P-77 Version 2

Retained product information

P-77 Version 2 temperature receiver for aircraft systems P-77 Version 2 is an aircraft temperature receiver used for measuring the temperature of liquids and gases in engine and aircraft system circuits. The receiver is installed at the temperature measurement point and converts temperature changes into changes of electrical resistance. This signal is then used by the associated indication or monitoring equipment. In engine applications, the unit may be installed on the engine accessory gearbox and used for oil temperature measurement at inlet and outlet points. Temperature measurement through P-77 Version 2 The receiver operates as a resistance temperature sensing element. When the temperature of the measured medium changes, the resistance of the sensitive element changes as well. The connected aircraft instrument reads this resistance change and displays or processes the temperature value. The receiver does not provide visual indication by itself and does not control oil, fuel or gas flow. Its function is to provide a stable temperature signal for the aircraft temperature measuring circuit. P-77 Version 2 platinum sensing element The sensitive element of the receiver is made from platinum wire wound on mica plates. The mica structure provides electrical insulation and mechanical support for the winding. The plates are clamped with spring plates and protected inside the receiver body. This construction gives the unit stable resistance characteristics and allows it to work in aviation environments with vibration and temperature changes. The receiver is made as a one-piece component, with a plug used for connection to the external circuit. Aircraft application of P-77 Version 2 P-77 Version 2 is used in aircraft systems where the temperature of oil, liquids or gases must be monitored. In engine installations, it is commonly associated with oil temperature measurement at the inlet and outlet of the engine unit box or related oil circuits. Exact applicability depends on the aircraft type, engine configuration and installed temperature indication system. Before replacement, the measuring range, resistance characteristic, mounting position and connector type should be checked against the technical documentation. Identification and ordering of P-77 Version 2 Before ordering, the full designation should be verified, including the version number. P-77 Version 2 may look similar to other temperature receivers but differ by resistance characteristic, installation length, connector arrangement or approved temperature range. For correct selection, provide the aircraft type, engine type, installation point, existing receiver marking and a photo of the unit or passport entry if available. The product is also known under alternative designations P-77 Version 2 and П-77 вариант 2.

P-77 Version 2: purpose and identification

P-77 Version 2 is a Temperature Sensor that converts the temperature of the monitored medium into a signal for the associated instrument or system. The exact execution is determined by the complete marking, series and documentation. A similar housing, common opening characters or a related function does not establish matching ratings.

This category contains different equipment classes: temperature receivers, thermometers, air- and liquid-pressure receivers, regulators and individual measurement units. The actual function of the item is therefore more important than the broad category name. Read the designation with every letter, digit, hyphen, version and series reference preserved.

Function in the measurement system

The item converts the temperature of the monitored medium into a signal for the associated instrument or system. It is not necessarily a stand-alone indicator; depending on the design, it may operate with a remote indicator, regulator, pressure line or measurement set. The applicable documentation defines the circuit, medium, supply, range and connection arrangement.

For a temperature item, confirm the sensing principle, monitored medium, range and compatible indicator. For a pressure receiver, also confirm pressure type, channel count, ports, heating, drainage and connected lines. An RF measurement receiver must be selected by its own radio-frequency data rather than by requirements intended for an aircraft pressure or temperature sensor.

Selection by designation

Before ordering, compare the primary and alternative designations, execution, range, output, electrical supply, connector or ports, mounting, dimensions and mass whenever documented. Numerical values in Technical Details are retained from the previous card or a supporting source and must be checked against the passport for the actual unit.

Related modifications may differ in channel count, resistance, calibration, working medium, measurement limit, heater voltage or mounting interface. Do not treat them as interchangeable without an explicit documentary reference. General technical background is available under Temperature Sensor.

Pre-installation inspection

Incoming inspection includes checking the marking and documentation and examining the housing, sensing element, connector, pressure ports, drainage holes, mounting points and seals as applicable. Reject or investigate cracks, deformation, corrosion, contaminated passages and damaged contacts. Test the unit under the approved procedure for the exact execution.

After installation, check line tightness or electrical continuity, routing of pressure lines and wiring, and then perform the prescribed functional test. External integrity alone does not establish measurement accuracy. Assign an aircraft application only when supported by a passport, illustrated parts catalogue or maintenance document.

Related catalogue positions

Functionally related products include P-64, P-102 / P102-MS-400, P-63, P-109. They are grouped by measurement function for navigation and do not imply interchangeability. More items are listed in the Pressure & Temperature Sensors category.

Enquiry information

An enquiry for P-77 Version 2 should state the complete designation, quantity, required condition, marking photograph, delivery scope and required documents. When available, identify the associated indicator, regulator or system. Price, actual availability, condition, lead time and documentation are confirmed separately for the offered unit.