X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ch1outboundpool.messaging.microsoft.com ([216.32.181.183] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTPS id 6072829 for lml@lancaironline.net; Tue, 19 Feb 2013 18:37:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=216.32.181.183; envelope-from=rpastusek@htii.com Received: from mail214-ch1-R.bigfish.com (10.43.68.242) by CH1EHSOBE008.bigfish.com (10.43.70.58) with Microsoft SMTP Server id 14.1.225.23; Tue, 19 Feb 2013 23:36:42 +0000 Received: from mail214-ch1 (localhost [127.0.0.1]) by mail214-ch1-R.bigfish.com (Postfix) with ESMTP id 203382E0201 for ; Tue, 19 Feb 2013 23:36:42 +0000 (UTC) X-Forefront-Antispam-Report: CIP:157.56.245.5;KIP:(null);UIP:(null);IPV:NLI;H:CH1PRD0710HT003.namprd07.prod.outlook.com;RD:none;EFVD:NLI X-SpamScore: -2 X-BigFish: PS-2(zz98dIc85fh1453Izz1f42h1ee6h1de0h1202h1e76h1d1ah1d2ahzz17326ah8275bh8275dh18c673hz2fh2a8h668h839hd25hf0ah1288h12a5h12bdh137ah1441h1504h1537h153bh15d0h162dh1631h1758h18e1h1946h19b5h19ceh1155h) Received-SPF: pass (mail214-ch1: domain of htii.com designates 157.56.245.5 as permitted sender) client-ip=157.56.245.5; envelope-from=rpastusek@htii.com; helo=CH1PRD0710HT003.namprd07.prod.outlook.com ;.outlook.com ; Received: from mail214-ch1 (localhost.localdomain [127.0.0.1]) by mail214-ch1 (MessageSwitch) id 1361316956960735_9981; Tue, 19 Feb 2013 23:35:56 +0000 (UTC) Received: from CH1EHSMHS021.bigfish.com (snatpool3.int.messaging.microsoft.com [10.43.68.225]) by mail214-ch1.bigfish.com (Postfix) with ESMTP id F31F51C019C for ; Tue, 19 Feb 2013 23:35:53 +0000 (UTC) Received: from CH1PRD0710HT003.namprd07.prod.outlook.com (157.56.245.5) by CH1EHSMHS021.bigfish.com (10.43.70.21) with Microsoft SMTP Server (TLS) id 14.1.225.23; Tue, 19 Feb 2013 23:35:53 +0000 Received: from CH1PRD0710MB367.namprd07.prod.outlook.com ([169.254.11.162]) by CH1PRD0710HT003.namprd07.prod.outlook.com ([10.255.152.38]) with mapi id 14.16.0263.000; Tue, 19 Feb 2013 23:35:50 +0000 From: Robert R Pastusek To: Lancair Mailing List Subject: RE: [LML] IV nose gear Thread-Topic: [LML] IV nose gear Thread-Index: AQHODlirdnOmclAeh0u4RrxM8LnQhZiBzcBw Date: Tue, 19 Feb 2013 23:35:47 +0000 Message-ID: <41361035E6613244A377D5AC3BF5EFDD4A890B7E@CH1PRD0710MB367.namprd07.prod.outlook.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [65.202.241.130] Content-Type: multipart/alternative; boundary="_000_41361035E6613244A377D5AC3BF5EFDD4A890B7ECH1PRD0710MB367_" MIME-Version: 1.0 Return-Path: rpastusek@htii.com X-OriginatorOrg: htii.com --_000_41361035E6613244A377D5AC3BF5EFDD4A890B7ECH1PRD0710MB367_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Carl wrote: Today on takeoff from Leesburg Fl on a trip back to Ann Arbor MI the tower = controller informed me that one of my landing gear was not retracted. Check= ed the indicator lights and sure enough the nose gear light was indicating = down and locked- but the mains had retracted normally. I cycled the gear do= wn at about 150 kts (3 green), then back up as I climbed out. Still nose ge= ar down and locked... Slowed to 125, my usual gear down speed, cycled the = gear down, 3 green. Retracted gear, all three came up as usual. Anyone had a problem like this before? I checked over the gear after landin= g and everything looks normal. Plan to put it on jacks and swing the gear b= efore flying again but any ideas on this one would be appreciated. We replaced the gas strut at annual in October, simply because it had been = in use for about 10 years. We also replaced the hydraulic cylinder end and = did the over center link mod per service bulletin SB074-0111. Did gear swin= g after that work, all fine. Have done about 15 landings since the October = annual. Carl Loomis Carl, I have not heard of this occurrence before, but it sounds like either a res= tricted/galled nose actuator or significant friction/binding in the nose ge= ar retract mechanism. Bending of the linkage/actuator rod/etc is a classic = cause of this, but is not common at all within the IV-IV/P fleet. In any ca= se, this is not something to mess around with-if any of these things are th= e cause, a failure to extend is as likely as a failure to retract! By the w= ay, increased airspeed will slow/can limit the extension of your gear, espe= cially emergency extension, but not retraction. Ditto for a defective gas s= pring/air strut. If it were mine, I'd put the plane on jacks, disconnect the gas spring and = the actuator cylinder and check the hinges/folding links for binding. You c= an also raise/lower the gear while on jacks and with the nose gear actuator= disconnected, but for a completely valid check, I'd then remove the actuat= or and inspect the inside carefully after the functional test. I'll send yo= u Chris Zavatson's excellent article about disassembling/servicing the actu= ator by separate email. I can't think of any other possibilities, given that it's worked before, an= d did so again after three tries... During normal operation, my nose gear a= lways extends and retracts first, with the mains being slower to both exten= d fully and to retract fully. Bob --_000_41361035E6613244A377D5AC3BF5EFDD4A890B7ECH1PRD0710MB367_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Carl wrote:

