P-109

P-109 aircraft resistance temperature sensor

P-109, including P-109M1 and P-109M4 modifications, is an aircraft resistance temperature sensor used to measure temperature of non-aggressive liquid and gaseous media. The sensor converts changes in medium temperature into electrical resistance signals for aircraft monitoring and control systems. It can be used with air, fuel, oil and other approved working media depending on the installation and system documentation.

Function of the P-109 temperature receiver

The main function of P-109 is temperature measurement in aircraft systems and transmission of temperature data to onboard equipment. The unit works as a resistance thermometer: the sensing element changes its resistance according to the temperature of the surrounding medium. The resulting electrical signal is used by control, indication or monitoring systems for thermal regulation, engine protection, air-system control or fuel and oil temperature correction.

P-109 sensor construction

P-109 is a two-channel temperature sensor with two independent electrical circuits. The source context describes its sensing element as a platinum resistance element with a 100P characteristic according to GOST. The internal structure includes an insulated tubular frame with bifilar winding of platinum wire inside a sealed protective metal housing. The design is non-disassemblable and intended for direct installation into aircraft pipelines, ducts or controlled equipment cavities.

Installation areas of the P-109 sensor

The P-109 temperature receiver is installed inside aircraft systems and fluid / gas lines. Typical installation areas include engine oil systems, gearbox oil systems, fuel lines, air-conditioning ducts and anti-icing air ducts. The working immersion part is placed directly into the controlled medium, while the body is fixed through a threaded connection and sealed with a gasket. The unit may also be installed on test benches or special ground equipment when the same temperature-control principle is required.

Examples of P-109 aircraft application

The source context links P-109 and its modifications with several Soviet and Russian aircraft systems. Examples include Tu-154M APU compartment heating and temperature-control systems, Il-76 / Il-86 / Il-96 tail-section and air-system monitoring, PS-90A engine oil temperature monitoring on Il-96-300, Tu-204 and Tu-214, MiG-31 fuel temperature monitoring during refueling, and Mi-8 / An-148 air-conditioning or anti-icing systems. Actual installation point depends on the aircraft modification and maintenance documentation.

Ordering and replacement of P-109

When ordering P-109, the buyer should specify the exact modification, such as P-109M1, P-109M2 or P-109M4, as well as the aircraft type, medium, temperature range and mounting interface. Since similar temperature sensors may differ by resistance characteristic, immersion length, connector or cable arrangement, replacement must be checked against the aircraft or engine documentation. Product passport, calibration data, test report, storage records and condition should be confirmed before supply.

Product Type: Aircraft resistance temperature sensor / temperature receiver
Designation: P-109
Alternative Designations: P-109M, P-109M1, P-109M2, P-109M4, П-109, П-109М, П-109М1, П-109М2, П-109М4
Function: Measurement of temperature of non-aggressive liquid and gaseous media
Measurement Principle: Resistance thermometer principle
Sensitive Element: Platinum resistance element
Resistance Characteristic: 100P according to GOST, according to source context
Number of Channels: 2 independent electrical measuring circuits
Output Signal: Two resistance-based electrical signals
Measured Media: Air, fuel, oil and other approved non-aggressive liquid or gaseous media
Application / Where Used: Aircraft monitoring systems, engine systems, oil systems, fuel lines, air-conditioning systems and anti-icing systems
Compatible Aircraft / Equipment: Tu-154M, Il-76, Il-86, Il-96, Tu-204, Tu-214, MiG-31, Mi-8, An-148 and other aircraft depending on documentation
Temperature Measurement Range: −60 °C to +300 °C, depending on modification
Upper Temperature Reference: Up to +250…+300 °C for selected modifications such as P-109M4, according to source context
Construction: Non-disassemblable sealed protective metal housing
Internal Design: Insulated tubular frame with bifilar platinum wire winding, according to source context
Immersion Part Length: About 87 mm, according to source context
Immersion Part Diameter: About 16 mm, according to source context
Mounting: Threaded connection through fitting with sealing gasket
Installation Orientation: Into the flow at an angle of not more than 60° to the pipeline axis, according to source context
Locking Method: Safety wire locking through body holes, according to source context
Weight: Not more than 0.14 kg
Related Equipment: 5747T signal units, BSCD monitoring systems, APU heating controls, PS-90A oil system and aircraft fuel / air systems depending on configuration
Condition: New / As-Stored / Serviceable, depending on availability
Technical Documentation: Product passport, calibration data, test report, storage records and aircraft system documentation if available

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