Aircraft Landing Gear Systems Flashcards
7 cards from real AMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Aircraft Landing Gear Systems flashcards as text
What is the primary purpose of a shimmy damper on aircraft landing gear?
Answer: To prevent oscillation of the nose wheel assembly
A shimmy damper dampens nose wheel oscillations (shimmy) that can occur during ground operations by providing hydraulic resistance to rapid lateral movement.
In an oleo-pneumatic shock strut, landing shock is cushioned primarily by:
Answer: Nitrogen gas compression and hydraulic fluid metering through orifices
Oleo-pneumatic struts use compressed nitrogen gas and hydraulic fluid forced through metering orifices to absorb and dissipate landing shock energy during compression.
Torque links (scissors links) on an oleo shock strut serve to:
Answer: Prevent rotation of the piston while allowing axial (vertical) movement
Torque links connect the inner and outer cylinders of an oleo strut, preventing rotational movement of the piston while allowing it to move axially for shock absorption.
What type of landing gear arrangement is most commonly used on modern large transport aircraft?
Answer: Retractable tricycle gear
Retractable tricycle gear is standard on modern transport aircraft because it reduces aerodynamic drag in flight and provides stable ground handling with good pilot forward visibility.
The purpose of a downlock in a retractable landing gear system is to:
Answer: Hold the landing gear in the fully extended position during flight
A downlock mechanically secures the landing gear in the fully extended position during flight, preventing inadvertent retraction or collapse under aerodynamic or asymmetric loads.
Proper aircraft wheel bearing preload is important because:
Answer: Proper preload prevents both excessive play and heat buildup from overtightening
Correct bearing preload eliminates excessive looseness (which causes wobble and impact loading) while avoiding overtightening (which causes friction heat buildup and premature bearing failure).
An anti-skid brake system prevents wheel lockup by:
Answer: Automatically releasing and reapplying brake pressure to allow the wheel to spin up
Anti-skid systems monitor wheel deceleration rates to detect impending lockup, then momentarily reduce brake hydraulic pressure to allow the wheel to regain traction before reapplying pressure.