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Which of the following is capable of using air from the pneumatic system on a motorized aircraft?

1. Cabin heater
2. Electric generator
3. Hydraulic pumps
4. Defrost system
5. Gyroscopic instrument
6. Static/Pitot instrument

  • A

    1, 2 and 3

  • B

    1, 2, 3, 4, 5 and 6

  • C

    2 only

  • D

    1, 3, 4, 5 and 6

Air-driven or pneumatic systems encompass all systems powered by air or compressed gas. Operating akin to hydraulic systems, pneumatic systems utilize controlling valves, filters, and selector valves. They are classified into three categories:

  • The first category contains systems driven by a constant supply of compressed air, usually derived from engine-driven compressor pumps or gas turbine engine compressor bleeds.
    • Heating
    • Instruments
    • Hot air anti-icing
    • De-icing
    • Air starting systems
    • Hydraulic reservoir presurisation
  • The second category comprises systems that utilize bottled nitrogen or another inert gas as their primary operating mechanism.
    • Fire extinguishers
    • Life jackets
    • Floatation equipment
    • Life rafts
  • The third category is "Vacuum pumps" which provide vacuum for gyroscopic instruments.

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