SKES-2027B

Aircraft fuel quantity system SKES-2027B

SKES-2027B is an aircraft electric kerosene quantity measuring system used on Mi-8 family helicopters. It measures fuel volume in the helicopter tanks and provides indication on the cockpit instrument panel. The system is used not only for normal fuel quantity reading, but also for signalling full tank condition during refuelling and low fuel reserve in the service tank. In operation, SKES-2027B works as a complete set: cockpit indicator, tank selector, float-type sensors and auxiliary checking equipment.

Fuel indication through SKES-2027B

The system receives signals from float-lever fuel level sensors installed in individual tanks. As the fuel level changes, the sensor changes the electrical signal sent to the cockpit indicator. The crew selects the required tank through the P8U selector and reads the fuel volume on the SKES-2027B pointer indicator. This layout allows both total fuel monitoring and individual tank control, depending on the selected mode and helicopter wiring. The system is intended for kerosene fuel quantity control, not for fuel flow measurement.

SKES-2027B sensors in Mi-8 fuel tanks

The SKES-2027B set includes separate sensors for specific helicopter tanks. The service tank uses the “Bak R” sensor, which also provides the emergency fuel reserve signal. The left external tank uses the “Bak Pl” sensor, while the right external tank uses the “Bak Ppr” sensor. If an additional tank is installed, the “Bak D” sensor is used. This tank-specific marking is important. Sensors from the same system are not always interchangeable by position, because each one is matched to its tank geometry and signalling function.

SKES-2027B signalling and control functions

Besides fuel quantity indication, SKES-2027B supports refuelling and low reserve warning functions. The system can signal “tank full” for selected tanks during refuelling and activate the emergency reserve warning from the service tank when the fuel level reaches the specified limit. The indicator, P8U selector, DTPr sensors and IDP1 float sensor simulator are part of the same electrical measuring chain. If the indication is incorrect, the cause may be the sensor, selector, wiring, indicator, grounding or calibration equipment, so the system should be checked as a complete circuit.

Identification and ordering of SKES-2027B

Before ordering SKES-2027B or its parts, it is better to confirm whether a complete set or a separate component is required. A full set may include the SKES-2027B indicator, P8U selector, tank sensors for service, left external, right external and additional tanks, plus the IDP1 simulator. For Mi-8T, Mi-8MTV-1 and Mi-171E helicopters, the installed configuration should be checked against the aircraft logbook and fuel system documentation. The product is also known under alternative designations SKES-2027B, СКЭС-2027Б and electric kerosene quantity indicator.

Product Type: Aircraft electric fuel quantity indicator set
Function: Measurement of fuel volume in tanks; full tank and emergency reserve signalling
Application / Where Used: Helicopter fuel quantity indication systems
System / Installation Area: Fuel system / cockpit fuel indication and tank sensor circuits
Compatible Aircraft / Equipment: Mi-8T, Mi-8MTV-1, Mi-171E and Mi-8 family helicopter fuel systems
Set Components: SKES-2027B indicator; P8U selector; SKES-2027B Bak R sensor; SKES-2027B Bak Pl sensor; SKES-2027B Bak Ppr sensor; SKES-2027B Bak D sensor; IDP1 Bak D SKES-2027A float sensor simulator
Indicator Scale: 2800 l
Power Supply: 24.0–29.4 V DC
Total Scale Error: ±3.0% at zero mark; ±5.0% at other scale marks
Individual Control Scale Error: ±2.5% at zero mark; ±5.0% at other scale marks
Signalling Device Error: Not more than ±3.0% of tank volume
Refuelling Signal, Bak D: 897 l
Refuelling Signal, Bak Pl: 1091 l
Refuelling Signal, Bak Ppr: 973 l
Emergency Reserve Signal, Bak R: 270 l
Weight: 5.1 ±0.5 kg
Passports: 7 pcs
Technical Documentation: Product passports, operating manual, aircraft fuel system documentation

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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.