Engine instruments

Question 1

Identify reasons for an abnormality in the CHT and state pilot actions (if any) to rectify a problem.

Answer 1

CHT measures heat energy wasted during the power stroke, when the cylinder is under maximum stress from high internal pressures and temperatures. High CHTs generally indicate that the engine is under excessive stress. To rectify the problem we can reduce power, climb less steeply, enrichen the mixture. If problem is not rectified land as soon as possible.

Question 2

Identify reasons for an abnormality in the fuel pressure gauge and state pilot actions (if any) to rectify a problem.

Answer 2

Failure of fuel pump may cause this, or a tank on low fuel. Make sure fuel pump is turned on. Land as soon as possible.

Question 3

Identify reasons for an abnormality in the tachometer gauge and state pilot actions (if any) to rectify a problem.

Answer 3

The red line on the tachometer indicates the max RPM allowed for the engine. If engine RPM approaches the red line, the throttle should be closed sufficiently to prevent overspeed. This condition is most likely to occur during high speed - high power combinations.

Question 4

Identify reasons for an abnormality in the load meter and state pilot actions (if any) to rectify a problem.

Answer 4

Load meter reflects the total percentage of the load placed on the generating capacity of the electrical system by the electrical accessories and battery.

Question 5

Identify reasons for an abnormality in the voltmeter and state pilot actions (if any) to rectify a problem.

Answer 5

Voltmeter indicates the voltage in the electrical system. If a fault occurs that causes the voltage to rise to dangerous levels an overvoltage warning light illuminates. The pilot should turn off the alternator and allow the system to operate off the battery. The flight should be terminated and the fault reported.