EASA Gas Turbine Engine Practice Test

To maintain the selected RPM of a gas turbine at altitude,

The pilot will have to throttle back The fuel will automatically be reduced as the aircraft climbs More fuel will automatically be added RPM will adjust automatically with altitude

Correct Answer:

The fuel will automatically be reduced as the aircraft climbs

Explanation:

The key idea is that engine speed is controlled by fuel flow through the fuel control or governor, and ambient air density affects how much air is available for combustion. As the aircraft climbs, air becomes thinner, supplying less mass flow for the same rotor speed. To keep the selected RPM constant, the fuel control automatically trims fuel down. If fuel weren’t reduced, the reduced air mass could allow the turbine to overspeed or run hotter, so the automatic fuel reduction keeps the target RPM steady. The pilot doesn’t need to throttle back manually, and RPM isn’t allowed to drift with altitude—the system holds the chosen speed by reducing fuel as you climb.

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