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Questions and Answers
What mechanism holds the landing gears in the retracted position during normal flight?
What mechanism holds the landing gears in the retracted position during normal flight?
- Hydraulic pressure system
- Pneumatic actuator
- Mechanical locking system (correct)
- Electrical locking device
What occurs when the landing gear control lever is in the off position?
What occurs when the landing gear control lever is in the off position?
- The gears deploy automatically
- The hydraulic pressure is increased
- The gears are isolated from the hydraulic system (correct)
- The electrical system takes over control
At what airspeed does the safety valve close to isolate the hydraulics from the landing gear?
At what airspeed does the safety valve close to isolate the hydraulics from the landing gear?
- 200 knots
- 300 knots
- 250 knots (correct)
- 350 knots
Which of the following statements is true regarding hydraulic pressure during normal flight?
Which of the following statements is true regarding hydraulic pressure during normal flight?
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What happens in an electrical system when there is no lever off position?
What happens in an electrical system when there is no lever off position?
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Study Notes
Landing Gear Isolation
- During normal flight, landing gears on most aircraft are isolated from hydraulic pressure
- A mechanical locking system (e.g., an uplock hook) keeps the landing gears retracted
- Aircraft with three-position landing gear control levers isolate the gears from the hydraulic system when the lever is moved to the "off" position
- In electrically controlled systems without an "off" position, hydraulic supply is automatically shut off when airspeed reaches approximately 250 knots
- A safety valve closes at this airspeed, cutting off hydraulic supply to the selector valves
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