11.13 - Landing Gear Flashcards
Which component of the landing gear supports most of the wait of the aircraft when it’s on the ground
The shock strut
How is the action of the shock strut controlled
Gas in the strut provides the shock absorbing function and the oil passing through various passageways provided dampening
What is the purpose of the landing gear shortening mechanism
To shorten the gear during retraction, to fit in the wheel well and to increase engine ground clearance
Which safety device are in place to prevent the landing gear from being moved into the up position when on the ground
The landing gear selector is physically prevented from being moved to the up position on the ground
What is the function of the landing gear solenoid control safety valve
To block the hydraulic supply to the landing gear system at high speeds
Which component transfers the tyre pressure information from the rotating point of the wheel to the fixed part
Tyre pressure transducer
If the auto brake system is set to auto, when does it start to operate
As soon as the auto speed break system extends the spoilers
What is the purpose of the body gear or centreline gear
To spread the aircraft weight over a greater area
How is it ensured that the nose leg is correctly positioned before retraction
A set of cams centre the nose wheels as the leg extends
Which cockpit indicator is given when the landing gear is all extended and locked
A green light for each leg
Which statement is correct regarding the control of the nose wheel steering
The rudder pedals give less deflection than the tiller
What happens if the break peddles are manually depressed during auto breaking
The auto brake function disengages and the brakes are controlled as normal by the crew
If access to the undercarriage bays of an aircraft is required on the ground, how can the doors be opened
The doors can be unlocked manually by releasing the up lock so they fall under gravity
What are the advantages of a nose tricycle gear system over a tail system
Directional stability
Higher landing speeds
Greater decrease in lift after touchdown
Better visibility during taxi and landing
What is the function of gas in a shock absorber
It acts as the spring to absorb shock
What effect will thrust reverse have on the auto braking system
The auto brake will reduce brake pressure to keep the preselected deceleration rate
What is the function of a hydraulic accumulator
To dampen fluctuations in the system
What type of load does a static seal withstand
Steady or pulsating loads
What is the purpose of the booster pump impeller of a hydraulic pump
Positive pressure to prevent cavitation of pump
When are the landing gear doors normally open
During extension and retraction
The main purpose of the shock strut is to
Support the aircraft on the ground and absorb shocks on landing
The function of the torsion links on the main gear is to
Allow the inner cylinder to move up and down in the outer cylinder but not rotate
What is the purpose of the torsion links on damper
To counteract wheel shimmy
What is the function of the drag strut
To stabilise the shock strut in the for and aft direction
On most aircraft the main landing gear is kept in a retracted position during flight by
There is a mechanical up lock roller that engages the leg and holds it in the retracted position
The function of the wiper/scrapper ring is too
Keep all unwanted material out of the shock strut during compression
Dynamic seals are used for
Seal the inner cylinder to the gland housing in areas with linear or rotational movement
What does the inflight braking system do
It stops the wheel rotation during retraction
Which is the main advantage of nose wheel type undercarriage
It allows for better breaking
What component transfers the tyre pressure information from the rotating part of the wheel to the fixed part
The tyre pressure transducer
What is the function of torsion links on a main gear
It allows the inner cylinder to move up and down in the outer cylinder but not rotate
What does a red light on the landing gear position indicator mean
The gear is not locked
