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EGT Probes

Printed From: Avidyne
Category: Avidyne General
Forum Name: EX-Series Multi-Function Displays
Forum Description: Topics related to the Avidyne EX500, EX600, and EX5000 Multi-Function Displays (MFDs)
URL: https://avidynelive.com/forum_posts.asp?TID=272
Printed Date: 26 Mar 2026 at 2:12pm
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com


Topic: EGT Probes
Posted By: jsamford
Subject: EGT Probes
Date Posted: 30 Apr 2013 at 3:49am
I recently had a failure of the #4 EGT probe and had a mechanic replace it. After about 30 hours of flying, the same probe failed again. After again replacing it, I had a third failure after about three hours of flying. Finally, a few minutes later, the entire EGT display on the MFD stopped working.

A little online research showed part of the problem. I found Piper "Service Spares Letter 428A" where new EGT thermocouplers were made available for my Piper 6X. My mechanic had no idea these were not generic  "Type K" probes. While we need to now replace the #4 probe with the correct Piper part, I am curious what would cause the complete failure of all EGT readouts. Would this have been caused by using the wrong EGT probe on #4 or is this an unrelated wiring or MFD issue? And should this be handled by an avionics shop or mechanic?


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