 

Today on takeoff from Leesburg Fl on a trip back to = Ann Arbor MI the tower controller informed me that one of my landing gear w= as not retracted. Checked the indicator lights and sure enough the nose gea= r light was indicating down and locked- but the mains had retracted normally. I cycled the gear down at about 150 = kts (3 green), then back up as I climbed out. Still nose gear down and lock= ed…  Slowed to 125, my usual gear down speed, cycled the gear do= wn, 3 green. Retracted gear, all three came up as usual.

 

Anyone had a problem like this before? I checked ove= r the gear after landing and everything looks normal. Plan to put it on jac= ks and swing the gear before flying again but any ideas on this one would b= e appreciated.

 

We replaced the gas strut at annual in October, simp= ly because it had been in use for about 10 years. We also replaced the hydr= aulic cylinder end and did the over center link mod per service bulletin SB= 074-0111. Did gear swing after that work, all fine. Have done about 15 landings since the October annual.=

 

Carl Loomis

 

Carl,

 

I have not heard of this occurrence before, b= ut it sounds like either a restricted/galled nose actuator or significant f= riction/binding in the nose gear retract mechanism. Bending of the linkage/actuator rod/etc is a= classic cause of this, but is not common at all within the IV-IV/P fleet. = In any case, this is not something to mess around with—if any of thes= e things are the cause, a failure to extend is as likely as a failure to retract! By the way, increased airspeed will = slow/can limit the extension of your gear, especially emergency extension, = but not retraction. Ditto for a defective gas spring/air strut.

 

If it were mine, I’d put the plane on j= acks, disconnect the gas spring and the actuator cylinder and check the hin= ges/folding links for binding. You can also raise/lower the gear while on jacks and with the nose gear actuator disconnected, but = for a completely valid check, I’d then remove the actuator and inspec= t the inside carefully after the functional test. I’ll send you Chris Zavatson’s excellent article about disa= ssembling/servicing the actuator by separate email.

 

I can’t think of any other possibilitie= s, given that it’s worked before, and did so again after three tries&= #8230; During normal operation, my nose gear always extends and retracts first, with the mains being slower to both extend fully and to re= tract fully.

Bob

 

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