FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Question: 1 / 1030

If the moisture separator does not vent accumulated water when the compressor shuts down in a high pressure pneumatic system, what is a likely cause?

Blocked vent

Malfunctioning solenoid dump valve

In a high-pressure pneumatic system, the moisture separator needs to vent accumulated water when the compressor shuts down to prevent damage to the system. If the moisture separator does not vent the water, a malfunctioning solenoid dump valve is a likely cause. The solenoid dump valve is responsible for releasing the accumulated water from the moisture separator when the compressor is not running. A blocked vent, low compressor output, or a faulty moisture separator would not directly prevent the moisture separator from venting water when needed.

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Low compressor output

Faulty moisture separator

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