X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 19 Dec 2011 13:45:10 -0500 Message-ID: X-Original-Return-Path: Received: from imr-db02.mx.aol.com ([205.188.91.96] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with ESMTP id 5310917 for lml@lancaironline.net; Mon, 19 Dec 2011 11:40:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.91.96; envelope-from=vtailjeff@aol.com Received: from mtaout-da03.r1000.mx.aol.com (mtaout-da03.r1000.mx.aol.com [172.29.51.131]) by imr-db02.mx.aol.com (8.14.1/8.14.1) with ESMTP id pBJGdeHv029282 for ; Mon, 19 Dec 2011 11:39:40 -0500 Received: from [10.16.150.63] (mobile-166-147-080-254.mycingular.net [166.147.80.254]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mtaout-da03.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id 32CF2E0000FF; Mon, 19 Dec 2011 11:39:36 -0500 (EST) References: In-Reply-To: Mime-Version: 1.0 (iPad Mail 8L1) Content-Type: multipart/alternative; boundary=Apple-Mail-1-260707674 X-Original-Message-Id: Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (8L1) From: vtailjeff@aol.com Subject: Re: [LML] Re: MGL back up instrumentr X-Original-Date: Mon, 19 Dec 2011 08:39:27 -0800 X-Original-To: Lancair Mailing List x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:473763296:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33834eef68c805cd X-AOL-IP: 166.147.80.254 --Apple-Mail-1-260707674 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 John, I am in Brent's camp on this. I would use mechanical backups for an EFIS sys= tem. An electrical failure would probably leave you without main or backup i= nstruments unless you have true electrical redundancy. =20 Just my 2 cents. Jeff Sent from my iPad On Dec 19, 2011, at 7:00 AM, "John Barrett" wrote: > Good question, Jeff. Some more naturally follow: >=20 > =20 >=20 > 1. Are you stating my backup instruments are unreliable? >=20 > 2. If so, what do you find unreliable about them? >=20 > 3. Assuming they are unreliable, what would you replace them with? >=20 > =20 >=20 > I guess the real question is what instrument that gives airspeed or altitu= de will never fail to provide needed information under any circumstance? >=20 > =20 >=20 > =20 >=20 > From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Jef= f Edwards > Sent: Sunday, December 18, 2011 6:30 AM > To: lml@lancaironline.net > Subject: [LML] Re: MGL back up instrumentr >=20 > =20 >=20 > Why have unreliable backups?=20 >=20 > AvSafe=20 >=20 > Jeff Edwards >=20 > 314.308.6719 mobile >=20 > 636.532.5638 office >=20 > Jeff.edwards@avsafe.com >=20 >=20 > On Dec 16, 2011, at 8:44 AM, "John Barrett" wrote:= >=20 > Infinity line MGL instruments =E2=80=93 they are intriguing as back up gau= ges.=20 >=20 > =20 >=20 > Looks like the altimeter is Baro sensitive for input but needs electrons f= or output. I spoke with Matt at their US distributor center and learned tha= t it uses pitot static inputs to pressure sensors that generate output data f= or microprocessor to turn into altitude readout.=20 >=20 > =20 >=20 > Without electricity the gauge does not function, losing the microprocessin= g component as well as the LCD display output. Does this mean that in order= to have good backup one would need to have a totally mechanical altimeter?= >=20 > =20 >=20 > Have found that two of my cheap 2.25=E2=80=9D gauges are failed with case l= eaks. Have had them awhile but as far as I know they haven=E2=80=99t been m= ishandled. I know the airspeed gauge is UMA. I suspect the altimeter is th= e same brand. These are the two failed instruments. >=20 > =20 >=20 > Advice welcome. >=20 > =20 >=20 > John Barrett >=20 > =20 >=20 > =20 >=20 > =20 >=20 > =20 >=20 > =20 >=20 > Regards, >=20 > =20 >=20 > John Barrett, CEO >=20 > Leading Edge Composites >=20 > PO Box 428 >=20 > Port Hadlock, WA 98339 >=20 > =20 >=20 > www.carbinge.com >=20 > =20 --Apple-Mail-1-260707674 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
John,

I am in B= rent's camp on this. I would use mechanical backups for an EFIS system. An e= lectrical failure would probably leave you without main or backup instrument= s unless you have true electrical redundancy.  

Just my 2 cents.

Jeff

Sent from my iPad

On Dec 19, 2011, at 7:00 AM, "John Barrett" <jbarrett@carbinge.com> wrote:

<= div>

Good question, Jeff.  Some mo= re naturally follow:

 

= 1.       Are you stating my backup instruments are unreliable?

2.  =      If s= o, what do you find unreliable about them?

3.       Assuming they are unreliable, what= would you replace them with?

 

<= span style=3D"font-size:11.0pt;font-family:"Calibri","sans-se= rif";color:#1F497D">I guess the real question is what instrument that g= ives airspeed or altitude will never fail to provide needed information unde= r any circumstance?

 

 

From: Lancair Mailing List [ma= ilto:lml@lancaironline.net] On Behalf Of Jeff Edwards
Sent:= Sunday, December 18, 2011 6:30 AM
To: lml@lancaironline.net=
Subject: [LML] Re: MGL back up instrumentr

 

Why have unreliable backups?&n= bsp;

AvSafe 

Jeff Edwards

314.308.6719 mobile

63= 6.532.5638 office


On Dec 16, 2011, at 8:44 AM, "J= ohn Barrett" <jbarrett@carbinge.com> wrote:

Infinity line MGL instruments =E2=80=93 they are intriguing as back= up gauges. 

 

Looks l= ike the altimeter is Baro sensitive for input but needs electrons for output= .  I spoke with Matt at their US distributor center and learned that it= uses pitot static inputs to pressure sensors that generate output data for m= icroprocessor to turn into altitude readout. 

&nb= sp;

Without electricity the gauge does not function, l= osing the microprocessing component as well as the LCD display output. = Does this mean that in order to have good backup one would need to have a t= otally  mechanical altimeter?

 

Have found that two of my cheap 2.25=E2=80=9D gauges are failed wi= th case leaks.  Have had them awhile but as far as I know they haven=E2= =80=99t been mishandled.  I know the airspeed gauge is UMA.  I sus= pect the altimeter is the same  brand.  These are the  two fa= iled instruments.

 

Advice w= elcome.

 

John Barrett=

 

 

=  

 

 <= /p>

Regards,

 

John B= arrett, CEO

Leading Edge Composites

PO Box 428

Port Hadlock, WA 98339

 

www.carbinge.com

 

= --Apple-Mail-1-260707674--