Airworthiness Directive · Amendment 39-10637 · AlliedSignal Inc. KT 76A Air Traffic Control (ATC) Transponders
AlliedSignal Inc. KT 76A Air Traffic Control (ATC) Transponders
AlliedSignal KT 76A Air Traffic Control (ATC) transponders; part number (P/N) 066-1062-00/10/02; serial numbers 93,000 through 109,999, as installed on, but not limited to the following airplanes (all serial numbers), certificated in any category: Cessna Aircraft Company: 172, 182, R182, T182, 06, P206, U206, TP206, 210, T210, P210, 310, 310, T310, and 421 series airplanes. Twin Commander Aircraft Company: 500, 520, 560, 680, 681, 685, 690, 695, and 720 series airplanes. The New Piper Aircraft Corporation: PA-31, PA-32, and PA-34 series airplanes. Raytheon Aircraft Company: E33, F33, G33, 35, J35, K35, L35, K35, M35, P35, S35, V35, 36, A26, B36, D55, E55, 56, A56, 58, 58A, 95, B95, D95, and E95 series airplanes. Mooney Aircraft Corporation: M20 series airplanes. McDonnell Douglas Helicopter Company: Model 500N rotorcraft.
This amendment adopts a new airworthiness directive (AD) that applies to certain AlliedSignal Inc. (AlliedSignal) KT 76A ATC transponders that are installed on aircraft. This AD requires incorporating a modification on the affected transponders that consists of replacing two resistor network modules with glass-coated modules. This AD is the result of reports of these ATC transponders transmitting misleading encoding altimeter information to ground-based ATC radar sites and nearby Traffic Alert and Collision Avoidance System (TCAS)- equipped aircraft. The actions specified by this AD are intended to prevent the transmission of misleading encoding altimeter information between affected aircraft caused by the inability of these ATC transponders to coordinate with ground-based ATC radar sites and nearby TCAS-equipped aircraft.
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.
Aircraft
Appliances and equipment
