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NAA bypass pin, often marked with a “Remove Before Flight” flag, is a safety device inserted into an aircraft’s nose landing gear to disconnect the hydraulic steering system during towing or pushback. It allows ground crews to turn the aircraft freely, preventing damage to the steering actuators and tow bar.
•Purpose: It prevents the flight crew from engaging the nose wheel steering, which would conflict with the tug steering and could damage the nose gear or injure personnel.
•Operation: When inserted, the pin hydraulically “bypasses” the steering cylinder, allowing the wheels to swivel freely.
•Location: It is placed on the nose landing gear assembly, usually near the steering actuator.
•Safety: It ensures the aircraft remains manageable during ground operations.
•Removal: It must be removed before flight to restore the pilot’s control of the nose steering.
Failure to use a bypass pin when the hydraulic system is active can lead to severe equipment damage or injuries.
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