Aviation Mechanic - General, Airframe, and Powerplant › III. Powerplant › Task D. Engine Instrument Systems

AM.III.D.S8

Skill

Perform resistance measurements of thermocouple indication system.

Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - Airframe p. 16-56
Chapter 16: Cabin Environmental Control Systems › Vapor Cycle Air Conditioning › System Servicing
Water is removed from the system by evacuation. Anytime the system refrigerant charge falls below atmospheric pressure, the refrigerant is lost, or the system is opened, it must be evacuated before recharging. Evacuating a vapor cycle air conditioning system ... also known as pumping down the system. A vacuum pump is connected and pressure inside the system is reduced to vaporize any water that may exist. Continued operation of the vacuum pump draws the water vapor from the system…
Aviation Maintenance Technician Handbook - Powerplant p. 9-2
Chapter 9: Engine Fire Protection Systems › Engine Fire Detection Systems › Thermocouple Systems
Thermocouple Systems The thermocouple fire warning system operates on an entirely different principle than the thermal switch system. A thermocouple depends on the rate of temperature rise and does not give a warning when an engine slowly overheats ... short circuit develops. The system consists of a relay box, warning lights, and thermocouples. The wiring system of these units may be divided into the following circuits: (1) the detector circuit, (2) the alarm circuit, and (3) the test circuit…
Aviation Maintenance Technician Handbook - Powerplant p. 4-16
Chapter 4: Engine Ignition & Electrical Systems › FADEC System Description › Engine Indicating & Crew Alerting System (EICAS)
control channel within each ECU commands one of the two coil packs to control the ignition spark for the engine cylinders. [Figure 4-28] The high-voltage harness carries energy from the ECU spark towers to the spark plugs ... engine. For both spark plugs in a given cylinder to fire on the compression stroke, both control channels must fire their coil packs. Each coil pack has a spark plug from each of the two cylinders controlled by that…
Pilot's Handbook of Aeronautical Knowledge p. 7-16
Chapter 7: Aircraft Systems › Oil Systems
Systems The engine oil system performs several important functions: • Lubrication of the engine’s moving parts • Cooling of the engine by reducing friction • Removing heat from the cylinders • Providing a seal between the cylinder walls and pistons • Carrying ... away contaminants Figure 7-17. Wet-sump oil system. Reciprocating engines use either a wet-sump or a dry-sump oil system. In a wet-sump system, the oil is located in a sump that…
Aviation Maintenance Technician Handbook - Powerplant p. 2-2
Chapter 2: Engine Fuel & Fuel Metering Systems › Basic Fuel System
During starting, the boost pump forces fuel through a bypass in the engine-driven pump to the metering device. Once the engine-driven pump is rotating at sufficient speed, it takes over and delivers fuel to the metering device ... specified pressure. The airframe fuel system begins with the fuel tank and ends at the engine fuel system. The engine fuel system usually includes the engine-driven pumps and the fuel metering systems. In aircraft powered…