2.390.512-01 PUR

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.