this presentation is about the Aircraft landing gear configuration and tyre pressure

1. AIRFIELD PAVEMENTS
Aircraft landing
gear configuration
and Tyre pressure
Bhavya S. Jaiswal
Btech civil, Mtech Transportation
Engineering

2. 3. AIRCRAFT LANDING GEAR CONFIGURATION
AND TYRE PRESSURE
• Landing gears are designed to support the aircraft while
grounded and to withstand high loads during landing without
any damage to its structure while providing comfort to the
passengers.
• It is used to absorb the landing impact energy so as to
minimize the loads transmitted to the airframe.
 Aircraft landing gear :
Prepared by: Bhavya S. Jaiswal

3. CONT’D…
• Since the landing gear bears heavy load during working, an
accurate prediction for the load, especially for the dynamically
changing landing impact load, is required to ensure that the
designed landing gear is capable of withstanding the landing
impact energy. Meanwhile, in consideration of airplane mobility
and low energy consumption, lightweight design is also important.
• After takeoff, the landing gear is retracted into the fuselage or
wings and out of the airstream. This is important because
extended gear create significant parasite drag which reduces
performance.
Prepared by: Bhavya S. Jaiswal

4.  COMPONENTS OF LANDING GEAR
• Displacement sensor
• pressure sensor
• Accelerometer
• Temperature sensor
• Strain gauge
• Embedded flight control
system
• Shock absorber
• Wheel
• Brake system
• Turning system
• Undercarriage retractile
system
Prepared by: Bhavya S. Jaiswal

5. LANDING GEAR
Prepared by: Bhavya S. Jaiswal

6. DIFFERENT TYPES OF LANDING GEAR USED FOR
VARIOUS AIRCRAFT
• Skids type : helicopters, Balloon gondolas, and tail dragger aircraft
• Skis type : where aircraft used to takeoff or land in frozen lakes and
snowy areas.
• pontoon type : If the operational surface of aircraft is water
Prepared by: Bhavya S. Jaiswal

7. SKIDS TYPE : HELICOPTERS, BALLOON
GONDOLAS, AND TAIL DRAGGER AIRCRAFT
Prepared by: Bhavya S. Jaiswal

8. SKIS TYPE : WHERE AIRCRAFT USED TO TAKEOFF
OR LAND IN FROZEN LAKES AND SNOWY AREAS
Prepared by: Bhavya S. Jaiswal

9. PONTOON TYPE : IF THE OPERATIONAL SURFACE
OF AIRCRAFT IS WATER
Prepared by: Bhavya S. Jaiswal

10. • An aircraft tire or Tyre is designed to withstand extremely
heavy loads for short durations.
• The number of tires required for aircraft increases with the
weight of the aircraft, as the weight of the airplane needs to be
distributed more evenly. Aircraft tire tread patterns are
designed to facilitate stability in high crosswind conditions, to
channel water away to prevent hydroplaning, and for braking
effect.
• Research has shown that transport-category airplanes can lose
as much as five percent of tire pressure per day under typical
operations. At a pressure rate loss of five percent per day, it
would only take a few days before they require servicing.
 Tyre pressure
Prepared by: Bhavya S. Jaiswal

11. CONT’D
• Tests of airliner aircraft tires have shown that they are able to
sustain pressures of maximum 800 psi (55 bar; 5,500 kPa) before
bursting. During the tests the tires have to be filled with water, to
prevent the test room being blown apart by the energy that would
be released by a gas when the tire bursts.
• Aircraft tires are usually inflated with nitrogen to minimize
expansion and contraction from extreme changes in ambient
temperature and pressure experienced during flight. Dry nitrogen
expands at the same rate as other dry atmospheric gases (normal
air is about 80% nitrogen), but common compressed air sources
may contain moisture, which increases the expansion rate with
temperature.
Prepared by: Bhavya S. Jaiswal

12. REFERENCES
• Landing gear : Handbook of Materials Failure Analysis with Case
Studies from the Aerospace and Automotive Industries, 2016
• Tyre pressure : code7700
Prepared by: Bhavya S. Jaiswal

13. CONTENT OF THE PRESENTATION
Types of airfield pavements
Component parts of airfield
Aircraft landing gear configuration and Tyre pressure
4. Airfield design methods