M11.13 Flashcards
Where is the location of centre of gravity for aircraft with nose wheel steering?
In front of the main wheels
Where is the centre of gravity for aircraft that have tail wheel steering?
Behind the main wheels
Why is it better to land with nose wheel steering?
- brake harder
- lower angle of attack
- see the runway
What is meant by main wheel loading?
When the main landing gear takes most of the weight
How main tyres does a bogie landing gear have?
More than 2
What is used to control aircraft steering?
Rudder pedals
What is the maximum angle for aircraft steering when using the pedals?
10°
When would you steer with the pedals?
When taking off or landing
What is the maximum angle for steering when using a tiller?
80°
What does the shock strut do?
It absorbs the shock on landing
What are the two telescopic cylinders of a main landing gear?
Inner and outer
What does the trunnions link do?
Transmits shock loads into the aircraft structure
What is the jo of the torsion link?
To allow for vertical movement but stop rotational moving
What is the drag strut used for?
To stabilise the shock strut
How is the side strut locked in position?
By being over centred and using the down lock mechanism (spring and actuator)
What is the job of the fluid metering device?
To control the speed of the actuators
What is the job of the downlock sensor?
To show when the landing gear is down and locked
What are the three different flow control devices?
Laminar, tapered, rebound
What are the two types of shock strut bearings?
Upper and lower
What does the upper bearing do?
Keep the inner cylinder aligned to the outer cylinder
What is the job of the lower bearing?
It keeps the inner cylinder aligned inside the outer cylinder
Where are the main landing gear spare seals kept?
In the spare seal cavities
What happens if there is too much oil in the shock strut?
It becomes very hard on landing
What happens if there is too much gas in the shock strut?
It becomes too soft on landing
What direction does the body gear turn?
Opposite to the nose gear
Why are body landing gear used?
To improve the turning radius and prevent scrubbing
Why are centre landing gear used?
To increase the aircrafts foot print
Why is a shortening mechanism used on landing gear?
To reduce the length of the landing gear to get it in the bay
What direction does the nose landing gear retract?
Forward
What is used to lock the nose landing gear down?
The drag strut
What is in place to stop the gear folding in if the lock stay fails?
Two large springs
What are the two centring cams used for in the nose landing gear?
To make sure the nose gear is straight and forward during retraction
Why are towing lugs designed to shear at certain loads?
To prevent damage to the leg
On average how many flights can a tire be used for?
150
How much weight can one wheel normally take?
25,000kg
What is a wheel normally made from?
Aluminium alloy
Why drives the brake discs?
Steel drive keys
What is the job of the fusible plug?
To deflate the tyre when it reaches a overheat
How are tyres classified?
By speed rating
What is meant by speed rating?
The maximum speed of a tyre
How are tyres measured?
Section width, rim diameter, outside diameter
How many times can a tyre be retreaded before being screapped?
About ten times
What does a red dot on a tyre indicate?
It’s the lightest part of the tyre
What colour are vent holes on tyres?
Green or yellow
What is hydroplaning?
When the runway is wet causing the tyre to lift off the surface
If a tyre is over inflated what will wear away first?
The centre
If a tyre is under inflated what will wear away first?
The edges
How are tyre bulges caused?
Overheating in the thread area
Why are carbon breaks used over steel?
Lighter, less wear rate, higher temperatures
