BPR-2-2s

BPR-2-2s limit regulator unit

BPR-2-2s is an aircraft limit regulator unit used in helicopter automatic control and monitoring systems. In the supplied context, the unit is identified as a block of limit regulators installed with frame 8G4.137008 and associated with Mi-26 / Mi-26T heavy transport helicopters. The block monitors operating parameters related to engine and rotor system protection and helps prevent the helicopter powerplant or transmission system from exceeding permitted operating limits.

Function of BPR-2-2s in Mi-26 systems

The main function of BPR-2-2s is automatic limitation of critical operating modes. The unit compares incoming parameter signals with preset limit values and issues commands or warning signals when a controlled parameter approaches or exceeds the allowable range. In the Mi-26 / Mi-26T context, the block is associated with protection of D-136 engines and the VR-26 main gearbox / rotor system. It is used as part of the onboard equipment that supports flight safety by reducing the risk of operation beyond approved limits.

Interaction with engine and rotor control equipment

BPR-2-2s works with equipment involved in engine regulation, rotor speed control and limit monitoring. According to the supplied context, it may exchange signals with electronic engine regulators such as ERD-VM / ERD-136, receive rotational speed data from sensors monitoring free turbine or rotor speed, and process gas temperature information from thermocouple circuits. When a limit condition is detected, the block can participate in command generation for fuel control correction, warning indication or recording of protection events, depending on helicopter configuration and documentation.

Controlled parameters and protective logic

The block is described as part of a limit-regulation circuit that monitors maximum rotor speed, free turbine speed and temperature-related limits. Its operation is based on a multi-channel protection logic intended to prevent false operation while still reacting to dangerous exceedances. The supplied context mentions a two-channel structure and tracking redundancy for the “-2s” version. Exact thresholds, timing delays and command logic must be checked only by the applicable Mi-26 / Mi-26T maintenance and operating documentation.

Installation with 8G4.137008 frame

BPR-2-2s is installed with the 8G4.137008 frame, which is referenced as the associated mounting frame for this unit. The block has a metal modular / cassette-type construction intended for aircraft vibration and operating loads. It is installed in the helicopter equipment area according to the aircraft layout and connected through the onboard wiring system. During maintenance, the unit should be checked together with connectors, mounting frame, sensor lines, engine regulator interfaces, warning circuits and parameter recording system inputs.

Identification and ordering of BPR-2-2s

Before ordering BPR-2-2s, the exact helicopter type, equipment configuration, frame requirement and documentation set should be confirmed. The item may be required for Mi-26 / Mi-26T powerplant control system repair, limit protection troubleshooting, replacement of a defective regulator block or spare parts stock. It is important to confirm whether the request is for the BPR-2-2s unit only or for the unit with frame 8G4.137008. Product passport, inspection documents, overhaul records and test documentation should be agreed before shipment.

Product Type: Limit regulator unit / aircraft electronic control unit
Designation: BPR-2-2s
Russian Designation: БПР-2-2с
Alternative Designations: BPR-2-2S, BPR-2-2C, БПР-2-2С, БПР-2-2с с рамой 8Г4.137008
Associated Frame: 8G4.137008
Russian Associated Frame: 8Г4.137008
Function: Monitoring and limitation of critical operating parameters in engine / rotor control system
Application / Where Used: Mi-26 / Mi-26T onboard automatic control and monitoring equipment
System / Installation Area: Powerplant control, rotor speed limitation and engine protection circuits
Compatible Aircraft / Equipment: Mi-26 and Mi-26T helicopters according to source context and documentation
Associated Engines: D-136 engines, according to source context
Associated Gearbox / Rotor System: VR-26 main gearbox / main rotor system, according to source context
Associated Engine Regulator: ERD-VM / ERD-136 electronic engine regulator, according to source context
Input Signals: Rotational speed sensor signals, gas temperature signals, engine / rotor operating parameter signals according to system configuration
Example Associated Sensors: DTA-10, DChV-type speed sensors; T-102 or similar thermocouple circuits, according to source context
Output Signals: Control, limitation, warning or event-recording signals depending on system configuration
Associated Recording System: Tester-UZ type flight data / parameter recording system, according to source context
Associated Warning Equipment: Central warning light / cockpit warning panel and Almaz-UP voice warning system, according to source context
Power Supply: 27 V DC aircraft power supply
DC Supply Range: 24 to 29.4 V according to source context
Current Consumption Reference: Not more than 1.5–2 A in command-output mode, according to source context
Protection Structure: Two-channel / duplicated limit-monitoring logic according to source context
Construction: Metal modular / cassette-type vibration-resistant housing
Installation: On 8G4.137008 shock-mounted frame
Operating Temperature Range: −60 °C to +60 °C
Operating Environment: Helicopter vibration and linear loads according to aviation equipment requirements
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, Mi-26 / Mi-26T maintenance documentation, wiring diagrams, test records and overhaul documents 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.