IR-117M

IR-117M engine operating mode meter

IR-117M is an aircraft engine operating mode meter used in helicopter engine control and indication systems. The instrument helps the crew monitor engine operating modes by measuring air pressure downstream of the compressor. This pressure is used as one of the main reference parameters for assessing the current operating condition of the engine. The unit is intended for cockpit indication and mode monitoring, not for direct mechanical control of fuel supply or engine actuators.

Compressor pressure measurement through IR-117M

The instrument receives pressure data from dedicated pressure receivers connected to the compressor outlet air line. The measured value is displayed to support selection and maintenance of engine operating modes during flight and ground operation. Since compressor outlet pressure changes with engine load and flight conditions, the meter uses correction inputs to provide a more reliable indication. These corrections help the system account for altitude and temperature effects, instead of showing pressure as an isolated value.

IR-117M with altitude and temperature correction sensors

The system operates together with a DVK altitude correction sensor, PM-10MR pressure receivers and a P-1 temperature receiver. These elements form a combined measuring chain for engine mode indication. The pressure receivers provide compressor outlet pressure input, the altitude sensor supports static pressure correction, and the temperature receiver adds correction for air temperature. If the indication is unstable or outside expected values, the check should include the instrument, pressure lines, sensors, wiring and correction circuits.

Aircraft application of IR-117M

The instrument is used on helicopters equipped with compatible engine indication systems, including Mi-8 family platforms. It provides information needed for takeoff, nominal and cruise engine operating modes. Exact applicability depends on the installed engine type, aircraft modification and configuration of the onboard indication system. Similar aircraft may use different versions of engine mode instruments, so replacement should be confirmed by the aircraft maintenance documentation, engine documentation or system passport.

Identification and ordering of IR-117M

Before ordering, the full marking and set configuration should be checked. A complete supply set may include the operating mode indicator, altitude correction sensor, pressure receivers and temperature receiver. For correct selection, provide the helicopter type, engine type, installed indication system, existing instrument marking and available passport data. The product is also known under alternative designations IR-117M and ИР-117М.

Product Type: Engine operating mode meter
Function: Measurement and assessment of engine operating modes by compressor outlet air pressure
Application / Where Used: Helicopter engine control and indication systems
System / Installation Area: Engine control and indication system
Measured Parameter: Compressor outlet air pressure
Pressure Measurement Range: 5–10 kgf/cm²
Working Pressure Range: 5.25–8.25 kgf/cm²
Pressure Measurement Accuracy: ±0.15 kgf/cm²
Number of Measuring Channels: Three independent channels
Operating Voltage: 27 V DC ±10%
Current Consumption: Not more than 0.3 A
Backlight Power Supply: 5.5 V DC or AC
Backlight Current Consumption: Not more than 0.6 A
Operating Temperature Range: −60 to +80 °C
Weight: 2.5 kg
Assigned Resource: 500 h
Assigned Service Life: 6 years
Storage Life: 5 years
Scope of Supply: UR-117M operating mode indicator; DVK altitude correction sensor; PM-10MR pressure receivers, 2 pcs; P-1 temperature receiver
Alternative Designations: IR-117M; ИР-117М
Technical Documentation: Manufacturer passport and technical documentation

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

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.