BSPI-4-2

Flight parameter acquisition by BSPI-4-2

The main function of the BSPI-4-2 is to collect parametric flight information from multiple onboard sources. The unit can process analog, frequency and potentiometric signals, as well as discrete commands. These signals may come from aircraft systems, sensors, switches and control-position circuits. After receiving the input data, the block converts and formats the information into a structured signal set suitable for recording. This allows the flight recorder system to store important aircraft operating parameters for later analysis, maintenance review or incident investigation.

BSPI-4-2 in the BUR-1-2 system

The BSPI-4-2 is used as part of the BUR-1-2 onboard flight data recorder system. A typical system set includes the BSPI-4-2 information acquisition unit, PU-25 control panel and ZBN-1-1 protected onboard storage unit. In this architecture, the BSPI collects and prepares the data, while the protected storage unit records it. This separation is important: the acquisition unit handles signal conversion and formatting, but the crash-protected recorder is responsible for preserving the information under emergency conditions.

Signal conversion and recording logic of BSPI-4-2

The unit converts different types of incoming aircraft signals into a format that can be written into the onboard recorder. DC, AC, angular / synchro and frequency channels have their own conversion accuracy requirements. Discrete command recording is also supported, which allows the system to capture events such as switch positions, command signals or system-status changes. The quality of the recorded data depends not only on the BSPI-4-2 itself, but also on sensor calibration, wiring condition, connector integrity and the correct aircraft-specific configuration.

Aircraft adaptation of the BSPI-4-2 unit

The BSPI-4-2 may be adapted to a specific aircraft type and board configuration through coding devices installed on the front panel, such as UKO-1-15 or UKO-1-12 depending on the system version. These coding devices help match the data acquisition algorithm to the aircraft type, onboard equipment set and aircraft number. This is important for replacement: two visually similar BSPI-4-2 units may not be immediately interchangeable if the coding configuration, system series or aircraft wiring differs.

Installation features of BSPI-4-2

The BSPI-4-2 is normally installed on a special mounting frame with shock absorbers to reduce vibration loads during flight. Connection to the aircraft wiring network is made through a plug-in connector, including RPKM-type connector arrangements with indexing elements where used. The indexing helps prevent incorrect installation of the unit on the frame. During maintenance, attention should be paid to the condition of the connector, mounting frame, shock absorbers, coding devices and fastening points, because mechanical or connector issues can affect data acquisition reliability.

Aircraft application of BSPI-4-2

The BSPI-4-2 is applied on aircraft and helicopters equipped with BUR-1-2 flight data recording systems. It is associated with helicopters such as Mi-26 and may also be used on Mi-8, Mi-17 and other aircraft depending on the installed recorder system. Exact applicability should be confirmed by the aircraft equipment list, flight recorder system documentation and modification status. Since the unit is part of a certified recording system, substitution should be made only with the correct designation, series compatibility and required configuration.

Supply and inspection of BSPI-4-2

For procurement or replacement, the full designation BSPI-4-2 / BSPI-4-2 should be specified. The required system version, aircraft type, condition and documentation should also be confirmed before shipment. Before installation, the unit should be checked for housing condition, connector integrity, marking, coding devices, mounting compatibility and electrical performance. For aircraft use, product passport, acceptance documentation, bench-test records or official technical documentation should be supplied where available.