PU-25-1

Service information input through PU-25-1

The PU-25-1 is used for manual input of service and identification data needed by the onboard recorder. This information may be required for correct data handling, aircraft identification, flight archive organization or later decoding, depending on system configuration. In practice, the panel allows the crew to interact with the recording system before or during operation. Correct input and proper panel operation are important because service data may be linked with the recorded flight information.

Display and control functions of PU-25-1

The PU-25-1 provides display and control functions for the flight data recorder system. It helps the crew check system readiness and interact with the recording equipment through the installed control interface. The panel is one of the visible elements of the recorder system, but the main data acquisition and storage functions are performed by other units. If the system does not respond correctly, the fault may be in the PU-25-1, BSPI unit, power supply, wiring, connector or the recorder system logic.

PU-25-1 as an updated PU-25 modification

The PU-25-1 is an updated modification of the earlier PU-25 panel, intended for use with BUR-1-2 Series 2 systems. The updated execution provides the required interface functions for this recorder architecture. For replacement, the suffix “-1” should be respected. A PU-25 and a PU-25-1 should not be treated as automatically interchangeable without checking the system documentation, connector arrangement, power supply, control logic and aircraft equipment list.

PU-25-1 in the BUR-1-2 Series 2 set

The PU-25-1 forms part of the BUR-1-2 Series 2 flight data recorder system. In this architecture, it works together with the data acquisition and processing unit, protected onboard storage unit and mounting equipment. The PU-25-1 provides the crew-facing control and display interface, while the data acquisition unit receives aircraft signals and the protected storage unit preserves the recorded information. When ordering spare parts, it should be specified whether the requirement is for the panel only or for the complete recorder system set.

Aircraft application of PU-25-1

The PU-25-1 is used on aircraft equipped with BUR-1-2 Series 2 onboard flight data recording systems. The exact installation location depends on cockpit layout, aircraft type and recorder system configuration. It may be installed in an area accessible to the crew or maintenance personnel, depending on the aircraft design. Before replacement, the aircraft type, system series, power supply, connector compatibility and documentation should be checked carefully.

Operating conditions of PU-25-1

The PU-25-1 is designed for aircraft operating environments, including a wide temperature range, high humidity, vibration, linear acceleration and shock loads. It operates from the aircraft DC power network and uses secondary ±15 V supply from the BSPI-4 unit according to the supplied data. The panel has a short readiness time after power-up and is designed for long continuous operation. During inspection, both electrical function and mechanical condition of the front panel should be checked.

Supply and inspection of PU-25-1

For procurement or replacement, the full designation PU-25-1 / PU-25-1 should be specified. Before installation, the unit should be checked for housing condition, front-panel controls, display elements, connector integrity, power consumption, readiness time and compatibility with the BUR-1-2 Series 2 system. For aviation use, product passport, manufacturer documentation or acceptance documents should be confirmed where available.