30 Questions
Why are aircraft manufactured with conventional gear?
To facilitate operations on non-paved runways
What has rendered the tail skid obsolete in aircraft design?
The proliferation of hard surface runways
How is directional control maintained in aircraft equipped with tail wheel landing gear?
By connecting the tail wheel to the rudder pedals
Which type of landing gear has the main gear and tail gear aligned on the longitudinal axis of the aircraft?
Tandem gear
What facilitates the use of very flexible wings in aircraft design?
Placement of the landing gear only under the fuselage
Which type of aircraft commonly uses tandem landing gear?
Sailplanes
What is the purpose of adding fairings or wheel pants to aircraft landing gear?
To reduce parasite drag caused by the landing gear
How do thin cross-section spring steel struts and fairings contribute to landing gear performance?
By raising performance and minimizing parasite drag
What advantage do retractable landing gear offer over fixed landing gear during flight?
Retractable gear do not cause parasite drag while stowed in wheel wells
How is the extension and retraction of most landing gear usually accomplished?
Using hydraulics
What is a common feature of retractable landing gear when fully retracted?
They have close-fitting panels that fair with the aircraft skin
How can pilots use the parasite drag caused by extended landing gear to their advantage?
To slow down the aircraft
What is typically used in some landing gear shock struts to control the flow of fluid between the bottom and top cylinders?
Internal metering tube
Why are shock struts equipped with damping or snubbing devices?
To prevent sharp impacts at the end of the stroke
Where is the valve fitting assembly typically located in a shock strut?
Near the top of the cylinder
What role does the packing gland play in a shock strut?
Sealing the sliding joint between upper and lower telescoping cylinders
What is the purpose of a recoil valve or recoil tube in a shock strut?
To restrict fluid flow and prevent damaging impacts
Why are suitable connections provided on all shock strut upper cylinders?
To allow for filling with hydraulic fluid and inflating with air or nitrogen
What is the primary purpose of the wiper on the shock strut piston?
Preventing dirt, mud, ice, and snow from entering the packing gland
How does regular cleaning of the exposed portion of the strut piston benefit the packing gland?
Decreases the possibility of damage to the packing gland
What is the function of torque links or torque arms in most shock struts?
Keeping the wheels aligned
What is the role of a locating cam assembly on nose gear shock struts?
Keeping the gear aligned
How do torque links help retain the piston in the upper cylinder when the strut is extended?
By connecting the upper and lower cylinders
Why are locating cams important in preventing structural damage to the aircraft?
They ensure proper alignment of the wheel and axle assembly
What is the correct procedure to release all air from a strut with a valve core (AN2687-1)?
Remove the valve core using a valve core removal tool.
What is the correct procedure to release all air from a strut without a valve core (MS28889)?
Rotate the swivel nut sufficiently to allow the air to escape.
What tool should be used to depress the valve core of a strut with AN2687-1 valve core?
Valve core removal tool
In servicing landing gear shock struts, what is illustrated horizontally?
Strut servicing steps
What is needed for aircraft on jacks to achieve full compression of the strut?
Exerciser jack
Which type of valve fitting does not require removal of the valve core for releasing air from the strut?
Strut fitting with no core MS 28889-1
Learn about the use of internal metering tubes and damping devices in aircraft landing gear shock struts to control fluid flow and prevent sharp impacts. Understand how recoil valves and recoil tubes help improve the performance and longevity of the landing gear.
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