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The Value of Simplicity

AlliedSignal's leadership in avionics technology is once again evident in its new, easy-to-use KT 76C panel-mounted transponder. Drawing experience from the proven performance of over 150,000 KT 76 and 76A transponders, the KT 76C combines state-of-the-art technology with simplicity of use.

The KT 76C is the first panel mounted Mode A/C transponder to allow for sequential push-button squawk/code entry. To further ease pilot workload, the push of a single button switches to a user pre-set VFR code, such as 1200. Best of all, its bright microprocessor-driven gas plasma display is easily read in all light levels.

The KT 76C will fit directly into the existing location of a KT 76A, and it will easily fit in most stacks to replace other models. To ease installations, AlliedSignal's design engineers have ensured that it can operate with both 14 and 28 volt electrical systems. Although cooling air isn't required, an optional forced-air inlet has been included for those wishing to ensure maximum service life.

The Value of Safety

To function in today's complex airspace structure, a transponder is a necessity. Air Traffic Control (ATC) and now even other aircraft with thief on board Traffic alert and Collision Avoidance Systems (TCAS) rely on transponder Mode A and Mode C replies to determine other aircraft positions. Pilots need a transponder they can rely on. AlliedSignal's engineers have designed a panel-mount transponder that withstands the rigors of everyday use, so you know it will work when you need it.

Every detail of the KT 76C is designed for the challenging environment of your aircraft. Cutting edge surface mount technology to attach components to the Fiberglass/epoxy circuit boards allows this transponder to handle the stresses of flight. To test and prove this durability, the KT 76C has passed Highly Accelerated Lifecycle Testing (HALT), subjecting the unit to rapid, extreme levels of temperature, vibration and G-loading. Whatever flying environment you subject your transponder to, the KT 76C has already been there, and will keep on working.

The front of the unit has a new design that eases the pilot's workload through the use of ergonomic, high-reliability push-button switches. A high visibility gas plasma display provides a presentation of the selected code and pressure altitude. Automatic display dimming ensures readability under all conditions of cockpit illumination, from bright sunlight to total darkness.

The KT 76C is the most recent step in the evolution of the most successful general aviation transponder of all time. You will fly comfortably and safely with the knowledge that millions of flight hours of experience have gone into the design and testing of the KT 76C.



Your Bendix/King transponder is a radio transmitter and receiver which operates on radar frequencies. Receiving ground radar interrogations at 1030 MHz, it returns a coded response of pulses to ground-based radar on a frequency of 1090 MHz.

As with other Mode A/Mode C transponders, the KT 76C replies with any one of 4,096 codes, which differ in the position and number of pulses transmitted. By "replying" to ground transmissions, your KT 76C enables ATC computers to display aircraft identification, altitude and ground speed on Enroute, Approach or Departure Control radar screens. When the IDENT button is pressed, your aircraft will be positively identified to the Air Traffic Controller.

Operating the KT 76C

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Before starting your aircraft's engine, make sure that the KT 76C function selector knob, or your avionics master, is turned to OFF. After engine start, turn the function selector knob to SBY (standby). Give your transponder about 45 seconds to become operational. Select the proper reply code by pressing the desired code entry buttons. The reply code will be displayed in the code window. Before takeoff, rotate the function selector knob to the ALT (altitude) position for Mode C altitude reporting to ATC. Your pressure altitude (barometric altitude referenced to 29.92" Hg or 1013 Hp) will be displayed in the altitude window. If you do not have an encoding altimeter, rotate the function switch to ON for Mode A reporting.

CLR Button: Code entry mistakes are corrected, one digit at a time, by pressing the CLR button and reentering the correct code. The last active code will be displayed if a complete 4 digit code has not been entered and there is no activity on any of the code entry buttons, the VFR button, or the CLR button for 4 seconds.

VFR Button: Momentarily pressing the VFR button will enter a preprogrammed VFR code, typically 1200, in the code window. Pressing and holding the VFR button for 2 seconds will cause the last active code to be displayed.

Reply Indicator: The reply indicator blinks to indicate that the KT 76C is functioning properly and replying to interrogations.

Squawk Ident: When you are asked to "ident" by ATC, press the IDT button . The reply indicator will illuminate continuously for 18 seconds during the ident interval.

Important Codes:


7600 Communication Failure

7500 Hijacking

0000 Military- DO NOT USE! See the Airman's Information Manual (AIM) for detailed explanation of these codes and their use.

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