6S2.553.002 series 1

6S2.553.002 Series 1 compensation sensor (KD) is an aircraft component used in the automatic flight control systems of Mi-8 family helicopters, including Mi-8T, Mi-8MT, Mi-17, Mi-171 and Mi-172. The sensor forms part of the control loop in systems such as the AP-34B autopilot, providing positional feedback that supports system stability, actuator response and automatic control accuracy.

The sensor generates electrical output signals based on the angular position of the sensor arm relative to the stator and operates from the aircraft’s 36 V, 400 Hz AC supply. Output voltages vary depending on the angle of the lever position, forming a proportional signal for downstream autopilot electronics.

The 6S2.553.002 sensor is mounted as part of the autopilot unit assembly and interfaces directly with control amplifiers and signal distributors. The device belongs to certified aviation equipment and is designed to maintain system reliability in flight and ground operations.

Alternate Designations:
The 6S2.553.002 sensor may also appear under variations such as 6C2.553.002, 6С2553002, 6S2-553-002 and 6S2 553 002.
All entries refer to the same component.

Purpose: Generate positional electrical output for automatic flight control systems
Systems: Automatic flight control, AP-34B autopilot assembly
Application: Mi-8, Mi-8T, Mi-8MT, Mi-17, Mi-171, Mi-172
Product Type: Compensation sensor (KD)
Power Supply: 36 ±2 V AC, 400 Hz
Output Voltage between terminals (± positions):
— 4-5 pins (V): +30° → 38 +4 / −8; 0° → 33 +4 / −8; −30° → 33 +4 / −8
— 4-6 pins (V): +30° → 38 +4 / −8; 0° → 33 +4 / −8; −30° → 33 +4 / −8
— 5-6 pins (V): +30° → 66 +7 / −16; 0° → 55 +7 / −16; −30° → 46 +7 / −16
Angular reference: Positive rotation = clockwise
Weight: Not more than 0.7 kg
Precious Metals: Gold, silver (passport table page 2)
Condition: As applicable
Documentation: Manufacturer passport available

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