Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Thu, 22 Apr 2004 00:45:31 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m21.mx.aol.com ([64.12.137.2] verified) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3183555 for lml@lancaironline.net; Wed, 21 Apr 2004 22:18:05 -0400 Received: from Sky2high@aol.com by imo-m21.mx.aol.com (mail_out_v37_r1.3.) id q.b9.3f5747db (4328) for ; Wed, 21 Apr 2004 22:18:01 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Wed, 21 Apr 2004 22:18:01 EDT Subject: Re: [LML] Strange Anomaly In EGT X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1082600281" X-Mailer: 9.0 for Windows sub 4060 -------------------------------1082600281 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 4/21/2004 8:48:57 PM Central Standard Time, Lee.Metcalfe@jocogov.org writes: I was reviewing the EDM data from some of my recent flights today and spotted a strange anomaly in the EGT traces on one flight. I have attached an MS Excel file with the raw data and two graphs of the data. In chart 1 I circled the anomaly. In chart 2 I zoomed in on the anomaly. This occurred about an hour into a 2.4 hr. cross-country in dead smooth air on a CAVU day. I'm quite sure I did not do anything with the engine controls or fuel system at this point in the flight. I was cruising on autopilot enjoying the view. I don't remember noticing anything unusual about the engine sounds or performance at any time during the cruise. Moondog, What's DIF - It spiked at the same time? (fuel flow, pressure?) Cyl temps dipped at the same time. EGTs took a dip, then spiked, then back to trend line. You didn't feel a cough? Bat stayed the same. HOw about a big bug swallowed by the induction system? How about some krud in the throttle body? How about a fuel flow hiccup? Usually these things only happen over water or at night.... Grayhawk -------------------------------1082600281 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 4/21/2004 8:48:57 PM Central Standard Time,=20 Lee.Metcalfe@jocogov.org writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I was=20 reviewing the EDM data from some of my recent flights today and
spotted= a=20 strange anomaly in the EGT traces on one flight. I have
attached=20= an=20 MS Excel file with the raw data and two graphs of the data.
In chart 1=20= I=20 circled the anomaly. In chart 2 I zoomed in on the
anomaly. = =20 This occurred about an hour into a 2.4 hr. cross-country in
dead smooth= air=20 on a CAVU day. I'm quite sure I did not do anything
with the engi= ne=20 controls or fuel system at this point in the flight. I
was cruisi= ng=20 on autopilot enjoying the view. I don't remember noticing
anythin= g=20 unusual about the engine sounds or performance at any time
during the=20 cruise.

Moondog,

What's DIF - It spiked at the same time? (fuel flow, pressure?)

Cyl temps dipped at the same time.

EGTs took a dip, then spiked, then back to trend line. You didn't= =20 feel a cough?

Bat stayed the same.

HOw about a big bug swallowed by the induction system? How about=20= some=20 krud in the throttle body? How about a fuel flow hiccup?

Usually these things only happen over water or at night....

Grayhawk

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