibration=20 disappeared. Measuring the old disks, there was significant = "coning,"=20 in which the disk is thicker at the outside edge than near the = axle. =20 Cleveland's coning limit for my disks was .015" and the right brake on = mine was=20 .025". The disk still met the spec for total thickness.

I've got about 660 hours on the Cleveland brakes and maybe a = thousand=20 landings. (You'd think I'd make better landings with that much=20 practice!) I'm surprised that my brake disks wore out so = quickly. On=20 the other hand, I typically fly out of shorter runways at higher = density=20 altitudes, so maybe it's just a lot of heavy braking.

Dennis

Legacy RG 660 hours

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