IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM

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GS problem

Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=1372
Printed Date: 01 May 2024 at 7:23am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: GS problem

Posted By: luchetto
Subject: GS problem
Date Posted: 18 Aug 2017 at 6:13pm

I have recently experienced a slow dying of the GS signal on my King HSI. It started with an intermittant mulfunction where on one flight the GS would come alive and then the next flight it would take much longer or not appear at all.

I had the HSI checked and a few capacitors were exchanged. On the bench the HSI works but in the airplane I still have the same issues. The HSI failes the self-test when turning on the Avidyne 540.

What could be the most likely cause, the Avidyne box

Replies:

Posted By: LANCE
Date Posted: 18 Aug 2017 at 6:22pm

I doubt it's the Avidyne. You might read through this and see if this describes what you are experiencing:

https://miscsolutions.wordpress.com/2011/06/05/what-you-probably-didnt-know-about-the-bendix-king-ki-525a-hsi/" rel="nofollow - https://miscsolutions.wordpress.com/201 ... -525a-hsi/

Posted By: George
Date Posted: 18 Aug 2017 at 10:25pm

That article covers my problem with the KI525 exactly. Shops don't or can't

fix the problem. Part of the approach procedure is to tap the face of the instrument

and all is good til the next flight. I personally think it is the magnet adjustment.

The suggestion of low voltage sounds reasonable also. The maintenance manuals that are downloadable in the article are worth the read.