Powerplant · Lesson 31 of 40
Engine Instrument Systems
How engine pressures, temperatures, speeds, fuel flow and power are sensed and shown, from Bourdon tubes and thermocouples to EPR, torquemeters, EICAS, ECAM and FADEC, plus range markings and what a mechanic may and may not do to an instrument.
12 min read
Last reviewed
Part of A&P Complete
This lesson is in the full course
- Explain how Bourdon tubes, diaphragms, resistance bulbs and thermocouples sense engine pressures and temperatures
- Describe how engine speed, fuel flow, EPR and torque are measured on piston and turbine engines
- Recognize common indication faults, such as a high-resistance EGT circuit or a clogged injector on a pressure-type flow gauge
- Compare annunciator panels, EICAS, ECAM and FADEC and what each does
- Interpret engine instrument range markings and apply 14 CFR 65.81 and Part 43 to instrument work