FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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If the liquid level gauge in a vapor cycle cooling system indicates a low freon charge, the system should

  1. be immediately refilled with freon

  2. be checked for leaks before any operation

  3. be operated to reach a stable condition and then rechecked

  4. be shut down and not used until serviced

The correct answer is: be operated to reach a stable condition and then rechecked

Checking for leaks before operation, as suggested in B, may not address the issue of a low freon charge. If the system is immediately refilled with freon as suggested in A, it may not fix the underlying issue causing the low charge. Shutting down and not using the system, as stated in D, is an extreme measure and should only be done if the system is not safe to operate. Allowing the system to reach a stable condition and then rechecking, as advised in C, allows for a more accurate assessment of the freon charge and helps identify any potential leaks that may have caused the low charge.

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