BSPI-4-2 Series 2

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

The BSPI-4-2 Series 2 is an aircraft flight data acquisition and processing unit used as part of the BUR-1-2 Series 2 onboard flight data recorder system. Its job is to receive signals from aircraft systems and sensors, convert them into a usable format, and prepare structured flight parameter data for recording. In this system, the BSPI-4-2 Series 2 works as one of the main units between the aircraft sensors and the protected or operational storage equipment.

Flight parameter collection by BSPI-4-2 Series 2

The unit collects data from analog channels and discrete command lines. These inputs may come from onboard sensors, aircraft systems, control circuits, switches and other sources connected to the recording system. The BSPI-4-2 Series 2 processes the incoming information and forms a structured set of flight parameters. This allows the BUR-1-2 Series 2 system to record aircraft operating data for maintenance analysis, flight review or investigation of abnormal events.

Analog signal processing in BSPI-4-2 Series 2

The BSPI-4-2 Series 2 provides reception and conversion of multiple analog signal types. The unit works with DC signals, 400 Hz AC signals, low-frequency AC signals and square-wave signals within the specified limits. Different signal groups have different conversion accuracy requirements. In practical service, accuracy depends not only on the BSPI unit itself, but also on the sensor condition, wiring, connector quality, grounding and the correct aircraft-specific configuration.

Discrete command recording by BSPI-4-2 Series 2

Along with analog parameters, the BSPI-4-2 Series 2 records discrete commands. These commands are used to capture events, switch positions, system states and control signals. The unit distinguishes between the presence and absence of a discrete signal by voltage level. This is important for flight data analysis because many events are not gradual measurements, but simple state changes: a system is switched on, a command is issued, a warning appears, or a unit changes operating mode.

BSPI-4-2 Series 2 input channel structure

The unit supports up to 25 analog input channels and up to 48 discrete command inputs. The analog channels may include channels for two-wire, three-wire and potentiometric sensors, as well as frequency signal channels depending on the aircraft configuration. The exact channel assignment is not universal. It is defined by the aircraft wiring diagram, the BUR-1-2 Series 2 documentation and the coding configuration installed on the unit.

Installation of BSPI-4-2 Series 2 on aircraft

The BSPI-4-2 Series 2 is installed in the aircraft equipment area, often on a shock-mounted frame such as RA-37K depending on the aircraft layout. The frame helps reduce vibration loads during operation. Coding devices such as UKO-1 may be installed on the front panel to adapt the unit to a specific aircraft type and board number. Because of this, replacement should not be made by designation alone. The coding, mounting frame, connector arrangement and recorder system series must also match.

BSPI-4-2 Series 2 with storage and recorder equipment

The unit works in the recording system together with other BUR-1-2 Series 2 components. It may also interact with an operational storage unit such as TBN-K-4 where the aircraft system provides this function. The BSPI collects and converts data, while the storage equipment records the prepared information. If recorded data is missing or incorrect, the cause may be the BSPI-4-2 Series 2, but it may also be a sensor, cable line, coding device, storage unit, control panel or power supply problem.

Supply and inspection of BSPI-4-2 Series 2

For procurement or replacement, the full designation BSPI-4-2 Series 2 should be specified. The aircraft type, recorder system version, required condition and documentation should be confirmed before shipment. Before installation, the unit should be checked for housing condition, marking, connector integrity, coding devices, mounting compatibility, power consumption and readiness time. For aircraft use, the passport and official technical documentation should be supplied where available.

Product Type: Flight data acquisition and processing unit
Designation: BSPI-4-2 Series 2
Alternative Designation: БСПИ-4-2 серия 2
Function: Collection, conversion and processing of flight parameter signals
Application / Where Used: Onboard flight data recording systems
System / Installation Area: BUR-1-2 Series 2 flight data recorder system
Part of System / Included in Set: BUR-1-2 Series 2
Compatible Aircraft / Equipment: Aircraft and helicopters equipped with BUR-1-2 Series 2, including Mi-26 and Mi-8 depending on configuration
Number of Analog Input Channels: 25
Number of Discrete Command Inputs: 48
Total Measurements per Second: 64
Analog Channel Types: Two-wire, three-wire, potentiometric and frequency-signal channels depending on configuration
Analog Signal Conversion Accuracy, DC: ±1.0%
Analog Signal Conversion Accuracy, AC 400 Hz: ±1.0%
Analog Signal Conversion Accuracy, Low-Frequency AC ≤22.9 V: ±0.4%
Analog Signal Conversion Accuracy, Square-Wave 2.6 to 4.5 V: ±0.4%
Discrete Command Signal Level, Present: 2.6 to 33 V DC
Discrete Command Signal Level, Absent: 0 to 0.45 V DC
Operating Voltage: 18 to 33 V DC
Nominal Aircraft Supply: 27 V DC
Power Consumption: Not more than 15 W
Time to Readiness: Not more than 2 min
Continuous Operating Time: 15 h
Mounting: Shock-mounted frame, including RA-37K depending on installation
Aircraft-Specific Coding: UKO-1 coding devices depending on aircraft configuration
Associated Equipment: BUR-1-2 Series 2 system components; TBN-K-4 operational storage unit depending on configuration
Weight: 3.1 ±0.2 kg
Scope of Supply: BSPI-4-2 Series 2 unit, passport
Technical Documentation: Passport BSPI-4-2 Series 2, 6L3.038.010-01 PS

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