The gyro suction range changes at what altitude threshold?

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Multiple Choice

The gyro suction range changes at what altitude threshold?

Explanation:
Gyro instruments rely on a vacuum (suction) system driven by the engine, and the acceptable suction range isn’t fixed at all altitudes. As you climb, ambient pressure drops and the vacuum pump’s ability to maintain the same suction changes, so the acceptable range for gyro suction is adjusted at a specific altitude. That threshold is 15,000 feet. Below this altitude, the gyro suction can stay within the standard limits, but above it the required range shifts to account for the lower air density and pump performance. The other altitudes listed aren’t the standard demarcation point used in typical aircraft manuals.

Gyro instruments rely on a vacuum (suction) system driven by the engine, and the acceptable suction range isn’t fixed at all altitudes. As you climb, ambient pressure drops and the vacuum pump’s ability to maintain the same suction changes, so the acceptable range for gyro suction is adjusted at a specific altitude. That threshold is 15,000 feet. Below this altitude, the gyro suction can stay within the standard limits, but above it the required range shifts to account for the lower air density and pump performance. The other altitudes listed aren’t the standard demarcation point used in typical aircraft manuals.

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