Manual needed Edo-Aire RT-557 Transponder

Manual needed Edo-Aire RT-557 Transponder

My 1973 M4 Maule has an Edo-Aire RT-557 transponder. This model sits in a standard 3 1/4" instrument hole. Most of my flying is in isolated areas with no need for Mode C. However, there are times when I do venture into the Big City. I would like to add an encoder to the RT-557, but have been unable to find a manual or any other info on this model.

Anyone out there with info, I would sure appreciate it. I'll gladly pay for a photocopy or any other help.

Thank you.
Glenn

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Re: Manual needed Edo-Aire RT-557 Transponder

I guess I should be more specific. Does anyone know if the pinouts for the RT-667 or RT-777 are the same as the RT-557? Perhaps someone may even know the pinout for the RT-557.
Thanks again for any help.

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Re: Manual needed Edo-Aire RT-557 Transponder

Glenn

Had you tried this site for pinout info. Its about $15.

http://www.avionix.com/manuals.html

Bill

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Re: Manual needed Edo-Aire RT-557 Transponder

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Re: Manual needed Edo-Aire RT-557 Transponder

   I replaced an obsolete encoder with an ack encoder recently. the king transponder had the terminals listed on the insider cover. The ack came with directions for its side of the terminals. The information was enough to wire it correctly. Open it up and look! Rc

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Re: Manual needed Edo-Aire RT-557 Transponder

Thanks to all that responded and helped with information. I managed to find a service manual for an RT667 that has the same pinout info. Now I can "legally" fly into the BIG CITY airstrips. By the way, they wrecked their grass and had to replace in with asphalt. Gee, and I worry about dandelions...
Glenn

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Re: Manual needed Edo-Aire RT-557 Transponder

But are you really legal?
Altimeter ? Encoder correspondence ? TSO ? Ramp check per FAR's 43? 

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Re: Manual needed Edo-Aire RT-557 Transponder

Please, how I can get the internal diagram circuit of the EDO AIRE RT777 Transponder or a copy of the manual. I will pay for it.

Thank you
Jorge V. Misa

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Re: Manual needed Edo-Aire RT-557 Transponder

Copies of the Edo-Aire RT777 Instruction Manual or Maintainance & Technical Manual are $39.00 from <http://www.esscoaircraft.com/category_s/1586.htm>.

ESSCO carries manuals for just about every airplane and piece of avionics equipment ever built.

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