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#1
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Counter drum altimeter
Hello Larry.
I see a counter drum altimeter installed in your panel. Can you tell me what kind it is and if there is an STC for the installation. Rgds Troels Hansen 
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#2
09-09-08, 03:51 PM
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I don't know what kind it was.
It was an encoding altimeter, not all that uncommon. I am unaware of an STC for it, however, there was no 337 form for it. Kollsman makes one, that is both in. hg, and millibars http://www.kollsman.com/downloads/28007.pdf Most people use simple altitude encoders, today.
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#3
09-09-08, 04:01 PM
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Counter drum altimeter
Thank you for your answer.
The reason I ask is that counter drum altimeters are required for commercial operation in Europe. Rgds Troels Hansen
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#4
09-09-08, 09:04 PM
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Troels,
the altimeter is an ARC EA-401A, it was a factory option on Skymasters. The full part number is 42540-3128. It is a servoed electric altimeter/encoder. The altimeter part works just fine, the encoder part can be troublesome, and expensive to fix. They are pretty common encoding altimeters and it shouldn't be too hard to find one and no problem to install since it could be ordered that way from the factory. If you use one of these altimeters, you have to have a non-electric altimeter as a backup in case of an electrical failure, probably just keeping the altimeter you already have as the #2. I have a repairable core if you are desperate, but it will be expensive to fix I would guess.
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