Airworthiness Directive · Amendment 39-13586 · NARCO Avionics Inc. AT150 Transponders
NARCO Avionics Inc. AT150 Transponders
This AD applies to NARCO Avionics Inc. AT150 transponders with "Chassis Level A", serial numbers (SNs) 10000 through 12598 inclusive.
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 recognizing and responding properly to Mode S interrogations from Mode S ground stations and Traffic Alert and Collision Avoidance System (TCAS-II) airborne equipment. We are issuing this AD to prevent loss of aircraft airspace separation and the possibility of mid-air collision.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Appliances and equipment
