X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 26 Oct 2011 06:21:22 -0400 Message-ID: X-Original-Return-Path: Received: from smtp1.av-mx.com ([137.118.16.57] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with ESMTP id 5172771 for lml@lancaironline.net; Tue, 25 Oct 2011 21:42:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.57; envelope-from=pinetownd@volcano.net Received: from DennisPC (unknown [65.170.223.130]) (Authenticated sender: pinetownd@volcano.net) by smtp1.av-mx.com (Postfix) with ESMTP id C2E4A291A22 for ; Tue, 25 Oct 2011 21:42:22 -0400 (EDT) X-Original-Message-ID: <3FC6D63560A349A4AF9DFEE461343E88@DennisPC> From: "Dennis Johnson" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: [LML] Re: Problem with Fluctuating Amperage X-Original-Date: Tue, 25 Oct 2011 18:42:29 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_064B_01CC9345.D98FD3D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_064B_01CC9345.D98FD3D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable If the voltage is steady at 13.8 while the amperage is fluctuating from = plus 15 amps to minus 50 amps, then either the voltmeter is broken or = the amperage reading is incorrect. My guess is the amperage reading is = wrong. Is there some kind of electromagnetic interference that is = causing the amp reading and the fuel gauges to go haywire at the same = time? Is the hydraulic pump cycling every five minutes and doing this? = I don't think hydraulic pumps are common antagonists, but I can't think = of anything else that might cycle every five minutes. It's always a = good idea to check grounds, but my guess is EMI. Interesting problem! Dennis ----- Original Message -----=20 From: Taylor, David=20 To: lml@lancaironline.net=20 Sent: Tuesday, October 25, 2011 6:00 PM Subject: [LML] Re: Problem with Fluctuating Amperage Voltage reads steady at 13.8 volts. Amp drop is on the EIS unit, so = the EFIS unit is not the cause. Good idea on downloading data. =20 Dave T. =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Dennis Johnson Sent: 10-25-11-Tue 14:01 To: lml@lancaironline.net Subject: [LML] Re: Problem with Fluctuating Amperage =20 Hi David, =20 What is the voltage reading during this time? Does the Grand Rapids = EFIS Sport record data that you can download and study after a flight? =20 =20 Dennis Legacy 450 hours ----- Original Message -----=20 From: Taylor, David=20 To: lml@lancaironline.net=20 Sent: Tuesday, October 25, 2011 4:50 AM Subject: [LML] Problem with Fluctuating Amperage =20 Any ideas about what would cause my amperage to start fluctuating = wildly about 5 minutes into a flight?=20 It starts out fine after takeoff at 15 amps and then goes to -50 = amps for 30 seconds, and then gyrates between 5 amps and -50 amps for a = minute and then goes back to normal. It repeats this sequence every 5 = minutes.=20 My fuel gages also go down to zero during this episode and then back = to normal. Is my B&C LR3C Linear Regulator going bad?=20 (I'm getting these readings from my Grand Rapids EIS engine monitor. = It's hooked up to a Grand Rapids EFIS Sport.) Thanks for the help! David T. Legacy RG =20 ------=_NextPart_000_064B_01CC9345.D98FD3D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
If the voltage is steady at 13.8 while the amperage is fluctuating = from=20 plus 15 amps to minus 50 amps, then either the voltmeter is broken or = the=20 amperage reading is incorrect.  My guess is the amperage reading is = wrong.  Is there some kind of electromagnetic interference that is = causing=20 the amp reading and the fuel gauges to go haywire at the same = time?  Is the=20 hydraulic pump cycling every five minutes and doing this?  I don't = think=20 hydraulic pumps are common antagonists, but I can't think of anything = else that=20 might cycle every five minutes.  It's always a good idea to check = grounds,=20 but my guess is EMI.
 
Interesting problem!
 
Dennis
----- Original Message -----
From:=20 Taylor, David
Sent: Tuesday, October 25, 2011 = 6:00=20 PM
Subject: [LML] Re: Problem with = Fluctuating Amperage

Voltage reads = steady at 13.8=20 volts.  Amp drop is on the EIS unit, so the EFIS unit is not the=20 cause.  Good idea on downloading data.

 

Dave = T.

 

From: Lancair = Mailing=20 List [mailto:lml@lancaironline.net] On Behalf Of Dennis=20 Johnson
Sent: 10-25-11-Tue 14:01
To: lml@lancaironline.net
Sub= ject:=20 [LML] Re: Problem with Fluctuating = Amperage

 

Hi=20 David,

 

What = is the=20 voltage reading during this time?  Does the Grand Rapids EFIS = Sport=20 record data that you can download and study after a flight? =20

 

Dennis

Legacy 450=20 hours

----- = Original=20 Message -----

From: Taylor, David=20

To: lml@lancaironline.net=20

Sent: = Tuesday, October=20 25, 2011 4:50 AM

Subject: [LML] = Problem=20 with Fluctuating Amperage

 

Any ideas about what would cause my amperage to = start=20 fluctuating wildly about 5 minutes into a flight?

It starts = out fine=20 after takeoff at 15 amps and then goes to -50 amps for 30 seconds, = and then=20 gyrates between 5 amps and -50 amps for a minute and then goes back = to=20 normal. It repeats this sequence every 5 minutes.

My fuel = gages also=20 go down to zero during this episode and then back to = normal.

Is my=20 B&C LR3C Linear Regulator going bad?

(I'm getting these = readings=20 from my Grand Rapids EIS engine monitor. It's hooked up to a Grand = Rapids=20 EFIS Sport.)

Thanks for the help!

David T.
Legacy=20 RG

 

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