Kt 70 Installation Manual Updated
Output LED flashes, but heater stays cold. Solution: Measure voltage at terminals 8&9. If 0V, output triac/relay is dead. Replace unit. If voltage present, external SSR or contactor is faulty.
Following the sequence ensures success. Do not power on until all steps are checked.
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Consult the manual's programming matrix to ground the exact pins corresponding to your aircraft's hexadecimal or octal code. Required Testing (FAA CFR 91.413)
The KT 70 uses a dual-connector configuration on its rear backplate: a primary D-subminiature connector for power, data, and ground, and a blind-mate coaxial connector for the RF antenna. Main D-Sub Connector Pinout (Partial Map) Pin Number Function Name Description Aircraft Power (+AIRCRAFT) Main DC input (14V or 28V) 2 Aircraft Power (+AIRCRAFT) Parallel power pin for current distribution 3 Power Ground (GND) Main chassis and system ground 4 Power Ground (GND) Parallel ground pin 5 Cavity Switched Output Supplies power to external switch legs 10 Gillham Code A1 Altitude Encoder Input Bit A1 11 Gillham Code A2 Altitude Encoder Input Bit A2 12 Gillham Code A4 Altitude Encoder Input Bit A4 13 Gillham Code B1 Altitude Encoder Input Bit B1 14 Gillham Code B2 Altitude Encoder Input Bit B2 15 Gillham Code B4 Altitude Encoder Input Bit B4 16 Gillham Code C1 Altitude Encoder Input Bit C1 17 Gillham Code C2 Altitude Encoder Input Bit C2 18 Gillham Code C4 Altitude Encoder Input Bit C4 19 Gillham Code D4 Altitude Encoder Input Bit D4 24 Audio Output Audio alert connection to intercom 35 External Suppress In/Out Mutual suppression pulse line Wiring Instructions Output LED flashes, but heater stays cold
The mounting rack must be securely grounded to the aircraft’s instrument panel or primary structure. Ensure a metal-to-metal bond by removing paint around the mounting holes. 3. Electrical Wiring and Pin Configuration
High-efficiency, low-loss coaxial cable (such as Electronic Cable Specialists or PIC wire) is mandatory. Post-Installation Alignment and Checkout Replace unit
2.2 Amps maximum at 14V; 1.1 Amps maximum at 28V.
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One of the biggest selling points of the KT 70 is its form factor. For those replacing aging KT 76A units, the manual highlights that the KT 70 is designed to fit the same panel cutout and use the same mounting holes.
Use aerospace-grade wire for all power and ground connections (minimum 20 AWG).