X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 31 Mar 2011 12:43:57 -0400 Message-ID: X-Original-Return-Path: Received: from mail.glasair.org ([65.75.24.102] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTPS id 4928170 for lml@lancaironline.net; Thu, 31 Mar 2011 11:53:45 -0400 Received-SPF: none receiver=logan.com; client-ip=65.75.24.102; envelope-from=BGray@glasair.org Received: from gray1 by mail.glasair.org (VisNetic.MailServer.v9.1.4.1) with ESMTP id OSG02808 for ; Thu, 31 Mar 2011 11:53:08 -0400 From: "Bruce" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: LNC2 Hydraulic Landing Gear Pressure Switch Wear Issues X-Original-Date: Thu, 31 Mar 2011 11:53:07 -0400 X-Original-Message-ID: <08EF64A98DF74223BF61298D989A1ED0@gray1> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0097_01CBEF9A.335854A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0097_01CBEF9A.335854A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I=92m using Gigavac sealed relays that draw 280MA at 28v, 700MA at 14v. =20 Bruce WWW.Glasair.org=20 -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Bruce Sent: Tuesday, February 08, 2011 7:31 PM To: lml@lancaironline.net Subject: [LML] Re: LNC2 Hydraulic Landing Gear Pressure Switch Wear Issues =20 I would think that the amp draw of the control circuit, not the coils, is where to measure.=20 =20 Bruce WWW.Glasair.org=20 -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Bill Hannahan Sent: Tuesday, February 08, 2011 2:59 PM To: lml@lancaironline.net Subject: [LML] LNC2 Hydraulic Landing Gear Pressure Switch Wear Issues =20 Great idea, but my relay coils (vintage 1990 360) require 4 amps, tested today, perhaps 5 amps with engine running. We would need a power transistor to supply the required current. Anybody know of a similar PS with a 5A or greater rating? Regards, Bill Hannahan wfhannahan@yahoo.com --- On Mon, 2/7/11, Bruce wrote: From: Bruce Subject: [LML] Re: LNC2 Hydraulic Landing Gear Pressure Switch Wear Issues To: lml@lancaironline.net Date: Monday, February 7, 2011, 8:18 PM I would think that =BD amp at 14v should be enough. =20 Bruce WWW.Glasair.org=20 -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Sky2high@aol.com Sent: Monday, February 07, 2011 2:53 PM To: lml@lancaironline.net Subject: [LML] Re: LNC2 Hydraulic Landing Gear Pressure Switch Wear Issues =20 Their specs look great. Is the 500 mA current limitation adequate for operating clunky 12 VDC intermittent relays (the pump power switch relays)? =20 Grayhawk =20 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. =20 http://www.automationdirect.com/adc/Search/Search?searchquery=3DPSD25-OP-= 5 800H &cmd=3DSearch&fctype=3Dadc.falcon.search.SearchFormCtrl&TxnNumber=3D-1 =20 =20 Bruce WWW.Glasair.org=20 -----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 =20 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. =20 =20 =20 ------=_NextPart_000_0097_01CBEF9A.335854A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I’m using Gigavac sealed relays that draw 280MA at 28v, 700MA at = 14v.

 

Bruce
WWW.Glasair.org

-----Original = Message-----
From: Lancair Mailing = List [mailto:lml@lancaironline.net] On = Behalf Of Bruce
Sent: Tuesday, February = 08, 2011 7:31 PM
To: = lml@lancaironline.net
Subject: [LML] Re: LNC2 = Hydraulic Landing Gear Pressure Switch Wear Issues

 

I would think = that the amp draw of the control circuit, not the coils, is where to measure. =

 =

Bruce
WWW.Glasair.org

-----Original = Message-----
From: Lancair Mailing = List [mailto:lml@lancaironline.net] On = Behalf Of Bill Hannahan
Sent: Tuesday, February = 08, 2011 2:59 PM
To: = lml@lancaironline.net
Subject: [LML] LNC2 = Hydraulic Landing Gear Pressure Switch Wear Issues

 

Great idea, = but my relay coils (vintage 1990 360) require 4 amps, tested today, perhaps 5 amps = with engine running. We would need a power transistor to supply the = required current.

Anybody know of a similar PS with a 5A or greater = rating?

Regards,

Bill Hannahan



--- On Mon, 2/7/11, Bruce <BGray@glasair.org> wrote:


From: Bruce <BGray@glasair.org>
Subject: [LML] Re: LNC2 Hydraulic Landing Gear Pressure Switch Wear = Issues
To: lml@lancaironline.net
Date: Monday, February 7, 2011, 8:18 PM

I would think = that =BD amp at 14v should be enough.

 

Bruce
WWW.Glasair.org

-----Original Message-----
From: Lancair Mailing = List [mailto:lml@lancaironline.net] On = Behalf Of Sky2high@aol.com
Sent: Monday, February = 07, 2011 2:53 PM
To: = lml@lancaironline.net
Subject: [LML] Re: LNC2 Hydraulic Landing Gear Pressure Switch Wear = Issues

 

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?searchqu= ery=3DPSD25-OP-5800H&cmd=3DSearch&fctype=3Dadc.falcon.search.Sear= chFormCtrl&TxnNumber=3D-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.

 

 

 

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