GS problem

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   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

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luchetto Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 10 Dec 2015 Location: Switzerland Status: Offline Points: 119	Post Options Post Reply Quote luchetto Report Post Thanks(0) Quote Reply Topic: GS problem 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

LANCE Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 06 Dec 2014 Location: TEXAS Status: Offline Points: 277	Post Options Post Reply Quote LANCE Report Post Thanks(0) Quote Reply 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/201 ... -525a-hsi/

George Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 08 Apr 2014 Location: 66Y Status: Offline Points: 82	Post Options Post Reply Quote George Report Post Thanks(0) Quote Reply 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.