Landing Gear Operation and Construction I
What is the purpose of landing gear on an aircraft?
supports the aeroplane during ground operations, dampens vibrations when the aeroplane is being taxied or towed, and absorbs landing forces, transmits the braking forces to the aeroplane structure.
What is Camber?
Camber angle is the angle made by the wheels of an aircraft; specifically, it is the angle between the plane of rotation of the wheels and the vertical axis of the aircraft when viewed from the front or rear.
What are 3 types of non-shock absorbing landing gear?
Rigid, Bungee, spring Steel
What component is used to take lateral loads on the MLG?
Side Brace
What component positions the landing gear assembly in a certain position prior to landing gear retraction
hydraulically operated tilt actuator
Landing gear can be classified into two broad configurations:
Tricycle type landing gear (nose wheel)
Tail wheel type landing gear (also known as conventional gear).
Where is the location of the CoG on a Conventional landing gear aircraft?
Aft of the MLG
What are the two most common types of shock strut?
Spring-oleo
Oleo pneumatic
What attached the retractable landing gear to the fuselage?
Trunnion
The drag strut is designed to......?
stabilise the landing gear assembly longitudinally in the fore-and-aft direction.
Where is the location of the CoG on a tricycle landing gear aircraft?
forward of the MLG
The main landing gear may include a combination of what systems?
wheels, shock-absorbing equipment, brakes, retracting mechanism, controls, warningdevices and cowling
What part of an oleo supports the aircraft weight on the ground and during taxiing?
Spring or compressed gas
What component centers the nose wheel when weight is lifted off the NLG?
Nose Wheel Steering Centring Cam
What does the shimmy damper do?
decreases shimmy between the inner and outer shock strut cylinders during high-speed taxiing and heavy brake operation
What are the advantages of Tricycle Landing Gear?
This arrangement places the aircraft fuselage in a level attitude when on the ground. The pilot has good forward visibility, and the cabin area is level for ease of passenger movement inside the aircraft. This configuration also makes the aircraft stable during ground operations and easy to control because the aircraft’s centre of gravity (CG) is forward of the main wheels.
What system controls the steerable tail wheel
Rudder
what does the statement "Struts are usually designed to be progressive" mean?.
This means when a strut starts compressing, it is soft. The more it is compressed, the harder it becomes. A tapered metering pin assists to reach a progressive characteristic.
What is the function of the landing gear torque links?
The torque links limit the extension of the piston during gear retraction and hold the wheels and axle in a correctly aligned position in relation to the strut
Name 5 components in an aircraft extension retraction hydraulic system, not including the power generation system?
A selector valve
A downlock actuator
A retract actuator
A door un-latch actuator
Door actuators
An up-lock actuator
Sequence valves
Restrictors and check valves
What is wheelbase and wheel track?
Wheelbase means the distance through the wheel axle of the main landing gear to the centre of the nose gear or tail gear.
Wheel track means the distance between the far left and far right main wheel. In the case of tandem wheels, track is the distance measured to the centre of the bogie beam..
What protects the stabiliser bulkhead and fuselage structure when the aeroplane over-rotates during take-off or high-nose-up attitude landings
Tail Skid
During landing phase, when does strut compression stop?
When the pressure of the nitrogen produces a force on the strut surface thatequals the power exercised by the aeroplane mass
What is toe in and toe out
Tow-in and tow-out refer to the path a main wheel takes in relation to the airframe longitudinal axis.
What is the purpose of the walking beam?
To alleviate the need for a hefty support structure to take the retraction loads, thus reducing weight and space. The actuator and walking beam operate together to lift and lower the main landing gear (MLG). The walking beam decreases the force that goes to the structure during actuator operations.