BU-32-3 Series 2 (6C2.399.032-03)
Control unit
Description
BU-32-3 Series 2 (6C2.399.032-03) aircraft control unit
BU-32-3 Series 2 (6C2.399.032-03) is an electronic unit used in the SPUU-52 movable-stop control system. It processes signals associated with ambient pressure and temperature and forms commands for the actuator that positions the movable pedal stop. The system limits available tail-rotor pitch under defined conditions to protect the helicopter transmission from excessive loads. The unit is therefore a system-specific controller, not a general-purpose relay or an independent sensor.
Full descriptionCollapse description
Signal processing and control function
The control unit receives the system inputs, applies the calibrated transfer characteristics and controls the actuator that moves the stop. Documented supply values include 36 V AC at 400 Hz and 27 ±2.7 V DC. The listed current limits distinguish AC consumption, continuous DC consumption and a higher short-duration DC value. Pressure and temperature transfer ratios are part of the calibrated system response and must not be adjusted without the approved procedure.
Role in the SPUU-52 system
The unit works with sensors, wiring, the actuator and mechanical stop of the SPUU-52 installation. Related controllers are listed in the electronic control units category, but similar BU-32 suffixes may correspond to different calibration or configuration. Diagnosis should cover the complete system, including the movement of the stop and the validity of pressure and temperature inputs, before the controller is declared unserviceable.
Helicopter application
SPUU-52 is associated with the Mil Mi-8 family and related helicopter control-system configurations. Exact use of BU-32-3 Series 2 (6C2.399.032-03) depends on the aircraft modification and the installed SPUU-52 execution. A shared family name or connector arrangement does not establish interchangeability between BU-32-3, BU-32-4 and other BU-32 variants.
Identification and ordering
Confirm the complete BU-32-3 Series 2 (6C2.399.032-03) marking and document reference 6C2.399.032-03 PS before ordering. The numerical suffix is part of the product identity. An enquiry should include the helicopter modification, installed SPUU-52 configuration, required condition, connector and mounting details, and a clear data-plate image. Calibration and acceptance should follow the passport and approved aircraft maintenance instructions.
Technical details
- Product Type
- Aircraft electronic control unit
- Function
- Processing of pressure and temperature inputs and control of a movable pedal stop
- Application / Where Used
- SPUU-52 movable-stop control system
- System / Installation Area
- Helicopter flight-control limitation circuit
- Typical Platform
- Mi-8 family; exact helicopter modification and system execution to be confirmed
All specificationsCollapse specifications
- AC Supply
- 36 V, 400 Hz
- DC Supply
- 27 ±2.7 V
- AC Current Consumption
- Not more than 0.3 A
- DC Current, Continuous
- Not more than 0.5 A
- DC Current, Short-Term
- Not more than 2.5 A
- Temperature Transfer Ratio
- 1.05 ±0.32% of actuator travel per °C
- Pressure Transfer Ratio
- 0.39 ±0.12% of actuator travel per mmHg
- Weight
- Not more than 1.3 kg
- Alternative Designations
- BU-32-3 Series 2 (6C2.399.032-03); BU-32-3; 6C2.399.032-03; БУ-32-3 серия 2 (6С2.399.032-03)
- Technical Documentation
- Passport 6C2.399.032-03 PS
Payment & delivery
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Payment & delivery terms