6S2.390.074

6S2.390.074 control panel in the SAU-1T system

6S2.390.074 is an aircraft control panel used as part of the SAU-1T automatic flight control system. The unit provides remote cockpit control for selecting, checking and coordinating operating channels of the aircraft autopilot system. It is used on Soviet / Russian heavy transport and passenger aircraft, including Il-76 family aircraft and the Il-76MD modification, depending on the installed flight control and navigation equipment. The panel is also referred to as PU 6S2.390.074 and belongs to aviation technical equipment.

Control function of PU 6S2.390.074

The PU 6S2.390.074 panel allows the crew to control the main operating modes of the SAU-1T automatic flight control system. Through the panel, pilots can engage or disengage autopilot half-sets, select stabilization functions and coordinate selected flight modes. The unit issues analog and discrete control commands to associated SAU blocks, including communication and computing units. It does not operate as a standalone autopilot; it works as the cockpit command and mode-selection interface within the complete automatic control system installed on the aircraft.

6S2.390.074 in Il-76 cockpit installation

The 6S2.390.074 control panel is installed in the crew cockpit, typically on the central pilots’ console between the captain and copilot positions. This location allows both pilots to observe the light indication and operate the switches during flight. The front panel includes rotary and push-button controls, illuminated pushbutton lamps and annunciator fields used to monitor the operation of SAU-1T system half-sets and selected flight control modes. The panel connects to the aircraft wiring through standard plug connectors installed on the rear or lower part of the housing.

Operating modes controlled through 6S2.390.074

The 6S2.390.074 panel is used for switching and coordinating automatic flight modes. These include engagement and disengagement of main and backup autopilot half-sets, stabilization of aircraft attitude in roll, pitch and heading, barometric altitude stabilization and indicated airspeed stabilization when used with the autothrottle system. The panel also supports preselected route and heading-related modes, including assigned track angle and assigned heading functions, as well as approach-related modes where provided by the aircraft configuration and navigation system.

System integration with SAU-1T equipment

The 6S2.390.074 panel works with key components of the SAU-1T-2B / SAU-1T-BT automatic flight control system used on Il-76 type aircraft. Functionally associated equipment may include the BS communication block, roll, pitch and heading channel computers, disconnect blocks such as BO-10, the Kupol flight-navigation complex, heading system units, central gyrovertical equipment, cockpit flight and navigation indicators, autothrottle equipment such as AT-6, altitude sensors and steering actuators. Exact integration depends on the aircraft wiring and maintenance documentation.

Identification and ordering of 6S2.390.074

The panel may be referenced as 6S2.390.074 or PU 6S2.390.074 and may exist in several series, including Series 2, Series 3 and Series 4. Before ordering, the aircraft type, required series, condition, connector configuration and documentation set should be confirmed. The unit may be required for operational replacement, overhaul support, restoration of the SAU-1T system or spare parts stock. For acceptance, the buyer should clarify passport availability, test records, repair status, certificate requirements and compatibility with the aircraft’s installed automatic flight control system.

Product Type: Aircraft control panel / autopilot control panel
Designation: 6S2.390.074
Alternative Designations: PU 6S2.390.074, ПУ 6С2.390.074, 6С2.390.074
Function: Remote control, mode selection, testing and coordination of SAU-1T automatic flight control channels
Application / Where Used: SAU-1T automatic flight control system
System / Installation Area: Cockpit central pilots’ console / automatic flight control system
Compatible Aircraft / Equipment: Il-76 family aircraft, including Il-76MD, and other aircraft with compatible SAU-1T system configuration
Associated System: SAU-1T / SAU-1T-2B / SAU-1T-BT automatic flight control system
Series: Series 2, Series 3, Series 4 and other executions according to documentation
Main Power Supply: 27 V DC aircraft onboard network
Permitted DC Voltage Range: 24–29.4 V
Lighting Power Supply: 5.5 V AC, 400 Hz
Operating Mode: Continuous operation during aircraft flight
Signal Interface: Analog-discrete interface with relay contact commands and DC analog signals
Control Functions: Autopilot half-set engagement, roll stabilization, pitch stabilization, heading stabilization, altitude stabilization, indicated airspeed stabilization, ZPU / ZK and approach-related modes depending on aircraft configuration
Panel Features: Rotary switches, pushbutton switches, illuminated pushbutton lamps and annunciator fields
Connection: Standard aircraft plug connectors on rear or lower housing area
Panel Finish: Matte anti-glare light-composition coating
Associated Equipment: BS communication block; roll, pitch and heading channel computers; BO-10 disconnect block; Kupol flight-navigation complex; heading system; central gyrovertical; cockpit flight and navigation indicators; AT-6 autothrottle; barometric altitude sensors; steering actuators
Classification Code: OKPD2 30.30.50.110
Category: Aviation technical equipment / ATE
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Documentation: Product passport, test report, certificate, aircraft maintenance documentation and wiring records if available

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