X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 21 Oct 2009 07:47:33 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma04.mx.aol.com ([64.12.206.42] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3892326 for lml@lancaironline.net; Tue, 20 Oct 2009 10:09:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.42; envelope-from=Mquinns@aol.com Received: from imo-ma01.mx.aol.com (imo-ma01.mx.aol.com [64.12.78.136]) by imr-ma04.mx.aol.com (8.14.1/8.14.1) with ESMTP id n9KE8ewp029226 for ; Tue, 20 Oct 2009 10:08:40 -0400 Received: from Mquinns@aol.com by imo-ma01.mx.aol.com (mail_out_v42.5.) id q.c07.6c13f0c1 (37031) for ; Tue, 20 Oct 2009 10:08:37 -0400 (EDT) Received: from smtprly-db03.mx.aol.com (smtprly-db03.mx.aol.com [205.188.249.154]) by cia-db02.mx.aol.com (v125.7) with ESMTP id MAILCIADB021-5c3e4addc461260; Tue, 20 Oct 2009 10:08:35 -0400 Received: from webmail-m023 (webmail-m023.sim.aol.com [64.12.183.105]) by smtprly-db03.mx.aol.com (v125.7) with ESMTP id MAILSMTPRLYDB034-5c3e4addc461260; Tue, 20 Oct 2009 10:08:33 -0400 References: X-Original-To: lml@lancaironline.net Subject: Re: [LML] Re: LNC2 Hydraulic Gear Operation Fix X-Original-Date: Tue, 20 Oct 2009 10:08:33 -0400 X-AOL-IP: 12.25.110.30 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: mquinns@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CC1FA5F1717E77_8330_38DB6_webmail-m023.sysops.aol.com" X-Mailer: AOL Webmail 28702-STANDARD Received: from 12.25.110.30 by webmail-m023.sysops.aol.com (64.12.183.105) with HTTP (WebMailUI); Tue, 20 Oct 2009 10:08:33 -0400 X-Original-Message-Id: <8CC1FA5F15E737F-8330-1BDBF@webmail-m023.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: Mquinns@aol.com ----------MB_8CC1FA5F1717E77_8330_38DB6_webmail-m023.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" Randy, What kind of environment gets the pressure that high? I would suppose= constant cycling of the unit would things up or pressures need to be adju= sted per recommendations but summer heat is not likely the issue. My 360= is in Florida (yes it is hot) and my hydraulic pump if forward of the fir= ewall. That is about ten inches from exhaust pipes and the most heat influ= ence seen has been about 250 psi higher on both sides (gauge readings abou= t 950 low side and 1400 high side). If they go higher, the adjustment is= turned lower half a turn but that has only happen once and it was not muc= h higher. The pump unit is not shielded or insulated although the two line= s are heat wrapped where they pass six inches from the exhaust pipe. My pu= mp unit is original (vintage 1998) and has the squarish reservoir. I think= the manual specs 550 psi low side and 1100 psi high side. Something else= must be wrong for pressures that high. Mark Quinn LNC2 (175 hours) -----Original Message----- From: Randy To: lml@lancaironline.net Sent: Mon, Oct 19, 2009 1:37 pm Subject: [LML] Re: LNC2 Hydraulic Gear Operation Fix This looks like a relay that when it senses the Hi pressure switch being= open, while the gear is up, shorts and closes the Lo pressure circuit. Th= is will bypass the Lo pressure sensor when the sensor opens from the hydra= ulic fluid expanding. This type of fix does not stop the hydraulic fluid= from expanding more and more as it heats up. The hydraulic fluid expansio= n can damage the hydraulic system. I have monitored this problem and have= seen the Lo side exceed 2000 psi during this heat expansion in the summer= months.=20 If this relay sticks the Lo sensor circuit will be on all the time regardl= ess of the pressure sensor.=20 The ONLY way to approach this work around for the Oildyne pump problem is= to REMOVE the pressure from the Lo side. Relieving the expanding hydrauli= c fluid and put it back in the reservoir where it belongs!!!!=20 This type of "Fix" that simply bypasses the open Lo sensor and does not re= lieve the expanding hydraulic fluid is insane and it's a ticking time bomb= for gear failure!!!=20 =20 Randy Stuart=20 LNC-2=20 =20 =20 =20 ----- Original Message ----- From: "Lorn H Olsen" =20 To: =20 Sent: Monday, October 19, 2009 6:18 AM=20 Subject: [LML] LNC2 Hydraulic Gear Operation Fix=20 =20 >A module to fix the gear operation failure problem in the LNC2 using=20 > the standard hydraulic system is now available.=20 >=20 > The problem occurs when thermal expansion has caused both HI and LO=20 > pressure switches to trip rendering the landing gear hydraulic pump=20 > incapable of operating.=20 >=20 > This module will activate the hydraulic pump motor in the direction=20 > selected by the gear switch when both pressure switches have been=20 > tripped by high pressure thereby relieving the pressure in the=20 > offending side.=20 >=20 > The module is 2.5" x 1.5" x .75", weighs 2.3 oz. and has two pairs of=20 > leads that connect directly to each pressure switch with 1/4" spade=20 > terminals. No other wiring is necessary. Price is $250.00 each. Simple= =20 > installation instructions included.=20 >=20 > Contact Wolfgang at 248-471-2000 or Wolfgang@MiCom.net=20 >=20 >=20 =20 --------------------------------------------------------------------------= ------=20 =20 >=20 >=20 >=20 =20 --------------------------------------------------------------------------= ------=20 =20 >=20 > --=20 > Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst=20 > DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us=20 > LNC2, FB90/92, O-320-D1F, 1,650 hrs, N31161, Y47, SE Michigan=20 >=20 >=20 =20 --------------------------------------------------------------------------= ------=20 =20 > --=20 > For archives and unsub > http://mail.lancaironline.net:81/lists/lml/List= .html=20 > =20 --=20 For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l=20 ----------MB_8CC1FA5F1717E77_8330_38DB6_webmail-m023.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii"
Randy,
   What kind of environment gets the pressure that high? I= would suppose constant cycling of the unit would things up or pressures= need to be adjusted per recommendations but summer heat is not likely the= issue. My 360 is in Florida (yes it is hot) and my hydraulic pump if forw= ard of the firewall. That is about ten inches from exhaust pipes and the= most heat influence seen has been about 250 psi higher on both sides (gau= ge readings about 950 low side and 1400 high side). If they go higher, the= adjustment is turned lower half a turn but that has only happen once and= it was not much higher. The pump unit is not shielded or insulated althou= gh the two lines are heat wrapped where they pass six inches from the exha= ust pipe. My pump unit is original (vintage 1998) and has the squarish res= ervoir. I think the manual specs 550 psi low side and 1100 psi high= side. Something else must be wrong for pressures that high.
 
