6S2.390.007-3 Series 1

6S2.390.007-3 control panel in the AP-34B system

The 6S2.390.007-3 Series 1 is an aircraft autopilot control panel used in the AP-34B Series 2 automatic flight control system. It is installed in the cockpit of Mi-8 and Mi-17 family helicopters and gives the crew direct access to autopilot mode selection and command input. Through this panel, the pilot can engage or disengage autopilot functions and select the required operating mode. The unit does not stabilize the helicopter by itself; it works as the cockpit command interface for the AP-34B system.

Pilot command input through the 6S2.390.007-3 panel

In operation, the 6S2.390.007-3 allows the crew to send control commands into the autopilot logic. The panel is used during selection of stabilized flight modes and during transitions between manual control and automatic stabilization. Commands from the panel are routed to the related AP-34B units, where they are processed and converted into control signals for the autopilot channels. This makes the panel one of the main crew-facing parts of the system, even though most of the actual signal processing is handled by other blocks.

6S2.390.007-3 with AP-34B logic and amplifiers

The control panel works together with the AP-34B control unit, amplifier circuits, sensors and actuator control paths. Its signals are part of the chain that supports attitude stabilization, heading control and other autopilot functions available on the installed helicopter configuration. Depending on the aircraft version, the panel may also interact with circuits related to engine or governor signal logic. During troubleshooting, it is important not to treat the panel as an isolated switch box. Poor contact, unstable mode selection or missing indication can affect the whole autopilot control path.

Cockpit installation of the 6S2.390.007-3 unit

The 6S2.390.007-3 is mounted in the helicopter cockpit on standard brackets. Since the panel is operated directly by the crew, its mechanical condition matters as much as its electrical condition. Switches, buttons, indicators, connectors and the front panel must remain clear and reliable in service. A worn selector, intermittent contact or weak indication may create practical problems for the crew even when the rest of the autopilot system is serviceable. For this reason, cockpit panels are normally checked for both electrical function and usability.

Power supply and signal circuits of 6S2.390.007-3

The panel is powered from aircraft DC and AC electrical buses. It uses DC power for control circuits and three-phase AC power for associated signal or system functions, depending on the AP-34B wiring arrangement. The unit participates in command switching, mode activation, feedback handling and communication with downstream autopilot electronics. Correct power supply is essential: incorrect voltage, phase problems, poor grounding or connector issues can lead to unstable operation or false fault symptoms in the autopilot system.

Identification and alternate markings of 6S2.390.007-3

The same control panel may appear in documents under several spelling formats. Latin and Cyrillic characters are often mixed in parts lists, and the separators may change depending on the catalog. Common forms include 6S2.390.007-3, 6С2.390.007-3, 6S2-390-007-3, 6S2390007-3 and 6S2 390 007-3. For procurement, repair or stock identification, these variations should be checked carefully. The safest approach is to confirm the part number against the AP-34B documentation and the physical nameplate of the unit.

Supply and documentation for 6S2.390.007-3

The 6S2.390.007-3 is supplied as aviation technical equipment. It may be available as new stock, storage stock, repaired or overhauled equipment depending on availability. Before installation, the unit should be checked for condition, connector integrity, mounting points, switching behavior, markings and documentation. For aircraft use, the manufacturer passport and AP-34B system manual are normally requested. If the unit is purchased separately, compatibility with the installed AP-34B Series 2 set should be verified before shipment.

Product Type: Aircraft autopilot control panel
Designation: 6S2.390.007-3 Series 1
Alternative Designations: 6С2.390.007-3; 6S2-390-007-3; 6S2390007-3; 6S2 390 007-3
Function: Manual control, command input and mode selection for AP-34B autopilot system
Application / Where Used: Helicopter automatic flight control systems and cockpit control interface
System / Installation Area: AP-34B Series 2 automatic flight control system; cockpit installation
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-8AMT, Mi-8MTV-1 and related variants equipped with AP-34B Series 2
System Interaction: Interfaces with autopilot logic units, amplifiers, sensors and actuator control circuits
Supported Functions: Command switching, mode activation, feedback control and output communication to downstream autopilot electronics
DC Power Supply: 27 ±2 V
AC Power Supply: 36 ±2 V, 400 Hz, three-phase
Control Circuit Current Consumption: Not more than 1.5 A
AC Phase I Current Consumption: Not more than 0.7 A
AC Phase II Current Consumption: Not more than 0.7 A
AC Phase III Current Consumption: Not more than 0.7 A
Residual Output Voltage from Power-Off SPD Channel: Not more than 5 V
Mounting: Cockpit installation on standard brackets
Weight: Not more than 2.9 kg
Precious Metals Content: Silver, palladium and platinum according to manufacturer passport
Category: Aviation technical equipment / flight-control avionics
Condition: As applicable
Technical Documentation: Manufacturer passport and AP-34B system manual available upon request

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