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How to Install an Aircraft Engine Temperature Gauge

A pilot must have instant access to engine temperature information throughout the flight in order to prevent possible mishaps. Engine temperature is determined by sensors that monitor crucial engine parameters, such as exhaust gas or cylinder head temperatures. These sensor signals are routed to the cockpit where a real-time visual output is displayed on an analog gauge. Temperature gauges are available in either a round or rectangular design. The type of sensor used and engine temperature parameter indicated on the gauge depend on the type of aircraft; however, the construction of the analog gauge housings follows a basic 2.25-inch diameter standard.

Things You'll Need

Phillips head screwdriver
Allen key set
General purpose cleaner
Lint-free rags
New engine temperature gauge with documentation

Instructions

- 1
  Terminate all sources of electricity from the aircraft's electrical power system, including the engine, generator, battery, external power supply and auxiliary power unit, if installed.
- 2
  Remove the old aircraft temperature gauge by loosening the four fasteners, one on each corner, and disconnecting the wiring in the back. Depending on the model, there may be power, ground, dimming and sensor input wires. Clean the instrument panel around the temperature gauge orifice with a general cleaning compound and lint-free rag.
- 3
  Inspect the nuts that secure the temperature gauge hardware to the instrument panel, whether clip-on, anchor or other design. Replace any worn nuts prior to installing the gauge.
- 4
  Verify that the location on the instrument panel is acceptable for the engine temperature gauge per Federal Aviation Administration advisory circular 43.13.
- 5
  Ensure that the new temperature gauge is compatible with the aircraft. The new gauge's documentation will list compatible temperature sensors and power requirements. Compare this information to the data in the aircraft's maintenance logbook.
- 6
  Connect the power and ground wires to the power and ground inputs of the new temperature gauge. If the new temperature gauge supports light dimming, connect the panel light dimmer potentiometer harness wires to the temperature gauge.
- 7
  Connect the sensor input wiring from the engine temperature sensor to the temperature gauge, whether by electrical connector plug or direct wiring. It is imperative that this connection is made correctly.
- 8
  Mount the temperature gauge in the instrument panel. Tighten the four fasteners, one on each corner, with either a small Philips head screwdriver or an Allen key, to secure the gauge. These fasteners are typically constructed of brass and cross-thread easily.
- 9
  Test and calibrate the temperature gauge to manufacturer's or the aircraft's specifications. This may include a simple power-on test or a complete engine run.
- 10
  Complete the appropriate documentation of the maintenance action required by 14 CFR Part 43 Section 43.9.

Aviation