X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 25 Jul 2012 09:43:16 -0400 Message-ID: X-Original-Return-Path: Received: from mailout-us.mail.com ([74.208.122.35] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with SMTP id 5677000 for lml@lancaironline.net; Wed, 25 Jul 2012 09:13:01 -0400 Received-SPF: none receiver=logan.com; client-ip=74.208.122.35; envelope-from=cfi@instructor.net Received: (qmail invoked by alias); 25 Jul 2012 13:12:25 -0000 Received: from 184-88-232-154.res.bhn.net (EHLO [192.168.0.5]) [184.88.232.154] by mail.gmx.com (mp-us010) with SMTP; 25 Jul 2012 09:12:25 -0400 X-Authenticated: #73491717 X-Provags-ID: V01U2FsdGVkX19mHYEjrDZmAbbLhorR+wHhEB7ZomTsjYK4IN78mh cZ1uPgK2scRkHV Subject: Re: [LML] Re: Garmin G900X erratic EGTs References: From: Ron Galbraith Content-Type: multipart/alternative; boundary=Apple-Mail-5B69BBD2-0917-4D1A-9750-98845C284282 X-Mailer: iPhone Mail (9B206) In-Reply-To: X-Original-Message-Id: <02E699AA-1F1A-43F0-B676-66C85F17CBF5@instructor.net> X-Original-Date: Wed, 25 Jul 2012 09:12:23 -0400 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) X-Y-GMX-Trusted: 0 --Apple-Mail-5B69BBD2-0917-4D1A-9750-98845C284282 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii I'd suggest taking the GEA71 out of the rack, inspecting the pins both on ra= ck and in the GEA71, then resetting in the rack. I had a similar problem an= d just resetting the LRU solved the problem. That was over a year ago Ron Sent from my iPhone On Jul 25, 2012, at 8:09 AM, Charles Brown wrote: > That is a weird one. A 10-second take on it is: Alternator current and a= lternator field current is oscillating and creating noise in unshielded alte= rnator wires/cables. Replace regulator(s)? (the alternator lines are most= ly ahead of the firewall and noise generated there is unlikely to affect rad= ios, which are not only aft of the firewall, they're also shielded coaxes.) = My 2c worth. Good luck. >=20 > On Jul 24, 2012, at 6:57 AM, Clark Baker wrote: >=20 > I have a Garmin G900X in my Legacy. I have erratic EGT readings on all 6 (= in flight) They read around 100F low and are erratic in an about 200F rang= e. >=20 > All other temps and reading are fine. >=20 > The problem goes away completely when I shut off both alternators. (Shutti= ng off one does not do anything). No other electrical items have any effect= >=20 > Note-shutting the alternators off does Not have any effect on the stormsc= ope or radio noise (there is none)=20 >=20 > We replaced the GEA engine interface box. We replaced all EGT senders and c= ompletely redid all EGT wiring from probe to panel. We used thermocouple con= nectors. We added a second engine ground strap. We checked all grounds. >=20 > I do Not get any radio noise and reception is great. The WX500 is clear ou= t to 75 miles. >=20 > Garmin has not been much help. Has anyone encountered this or have any sug= gestions? We are at a loss. >=20 >=20 --Apple-Mail-5B69BBD2-0917-4D1A-9750-98845C284282 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

I'd suggest taking the GEA= 71 out of the rack, inspecting the pins both on rack and in the GEA71, then r= esetting in the rack. I had a similar problem and just resetting the L= RU solved the problem. That was over a year ago

Ron

Sent from my iPhone

On Jul 25, 2012, at 8:09 AM,= Charles Brown <browncc1@verizon.= net> wrote:

That is a weird one. A 10-second take on it is: Alternator cu= rrent and alternator field current is oscillating and creating noise in unsh= ielded alternator wires/cables. Replace regulator(s)? (the alte= rnator lines are mostly ahead of the firewall and noise generated there is u= nlikely to affect radios, which are not only aft of the firewall, they're al= so shielded coaxes.) My 2c worth. Good luck.

On Jul 24, 2012, at 6:57 AM, Clark Baker wrote:

I have a Garmin G900X in my Legacy. I have erratic EGT r= eadings on all 6 (in flight) They read around 100F low and are e= rratic in an about 200F range.
All other temps and reading are fine.<= /p>
The problem goes away completely when I shut off both alternators. (Sh= utting off one does not do anything). No other electrical items have a= ny effect
Note-shutting the alternators off does Not have any e= ffect on the stormscope or radio noise (there is none)
We repla= ced the GEA engine interface box. We replaced all EGT senders and completely= redid all EGT wiring from probe to panel. We used thermocouple connectors. W= e added a second engine ground strap. We checked all grounds.
I do Not= get any radio noise and reception is great. The WX500 is clear out to 75 mi= les.
Garmin has not been much help. Has anyone encountered this or= have any suggestions? We are at a loss.

= --Apple-Mail-5B69BBD2-0917-4D1A-9750-98845C284282--