Created Date: 4/30/2004 8:12:17 AM. Narco Avionics AT-150 TSO Transponder. Installation Manual. Narco Avionics Fort Washington, Pennsylvania, 19034, USA. December 1976. This material scanned from the original Narco installation manual listed above. Narco AT 150 Transponder TSO. Condition is for parts or not working, however this unit worked when removed, just the IDENT button is broken & stuck on. The faceplate lettering is a little faded. Likely the new buyer should get this repaired/overhauled before use. This is an excellent deal. In support of the Narco Avionics AT155 TSO Transponder, this manual provides detailed installation and operation procedures. 'This manual is intended for use only by persons qualified to service equipment in this manual pursuant to current regulatory requirements.' 1.1.1 Manual Organization. The FAA is adopting a new airworthiness directive (AD) for certain serial numbers (SNs) of NARCO Avionics Inc. AT150 transponders. This AD requires modification to the transponder by adding a resistor and transistor to the circuit board. This AD results from reports of AT150 transponders not.
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