2.390.512-01 PUR

2.390.512-01 PUR mode control panel

2.390.512-01 is an aircraft mode control panel used with the SD-75 airborne radio rangefinder system. The designation is a drawing / decimal number of the component, while the functional name is PUR, meaning mode control panel. The unit provides remote control of operating modes, channel selection and system checking functions for the SD-75 distance measuring equipment. It is installed in aircraft cockpit avionics control areas and works as part of the short-range radio navigation equipment.

Control function of 2.390.512-01

The 2.390.512-01 panel allows the crew to control the SD-75 radio rangefinder from the cockpit. Through the panel, the operator can select operating channels, set the required DME frequency channel and switch the system between main operating and control modes. The panel does not measure distance independently; it sends control commands to the SD-75 receiver-transmitter and related equipment. The measured distance is then displayed on associated indicators, such as ISD-1, depending on the aircraft installation and system configuration.

2.390.512-01 in SD-75 distance measuring equipment

The SD-75 system is used for short-range navigation and continuous measurement of slant range from the aircraft to a ground radio beacon. Distance may be indicated in kilometers or nautical miles, depending on cockpit indicator configuration. The 2.390.512-01 PUR panel supports this system by selecting the required channel and operating mode. Correct DME operation depends on the receiver-transmitter, antenna system, cockpit indicators, power supply, wiring and the selected ground beacon. The panel should therefore be checked as part of the complete SD-75 installation.

Operating controls on the PUR front panel

The PUR front panel includes channel selectors for setting the radio beacon channel and a mode selector for system operation. Available modes include OFF, X / Y channel interval selection and CONTROL mode for built-in automatic test checking of the radio rangefinder. The panel may also include a built-in volume control for monitoring beacon identification audio in the pilot’s headset. These controls allow the crew to select navigation channels, verify system readiness and confirm beacon identification during flight operation.

Aircraft application of 2.390.512-01

The 2.390.512-01 PUR panel is used on aircraft equipped with the SD-75 radio rangefinder system. Typical application includes Tu-154M, Yak-40, Yak-42, An-26, An-72, An-124 Ruslan, Il-62M, Il-76T and Il-86 aircraft, depending on avionics configuration and documentation. The SD-75 system may also be integrated with other onboard navigation equipment, including the Kurs MP-70 navigation complex where applicable. Since avionics installations can differ by aircraft modification and modernization status, applicability should be confirmed before supply.

Identification and ordering of 2.390.512-01

Before ordering 2.390.512-01, the aircraft type, SD-75 system configuration, exact panel modification and required documentation set should be confirmed. The panel may also be requested by its functional name PUR. For correct supply, it is useful to specify whether a -01 or another modification is required, the condition, connector configuration, test status and compatibility with the aircraft wiring. The unit may be needed for operational replacement, avionics repair, cockpit restoration or spare parts stock for aircraft using SD-75 equipment.

Product Type: Mode control panel / radio rangefinder control panel
Designation: 2.390.512-01
Alternative Designations: PUR, ПУР, mode control panel 2.390.512-01
Function: Remote mode control, channel selection and test control for SD-75 airborne radio rangefinder
Application / Where Used: SD-75 airborne radio rangefinder / short-range navigation system
System / Installation Area: Aircraft cockpit avionics control panel / DME control system
Compatible Aircraft / Equipment: Tu-154M, Yak-40, Yak-42, An-26, An-72, An-124, Il-62M, Il-76T, Il-86 and other aircraft equipped with SD-75 according to documentation
Associated System: SD-75 airborne radio rangefinder
Associated Indicators: ISD-1 and related distance indication equipment where applicable
Related Navigation Equipment: Kurs MP-70 navigation complex where applicable
Power Supply: +27 V DC and 115 V / 400 Hz AC aircraft onboard networks
System Power Consumption: Not more than 100 VA from AC network
Control Logic: Frequency / channel control switching, readiness and failure signal output to associated systems
Number of Working Channels: 252 channels
Mode Selector Positions: OFF; X / Y operating modes; CONTROL
Control Mode: Built-in automatic test control of the SD-75 rangefinder
Audio Function: Beacon identification volume control for pilot headset monitoring
Transmitter Frequency Range, SD-75: 1025–1150 MHz
Receiver Frequency Range, SD-75: 962–1213 MHz
Transmitter Pulse Power, SD-75: 400–600 W, peak up to 2000 W depending on operating conditions
Distance Measurement Range, SD-75: Up to 740 km / up to 399.9 nautical miles
Retuning and Beacon Search Time, SD-75: Not more than 1.5–4 s
Distance Measurement Error, SD-75: ±200 m within 370 km; ±0.17 nautical miles within 200 nautical miles
Supported Aircraft Speed, SD-75: Up to 3200 km/h
Standards Reference: ICAO, ARINC-568, GOST 18977-79
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, SD-75 system documentation, aircraft maintenance documentation, wiring diagram and test records if available

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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.