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There are no direct replacement options for the KMA-20. If you are looking for a relatively inexpensive audio panel to replace it, I would recommend the Garmin GMA-340 or BendixKing KMA-24. The KMA-24 is getting up there in age as well but still supported. The GMA-340 is a little newer but one...

I'm not sure who said that their opinion is of the "most value" and perhaps that is not completely true. In any case, there are many qualified people at quite a few shops who are willing to assist and provide information on the front end well before being compensated for their time.

The certified G5 can currently only replace an attitude indicator or a turn coordinator. On the experimental version, it can do more - HSI/backup display/LPV glide paths etc. Most likely, Garmin will have additional certification approvals and more features forthcoming.

Well then that's just bad business practice. I can't imagine that any shop doesn't know by now the access everyone has to shop quotes around.

That's a fair price for the upgrade and should be what is in line for other shops to charge as well. No idea why someone would quote you $10000 unless they just didn't want the job.

Agree. No one should invest that sort of money in a 30+ year old radio. Time to upgrade!

No offense but there are piles of these out there at most shops who do mods and I don't know why someone would want to invest money in one even if they had one in their panel. The only way to keep them going is to cannibalize other units and I can tell you most shops don't want to work on them...

A very cheap option is the old KNI-520 which I've seen with the Garmin navigators. You can find them $500 and below but they are a risk since King no longer supports them with most service parts if they break.

I agree with that. The TSOd G5 that with the AML STC is $2149 retail.

Keep in mind the SN3308 display is no longer supported by Sandel. If you go the EHSI route, look at their SN3500 instead. Still supported and you can find used, certified units out there on the market.

Both indicators are good as long as you can get a KI-206 above SN 10000. Older KI-206s were made with a internal plastic frame. They can break even in shipping. I've pulled KI-206s from boxes with the OBS floating around loose inside. Later production KI-206s were manufactured with a metal...

The answer to your question depends on what transponder you currently have. That is, if you don't have a transponder that can be upgraded to ES like the GTX-330 or 33 then the GTX-345 w/ GPS is an ideal solution. Obviously, if you do have a transponder that can be upgraded to ES, then I would...

You need a power 'booster' so to speak. Ameri-King used to make the AK550 for this purpose. The FAA shut them down and they are out of business but I've used these converters before for this purpose and they are OK. You can probably find one on EBay for a few hundred bucks or cheaper. They made...

Google "portable HF" and you will get an idea of what an HF radio that can transmit farther distances. Icom and Yaesu makes some lesser expensive amateur radios that are used for these purposes. The trick with HF is the length the antenna has to be. Traditionally, aircraft use a long wire that...