landing gear, wheel, brakes , tyre

#18. Creep (slippage):

• Acan damage the braking system.
• Bcan be measured by painting marks on the tyre and wheel rim.
• Cmay cause excess wear.
• Dnever occurs on new tyres

#1. Oil is used in an oleo strut to:

• Asupport the weight of the aircraft
• Blimit the speed of compression of the strut
• Clubricate the piston within the cylinder.
• Dlimit the speed of extension and compression of the strut

#2. The nose wheel assembly must be centered before retraction because:

• Athere is limited space in the nose wheel bay
• Bthe aircraft may swerve on the next landing if the nose wheel is not straight.
• Cthe tyres may be damaged on landing if the nose wheel is not straight.
• Dit will remove any slush or debris which may have accumulated on take-off.