Abstract: Landing gear is one of the critical subsystems of an aircraft. The need to design landing gear with minimum weight, minimum volume, high performance, improved life and reduced life cycle cost have posed many challenges to landing gear designers and practitioners. Further it is essential to reduce the landing gear design and development cycle time while meeting all the regulatory and safety requirements. Many technologies have been developed over the years to meet these challenges in design and development of landing gear. This paper presents a perspective on various stages of landing gear design and development, current technology landscape and how these technologies are helping us to meet the challenges involved in the development of landing gear and how they are going to evolve in future. NAME : S. Srinivasa Phani Kumar Branch : MECHANICAL College : SWARNANDHRA COLLEGE OF ENGINEERING & TECHNOLOGY

1. Great ideas need landing
gear as well as wings.
– C. D. Jackson

2. CONTENTS
Introduction
Classifications & types
Parts
Mechanism
Failures
Challenges and technology
Advantages
Conclusion
References

3. INTRODUCTION
To provide:
• Structural support to
the aircraft for ground
operation
• Maneuverability for
ground operation
• Mean to absorb
unusually loads
incurred during landing
and ground operation

4. CLASSIFICATIONS OF LANDING GEAR
SKID TAKE-OFF
TROLLEY
TRACK
SKI AIR CUSION FLOATER

5. Landing Gear Types
 Retractable
 Fixed

6. Main parts:

7. MAIN LANDING GEAR
NOSE LANDING GEAR

8. MECHANISM

9. STRESSES

10. Uplock & Down lock Mechanism

11. WHEEL ARRANGEMENTS OVERVIEW

13. SingleWheel Type

14. TANDEEM & TWIN WHEEL TYPE

15. Twin tandeem wheel type

16. Tires

17. BRAKES
 Brakes principle:- Slowing or
stopping a vehicle or other
moving mechanism by the
absorption or transfer of the
energy of momentum, usually
by means of friction.
 The nose wheel may have or
may not have a brake.
 They hold the aircraft
stationary during engine run-
up and in many cases, steer
the aircraft during taxi.

19. Landing Gear Failures
Most of the accidents are
occurred mainly due to the
• Failure in steering
system.
• Non-uniform loading.
• Failure in opening.
• Over load.
• Non uniform landing.
• Over hammering.

20. Aircushion Landing Gear
• High strength skirt
• Light weight
• Lift more than 8feet
• Lift more cargo,
helicopters, tanks etc.

21. ADVANTAGES
Take off trolley
• High performance
• More accuracy
• Durability
Aircushion
• Land in any type of
surfaces
1. Ice
2. Land
3. Water
• Land in snow & dirt.
• Steer.
• Hover

22. CONCLUSION
Technology
• Steering and actuation mechanism
• Brake system
• Tires
• Materials
• Coating (W-C coating sprayed with HVOF, polyurethane
top coats)
Challenges
• Weight
• Volume
• Performance
• Life

23. references
• Infosys, landing gear design and development.
• Aeroscraft
• Wikipedia.org
• AIRCRAFT SYSTEMS – LECTURE NOTES,
VERSION 2004