PK-6

PK-6 function in thermocouple circuits

The main function of PK-6 is to provide a transition point for compensation thermoelectrode wires coming from engine thermocouples. In exhaust gas temperature systems, very small thermoelectric signals are used, so ordinary wire joints can introduce measurement error if the connection is not arranged correctly. The transition block helps reduce the influence of ambient temperature at the junction between thermocouple wiring and the aircraft harness. This is why PK-6 should be treated as part of the measuring system, not just as a simple connector.

PK-6 in the 2IA-6 temperature system

PK-6 is used in dual exhaust gas temperature measuring systems such as 2IA-6. In this chain, thermocouples installed in the gas path of TV2-117 or TV3-117 engines send thermoelectric signals through the wiring to the PK-6 transition blocks. From there, the signal goes to the 2UE-6B amplifier and then to the 2UT-6K cockpit indicator. The same temperature system may also work alongside RT-12-6 engine temperature regulators. A fault in this area can look like a bad indicator or amplifier, so the transition block and wiring should also be checked.

Aircraft application of PK-6

PK-6 is mainly associated with Mi-family helicopters, including Mi-8, Mi-17 and Mi-24. It is used in onboard cable routes that connect the engine compartment, nacelle area or powerplant wiring with fuselage equipment and cockpit indication circuits. These locations are exposed to vibration, temperature changes and contamination from aviation fluids, so contact condition and correct wiring are important. The exact installation depends on the helicopter modification, engine type and temperature measurement system fitted on the aircraft.

Identification and ordering of PK-6

Before ordering PK-6, the marking should be checked against the aircraft parts catalog and the temperature measurement system diagram. This is especially important because “PK-6” may also refer to ordinary industrial terminal blocks that are not suitable for aircraft temperature measurement systems. For correct selection, provide the helicopter type, engine type, associated system such as 2IA-6, and the required part number from the logbook or parts list. The product is also known under alternative designations PK-6 and ПК-6.