6S2.399.000 Series 3

The 6S2.399.000 Series 3 Control Unit is an aviation electronic module designed for use in the automatic control and electrical systems of Mi-8/Mi-17 helicopter family variants, including Mi-8AMT, Mi-8MTV-1 and related modifications. The unit receives, conditions, distributes and amplifies control signals required for stable system operation during flight and ground modes.

The unit interfaces with autopilot systems, engine RPM regulators and other avionics, forming part of the aircraft’s automated control loop. It is frequently referenced with autopilot units such as the AP-34B and digital engine control regulators (e.g., ERD-3VM). The 6S2.399.000 Series 3 is installed within the avionics bay in designated mounting points and is compatible with standard onboard wiring systems.

The device operates from a three-phase 36 V, 400 Hz AC supply and provides channel signal amplification and processing. It offers independent output channels and feedback amplification to support flight automation and safety-critical subsystems. The control unit is classified as aviation technical equipment (ATE) and is intended for integration into certified rotorcraft systems used in commercial, transport, and special mission roles.
Alternate Designations:
The 6S2.399.000 Series 3 control unit may also appear in aircraft documentation, maintenance records or spare-parts requests under alternative notations and decimal formats, including: 6С2.399.000, 6C2-399-000, 6C2399000, 6C2 399 000.
All of these designations refer to the same control unit type.

Purpose: Signal processing, amplification and routing within aircraft automatic control systems
Systems: Automatic flight control system, avionics, electrical control circuits
Application: Mi-8, Mi-17, Mi-8AMT, Mi-8MTV-1 and related helicopter variants
Product Type: Aircraft electronic control unit
Power Supply: 36 ± 2 V AC, three-phase, 400 Hz
Current Consumption per Phase (A): Phase A — not more than 0.6 A; Phase B — not more than 0.6 A; Phase C — not more than 0.6 A
Residual Output Signal on All Channels: Not more than 3 V
Feedback Loop Gain (Uout/Uin): 1.6 ± 0.6
Weight: Not more than 8 kg
Precious Metals (summary): Silver, Platinum, Gold (in certified internal components per manufacturer table)
Mounting: Installed in avionics bay on dedicated mounting points
Condition: As applicable
Documentation: Manufacturer passport and maintenance forms available upon request

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.