X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 07 Feb 2011 14:52:49 -0500 Message-ID: X-Original-Return-Path: Received: from imr-mb01.mx.aol.com ([64.12.207.164] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTP id 4841125 for lml@lancaironline.net; Mon, 07 Feb 2011 13:03:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.207.164; envelope-from=Sky2high@aol.com Received: from imo-ma02.mx.aol.com (imo-ma02.mx.aol.com [64.12.78.137]) by imr-mb01.mx.aol.com (8.14.1/8.14.1) with ESMTP id p17I2UC4008862 for ; Mon, 7 Feb 2011 13:02:30 -0500 Received: from Sky2high@aol.com by imo-ma02.mx.aol.com (mail_out_v42.9.) id q.d17.64e3106c (37522) for ; Mon, 7 Feb 2011 13:02:27 -0500 (EST) Received: from magic-d22.mail.aol.com (magic-d22.mail.aol.com [172.19.155.138]) by cia-ma08.mx.aol.com (v129.8) with ESMTP id MAILCIAMA087-92924d5033b2201; Mon, 07 Feb 2011 13:02:26 -0500 From: Sky2high@aol.com X-Original-Message-ID: <51113.65171dbe.3a818db2@aol.com> X-Original-Date: Mon, 7 Feb 2011 13:02:26 EST Subject: Re: [LML] Re: LNC2 Hydraulic Landing Gear Pressure Switch Wear Issues X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_51113.65171dbe.3a818db2_boundary" X-Mailer: AOL 9.5 sub 5400 X-AOL-IP: 24.15.17.119 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com --part1_51113.65171dbe.3a818db2_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Their specs look great. Is the 500 mA current limitation adequate for operating clunky 12 VDC intermittent relays (the pump power switch relays)? Grayhawk In a message dated 2/7/2011 11:32:18 A.M. Central Standard Time, BGray@glasair.org writes: Several of our guys (including me) have junked our mechanical pressure switches and moved to solid state adjustable switches. _http://www.automationdirect.com/adc/Search/Search?searchquery=PSD25-OP-5800 H&cmd=Search&fctype=adc.falcon.search.SearchFormCtrl&TxnNumber=-1_ (http://www.automationdirect.com/adc/Search/Search?searchquery=PSD25-OP-5800H&cmd=Sea rch&fctype=adc.falcon.search.SearchFormCtrl&TxnNumber=-1) Bruce WWW.Glasair.org -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Don Gordon Sent: Monday, February 07, 2011 7:45 AM To: lml@lancaironline.net Subject: [LML] LNC2 Hydraulic Landing Gear Pressure Switch Wear Issues I have recently replaced both my high pressure and low pressure switches in the hydraulic system for the landing gear. These switches began to have trouble providing a positive and discrete on/off event when the hydraulic pressure reached the prescribed limits. I began to hear strange crackling and static noises in my headset just prior to the hydraulic pump running (though it would just run for a fraction of a second to re-pressurize). These strange sounds in my headset began to occur longer and longer prior to the pump tripping on. I also began to notice some other odd electrical issues with the aircraft. Finally, I began to suspect these switches were faulty are replaced both of them. The problem went away and so did my electrical issues I experienced. --part1_51113.65171dbe.3a818db2_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Their specs look great.  Is the 500 mA current limitation adequa= te for=20 operating clunky 12 VDC intermittent relays (the pump power switch=20 relays)?
 
Grayhawk
 
In a message dated 2/7/2011 11:32:18 A.M. Central Standard Time,=20 BGray@glasair.org writes:

Several of our= guys=20 (including me) have junked our mechanical pressure switches and moved to= solid=20 state adjustable switches.

 

http://www.automationdirect.com/adc/= Search/Search?searchquery=3DPSD25-OP-5800H&cmd=3DSearch&fctype=3Da= dc.falcon.search.SearchFormCtrl&TxnNumber=3D-1

 

 

Bruce
WWW.Glasair.= org=20

-----Origin= al=20 Message-----
From: La= ncair=20 Mailing List [mailto:lml@lancaironline.net] On Behalf Of Don Gordon
Sent: Monday, February 07, 2011 7:45=20 AM
To:=20 lml@lancaironline.net
Subject= : [LML] LNC2 Hydraulic Landing=20 Gear Pressure Switch Wear Issues

 =

I have recently replaced both= my high pressure and low=20 pressure switches in the hydraulic system for the landing gear.  Th= ese=20 switches began to have trouble providing a positive and discrete on/off= event=20 when the hydraulic pressure reached the prescribed limits.  I began= to=20 hear strange crackling and static noises in my headset just prior to the= =20 hydraulic pump running (though it would just run for a fraction of a sec= ond to=20 re-pressurize).  These strange sounds in my headset began to occur= longer=20 and longer prior to the pump tripping on.  I also began to notice= some=20 other odd electrical issues with the aircraft.  Finally, I began to= =20 suspect these switches were faulty are replaced both of them.  The= =20 problem went away and so did my electrical issues I=20 experienced.

 =

 =

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