FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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What controls the order of gear and fairing door operation in most modern hydraulically actuated landing gear systems?

  1. Hydraulic pumps

  2. Pilot control lever

  3. Electrical switches

  4. Sequence valves

The correct answer is: Sequence valves

Sequence valves control the order of gear and fairing door operation in most modern hydraulically actuated landing gear systems. Hydraulic pumps, pilot control lever, and electrical switches do not directly control the order of operation and have other functions in the landing gear system. For example, hydraulic pumps supply the necessary pressure for the system to work, pilot control lever allows the pilot to manually operate the landing gear, and electrical switches control the activation of other components in the system. However, sequence valves are specifically designed to control the order of operation and ensure proper sequencing of the gear and fairing doors. Therefore, they are the correct answer to this question.

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