SPUU-52

SPUU-52 movable control stops system overview

The SPUU-52 is an aircraft movable control stops system used in automatic control and regulation circuits. It is not a single sensor or one actuator. It is a complete set of equipment that receives pressure and temperature data, processes the signals, and moves the adjustable stop through an electromechanical mechanism. In helicopter control systems, this type of system is used to limit control travel according to operating conditions. Technical descriptions of the Mi-8 control system describe SPUU-52 as a system that automatically limits tail rotor pitch by limiting forward movement of the right pedal.

Automatic limitation through SPUU-52

In operation, SPUU-52 changes the position of the movable stop according to pressure and temperature inputs. The system uses signals from the pressure measurement set and temperature receiver, processes them in the control unit, and sends a command to the actuator. The stop then changes position and limits further mechanical travel. This is done automatically, without the crew setting the stop manually for every change of altitude or outside air temperature. The exact movement depends on system adjustment and on the signal chain from sensors to actuator and feedback sensor.

Control system work around the SPUU-52 set

The SPUU-52 set works as a chain. The BU-32 control unit processes the incoming signals. The IKD27DA-400-830 pressure measurement set supplies pressure data. The P-1 or P-1Tr temperature receiver supplies temperature data. The DOS 6C2.553.009 feedback sensor confirms the actual movement of the stop. The actuator mechanism, often listed as MP-100M in technical descriptions, physically moves the stop. If the system does not limit travel correctly, the problem may be in any of these units, in the wiring, in the actuator movement, or in the feedback path.

Aircraft application of SPUU-52

The SPUU-52 is used in aircraft control systems where coordinated limitation by pressure and temperature is required. Public technical materials most clearly describe it in relation to Mi-8 / Mi-17 helicopter control systems, especially the tail rotor control channel and movable stop mechanism. Variants of the system may differ by aircraft version and equipment standard. Some descriptions mention versions such as SPUU-52-1, SPUU-52E, SPUU-52-2, and SPUU-52-3, with different BU-32 blocks and settings. For supply or replacement, the exact aircraft documentation should be checked.

Identification and ordering checks for SPUU-52

Before ordering, the system composition should be checked against the aircraft parts catalog, summary passport, and installed equipment list. A request for “SPUU-52” may refer to the complete set or to one of its components: BU-32, DOS feedback sensor, IKD27DA pressure measurement set, P-1 temperature receiver, mounting hardware, passports, or labels. For a clear request, it is better to specify whether the complete system is required or only a module from the set. The product is also known under alternative designation СПУУ-52.

Product Type: Aircraft movable control stops system
Function: Conversion of electrical signals into controlled mechanical limitation
Application / Where Used: Aircraft automatic control and regulation systems
System / Installation Area: Control and regulation circuits
Working Medium: Electrical signal / mechanical actuation
Operating Voltage (AC): 36 V, 400 Hz
Operating Voltage (DC): 27 ± 2.7 V
Current Consumption (AC): Not more than 0.3 A
Current Consumption (DC, Continuous): 0.5 A
Current Consumption (DC, Short-Term): 2.5 A
Transmission Ratio by Temperature: 1.05 ± 0.42 % of travel per °C
Transmission Ratio by Pressure: 0.28 ± 0.11 % of travel per mm Hg
Weight: Not more than 2.7 kg
Scope of Supply: Control unit BU-32, feedback sensor 6C2.553.009, pressure measurement set IKD27DA-400-830, temperature receiver P-1 / P-1Tr, mounting hardware, passports and labels
Technical Documentation: Summary Passport 6C1.600.052 PS

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