AM.III.D.K6

From the FAA library

• Aviation Maintenance Technician Handbook - Powerplantp. 10-55
  Chapter 10: Engine Maintenance & Operation › Engine Ratings › Torquemeter (Turboprop Engines)

  Torquemeter (Turboprop Engines) Only 10 to 15 percent of the thrust produced by a turboprop engine is from propulsive force derived from the jet thrust exiting the exhaust. Engine pressure ratio is not used as an indicator of the power ... produced by a turboprop engine. Turboprops are usually fitted with a torquemeter that measures torque applied to a shaft turned by the gas generator and power turbines of the turbine engine. The torquemeter can be operated by engine oil pressure…

• Aviation Maintenance Technician Handbook - Powerplantp. 10-59
  Chapter 10: Engine Maintenance & Operation › Turboprop Operation

  much alike. The turboprop chiefly requires attention to engine operating limits, the throttle or power lever setting, and the torquemeter pressure gauge. Although torquemeters indicate only the power being supplied to the propeller and not the equivalent shaft horsepower, torquemeter ... approximately proportional to the total power output and, thus, is used as a measure of engine performance. The torquemeter pressure gauge reading during the takeoff engine check is an important value. It is usually necessary to compute the takeoff power…

• Pilot's Handbook of Aeronautical Knowledgep. 7-22
  Chapter 7: Aircraft Systems › Turbine Engines › Torquemeter

  Torquemeter Turboprop/turboshaft engine power output is measured by the torquemeter. Torque is a twisting force applied to a shaft. The torquemeter measures power applied to the shaft. Turboprop and turboshaft engines are designed to produce torque for driving a propeller ... Torquemeters are calibrated in percentage units, foot-pounds, or psi. N1 Indicator N1 represents the rotational speed of the low pressure compressor and is presented on the indicator as a percentage of design rpm. After start, the speed…