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Questions and Answers
Which hydraulic system is used if system A and/or B pressure is lost?
Which hydraulic system is used if system A and/or B pressure is lost?
- None of the above
- System B
- System A
- Standby system (correct)
How are the system A and B reservoirs pressurized?
How are the system A and B reservoirs pressurized?
- By engine fuel
- By electric motor
- By bleed air (correct)
- By hydraulic power
Which engine powers the system A engine-driven pump?
Which engine powers the system A engine-driven pump?
- No.2 engine
- Neither engine
- Both engines
- No.1 engine (correct)
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Study Notes
- The airplane has three hydraulic systems: A, B, and standby.
- Standby system is used if system A and/or B pressure is lost.
- Each hydraulic system has a fluid reservoir located in the main wheel well area.
- System A and B reservoirs are pressurized by bleed air.
- Both A and B hydraulic systems have an engine-driven pump and an AC electric motor-driven pump.
- The system A engine-driven pump is powered by the No.1 engine and the system B engine-driven pump is powered by the No.2 engine.
- An engine-driven hydraulic pump supplies approximately 6 times the fluid volume of the related electric motor-driven hydraulic pump.
- The ENG 1 or ENG 2 pump ON/OFF switch controls the engine-driven pump output pressure.
- The ELEC 2 or ELEC 1 pump ON/OFF switch controls the related electric motor-driven pump.
- If an overheat is detected in either system, the related OVERHEAT light illuminates.
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