P8UK

P8UK selector switch in the SKES-2027B system

P8UK is an aircraft rotary wafer switch used in the SKES-2027B electric fuel quantity measuring system. The switch is installed on the cockpit electrical or fuel indication panel and allows the crew to select which fuel tank signal is displayed on the main fuel quantity indicator. Since the aircraft fuel system includes several tanks, the selector connects the required transmitter circuit to the cockpit indicator. The unit is a switching device, not a fuel level sensor.

Tank selection through the P8UK switch

The switch has fixed positions corresponding to the fuel tank layout of the aircraft. Typical positions may include total fuel quantity, service tank, left external tank, right external tank and additional tanks, depending on the helicopter configuration. When the handle is turned to a selected position, the measuring bridge circuit receives the signal from the related DTPR fuel transmitter. This allows the pilot or flight engineer to check the fuel quantity in a specific tank using a single cockpit indicator.

P8UK with BE-09K and DTPR transmitters

P8UK works with the BE-09K fuel quantity indicator and DTPR lever-float fuel transmitters installed in the tanks. It may also be used in systems where IDP-1 float sensor simulators are installed for removable additional tanks. The switch commutates low-current measuring circuits and, depending on the aircraft wiring, may also be linked with indication or test circuits. If the fuel reading is incorrect, the check should include selector contacts, wiring, indicator, transmitters, simulator circuits and grounding.

Panel installation of the P8UK switch

The switch is built as a multi-position aviation rotary mechanism with fixed detents. It is intended for panel mounting with screw attachment and rear plug connection. In cockpit installations, the marking around the selector positions usually follows the tank designations used in the aircraft fuel system. Some versions may include lighting or red-light adaptation for night cockpit operation. For replacement, the panel version, position marking, connector type and lighting execution should be checked before confirming interchangeability.

Identification and ordering of P8UK

Before ordering, the exact marking should be checked against the SKES-2027B passport, aircraft parts catalog or fuel system documentation. P8UK may appear together with related designations such as P8U, P-8U or P-8UK, but the installed version should be confirmed by aircraft documentation. For correct selection, provide the aircraft type, installed fuel quantity system, cockpit panel position, required number of positions and a photo of the existing switch. The product is also known under alternative designations P8UK, P-8UK and П8УК.

Product Type: Aircraft tank selector switch / rotary wafer switch
Function: Manual switching of fuel quantity measuring channels
Application / Where Used: Aircraft electric fuel quantity indication systems
System / Installation Area: Cockpit fuel quantity panel / SKES-2027B measuring circuit
Part of System / Included in Set: SKES-2027B electric fuel quantity measuring system; related SKES-2027 variants may apply
Compatible Aircraft / Equipment: Mi-8, Mi-8T, Mi-8MTV-1, Mi-8AMT, Mi-17, Mi-171 family helicopters, depending on configuration
Compatible Equipment: BE-09K indicator, DTPR fuel transmitters, IDP-1 float sensor simulator
Typical Selector Positions: Total, Tank R, Tank Pl, Tank PPr, Tank D, depending on system configuration
Nominal Supply Voltage: 27 V DC
Operating Voltage Range: 24.3–29.7 V DC
Switched Signal Type: Low-current measuring signals in fuel quantity bridge circuits
Associated DC Circuits: Signalling / lamp circuits, depending on aircraft wiring
Insulation Resistance: Not less than 20 MOhm under normal climatic conditions
Switching Mechanism: Rotary multi-position wafer mechanism with fixed positions
Number of Fixed Positions: Usually 5 or 6, depending on fuel system configuration
Mounting Type: Panel mounting with screw attachment
Connection Type: Rear plug connector, SH-type connector depending on version
Lighting Version: Red-light cockpit execution may be available
Operating Temperature Range: −60 to +60 °C
Environmental Resistance: Designed for aircraft vibration and short-term linear acceleration loads
Scheduled Maintenance: Cleaning of internal contact rings and panels with rectified alcohol; lubrication of friction points with OKB-122-7 grease where specified
Maintenance Interval: Every 500 flight hours, where specified by maintenance documentation
Alternative Designations: P8UK; P-8UK; P8U; P-8U; П8УК; П-8УК
Technical Documentation: Product passport, SKES-2027B documentation and aircraft fuel system documentation

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