6S2.390.126 Series 4 / PU-126

6S2.390.126 Series 4 PU-126 control panel

6S2.390.126 Series 4 is the decimal number of the PU-126 aircraft control panel. The unit is used as a cockpit control and switching panel in helicopter flight control and autopilot-related systems. It is associated with Russian-made civil and military helicopters, including Mi and Ka helicopter types, where the relevant flight control, stabilization or autopilot equipment is installed according to aircraft documentation.

PU-126 function in helicopter control systems

The PU-126 control panel is intended for selection of operating modes, switching of control functions and generation of command signals for helicopter stabilization and semi-automatic control systems. The panel supports crew interaction with the connected autopilot / flight control equipment and allows control of flight stabilization functions in several channels. It is not a standalone autopilot computer; it operates as a cockpit interface unit within a larger flight control system.

Application with PKV-252 and VUAP-1 systems

The 6S2.390.126 Series 4 panel may be used as part of PKV-252 / PKV-252-1 flight control complexes and VUAP-1 unified helicopter autopilot systems, depending on aircraft configuration. It may operate together with related equipment such as 6S2.390.125 series panels, BK-252 switching units, VDU-252 director control computers and feedback sensors. Exact compatibility should be confirmed by the aircraft equipment list, autopilot documentation and product passport.

Control channels of PU-126

The PU-126 panel supports control and switching functions related to the main helicopter stabilization channels. These include roll channel control, pitch channel control and altitude channel control. Through these channels, the connected system can support angular stabilization, longitudinal balancing and barometric altitude hold functions. The exact functions available from the panel depend on the installed autopilot system, wiring and aircraft modification.

Cockpit installation of 6S2.390.126 Series 4

The panel is designed as an aircraft cockpit instrument panel unit. It may be installed on the central console, side console or other cockpit control area according to helicopter layout. The front panel includes operating controls and indication elements for crew use. Depending on modification, the panel may include red-white or green-compatible illumination for operation in day, night or NVG-related cockpit lighting environments.

Identification and ordering of 6S2.390.126 Series 4

The product may be referenced as 6S2.390.126 Series 4, 6С2.390.126 сер. 4, PU-126 or ПУ-126. For correct supply, it is useful to specify the aircraft type, installed flight control complex, required series, illumination version, connector configuration, condition, documentation requirements and whether the unit must be supplied with a passport, tag or test record.

Product Type: Aircraft control panel / remote control panel
Designation: 6S2.390.126 Series 4
Alternative Designations: 6С2.390.126 сер. 4, PU-126, ПУ-126, control panel PU-126
Function: Mode selection, switching and generation of control signals for helicopter stabilization and semi-automatic control systems
Purpose: Cockpit control interface for flight control / autopilot equipment
Application / Where Used: Helicopter flight control, stabilization and autopilot systems
Associated Systems: PKV-252, PKV-252-1, VUAP-1 where applicable by documentation
Related Equipment: 6S2.390.125 series control panel; BK-252 switching units; VDU-252 director control computers; feedback sensors
Compatible Aircraft: Mi-8 / Mi-17, Ka-226, Ka-32 and related Mi / Ka helicopters where applicable by documentation
System / Installation Area: Helicopter cockpit flight control / autopilot control area
Installation Location: Central console, side console or cockpit control panel according to aircraft documentation
Controlled Channels: Roll, pitch and altitude channels
Roll Channel Function: Stabilization and control of angular position
Pitch Channel Function: Longitudinal balancing / pitch control
Altitude Channel Function: Barometric altitude stabilization where applicable
DC Power Supply: 27 V DC ±10%
AC Power Supply: 36 V / 115 V AC, 400 Hz for illumination and related circuits where applicable by aircraft modification
Current Consumption: Not more than 1.5 A through DC circuit, according to supplied data
Operating Mode: Continuous
Design: Modular cockpit panel unit
Panel Illumination: Built-in red-white or green-compatible illumination depending on modification
Controls: Rotary knobs / trimmers for roll and pitch signal input; push-button switches for automatic hold modes
Indication: Channel status, autopilot readiness and trim-related indication where applicable
Approximate Weight: About 1.8–2.2 kg depending on series and mounting frame
Condition: As applicable
Technical Documentation: Product passport, aircraft installation documentation, test documentation upon request

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