FAA Powerplant Written Practice Test

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Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

Practice this question and more.

Which instrument plays a crucial role in indicating overspeed conditions in a gas turbine engine?

Oil pressure gauge
Exhaust gas temperature indicator
Tachometer
Fuel pressure indicator

The correct answer is: Tachometer

The tachometer is essential for indicating overspeed conditions in a gas turbine engine because it measures the rotational speed of the engine's components, typically in revolutions per minute (RPM). By continuously displaying the engine speed, the tachometer allows operators to monitor if the engine is operating within safe parameters. If the RPM exceeds the manufacturer's specified limits, this indicates an overspeed condition, which can lead to engine damage or failure. Thus, the tachometer serves as a critical tool for ensuring the safe operation of the engine by providing real-time feedback on the engine's performance. Other instruments like the oil pressure gauge, exhaust gas temperature indicator, and fuel pressure indicator provide important information regarding engine health and performance but do not specifically measure rotational speed or directly indicate overspeed conditions.