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Thermocouple USA, Inc. part numbers (P/N) 6897962TUSA, 23067633TUSA, 23075403TUSA are Turbine Inlet Thermocouple often referred to as a TIT Thermocouple Assemblies. They are a direct replacement for the Rolls-Royce Allison thermocouple assembly P/N 6897962, 23067633, 23075403H. They are used on the Rolls-Royce Allison T56/501 gas turbine engines, currently in use on various military and civilian aircraft. These types of thermocouple assemblies can come in air cooled and non-air cooled versions. Part numbers 6897962, 23067633, 23075403 are the air cooled version.

Aircraft using the T56/501 gas turbine include certain models of the C130 Hercules, C-2 Greyhound, E-2 Hawkeye, and P-3 Orion as well as Canada's Aurora. Aircraft using the 501D version of the engine include models of the L-100, L-188 Electra, and Convair 580 & 5800. Manufacturing is done pursuant to a Federal Aviation Administration Parts Manufacturing Approval (PMA) number PQ2422NM. Including the 501K gas turbine generator.

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