Mark Quinn
LNC2 (175 hours)


-----Original Message-----
From: Randy <randystuart@hotmail.com>
To: lml@lancaironline.net
Sent: Mon, Oct 19, 2009 1:37 pm
Subject: [LML] Re: LNC2 Hydraulic Gear Operation Fix

This looks like a relay that when it= senses the Hi pressure switch being open, while the gear is up, shorts an= d closes the Lo pressure circuit. This will bypass the Lo pressure sensor= when the sensor opens from the hydraulic fluid expanding. This type of fi= x does not stop the hydraulic fluid from expanding more and more as it hea= ts up. The hydraulic fluid expansion can damage the hydraulic system. I ha= ve monitored this problem and have seen the Lo side exceed 2000 psi during= this heat expansion in the summer months. 
If this relay sticks the Lo sensor circuit will be on all the time regardl= ess of the pressure sensor. 
The ONLY way to approach this work around for the Oildyne pump problem is= to REMOVE the pressure from the Lo side. Relieving the expanding hydrauli= c fluid and put it back in the reservoir where it belongs!!!! 
This type of "Fix" that simply bypasses the open Lo sensor and does not re= lieve the expanding hydraulic fluid is insane and it's a ticking time bomb= for gear failure!!! 
 
Randy Stuart 
LNC-2 
 
 
 
----- Original Message ----- From: "Lorn H Olsen" <lorn@dynacomm.us> 
To: <lml@lancaironline.net= > 
Sent: Monday, October 19, 2009 6:18 AM 
Subject: [LML] LNC2 Hydraulic Gear Operation Fix 
 
>A module to fix the gear operation failure problem in the LNC2 using&n= bsp;
> the standard hydraulic system is now available. 
> 
> The problem occurs when thermal expansion has caused both HI and LO&n= bsp;
> pressure switches to trip rendering the landing gear hydraulic pump&n= bsp;
> incapable of operating. 
> 
> This module will activate the hydraulic pump motor in the direction&n= bsp;
> selected by the gear switch when both pressure switches have been&nbs= p;
> tripped by high pressure thereby relieving the pressure in the <= br> > offending side. 
> 
> The module is 2.5" x 1.5" x .75", weighs 2.3 oz. and has two pairs of=  
> leads that connect directly to each pressure switch with 1/4" spade&n= bsp;
> terminals. No other wiring is necessary. Price is $250.00 each. Simpl= e 
> installation instructions included. 
> 
> Contact Wolfgang at 248-471-2000 or Wolfgang@MiCom.net 
> 
> 
 
--------------------------------------------------------------------------= ------ 
 
> 
> 
> 
 
--------------------------------------------------------------------------= ------ 
 
> 
> -- 
> Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst 
> DynaComm, Corp., 248-345-0500, m= ailto:lorn@dynacomm.us 
> LNC2, FB90/92, O-320-D1F, 1,650 hrs, N31161, Y47, SE Michigan  > 
> 
 
--------------------------------------------------------------------------= ------ 
 
> -- 
> For archives and unsub > http://mail.lancaironline.net:81/l= ists/lml/List.html 
>  
-- 
For archives and unsub http://mail.lancaironline.net:81/lists/lml/L= ist.html 
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