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Landing Gear -1.ppt
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- 2. AIRCRAFT LANDING GEAR Purpose •supports airplane during ground operations • Landing Operation
- 6. LANDING GEAR • RETRACTABLE LANDINGGEAR • NON RETRACTABLE (FIXED) LANDING GEAR
- 7. Retractable Landing Gear •Developed to eliminate as much as possible the drag caused by the exposure of the landing gear to air • Required Emergency System for gear extension
- 9. FIXED LANDING GEAR Generallyattached to structural members of the airplane with bolts, but it is not actually "fixed”because it must absorb stresses; hence the wheels must move up and down while landing or taxiing in order to absorb shocks. The landing gear is often equipped with cowling or fairing to reduce the drag (air resistance) , and such cowling or fairing may be assembled insections.
- 11. Auxiliary landing gear •Nose wheel ,Tail Wheel ,Skids ,Floats etc.. • Use to stabilize the airplane on ground • Not to design to absorb shock or landing load • Steering or directional control devices may emploted
- 12. Auxiliary landing gear–Tail Gear • Free from swivel • Normally connected to rudder control system to control steering • Automatic disengagement • Anti-shimmy damper – prevents oscillation during taxing
- 13. Anti-shimmy Device An antishimmydevice is normally provided to reduce the tendency of the tail wheel to oscillate badly during taxiing and landing. It consists of two friction disks.usually made of different materials,held in contact with each other by a spring. One disk is fixed to the spindle-bearing housing and the other is integral with the upper plate of the disengaging device. When the tail wheel is in any controllable position, the friction between the disks dampens the oscillations of the tail wheel.
- 14. Auxiliary landing gear–Nose Gear • Conventional and commonly use • Smaller than main gear • Shock strut with steering system • Better visibility and stabilization on ground • Tri cycle with tail-skid on large long body aircraft
- 15. Fixed landing geartype • Spring gear –Spring Steel • Spring Oleo shock strut –Piston type + coiled spring • Air - Oil shock strut (air –oleo) - retract or fixed can be used
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- 17. Retractable Landing Gear •Normal Retraction / Extension - Hydraulic - Electric • Alternate Extension - Mechanical - Pneumatic - Electric
- 19. Retractable Landing Gear •Up and Locked • In transit • Down and Locked
- 20. Safety Protection • Preventgear retracting on ground - safety switch - handle - ground lock pins • Prevent gear not down & locked when throttle is retarded below normal power or landing configulations = Warning!
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- 29. The Shock Struts •Self contained hydraulic unit • Absorb and dissipate shock load • Main structure of the landing gear • Air-oil type commonly use
- 31. Shock strut consistof: • The inner cylinder • The outer cylinder • air and oil charging valve • the metering pin or tube • packing gland nut • seals • torque arm
- 34. The Metering Pin •Force through its orifice by its variable shape • Control the rate of the fluid flow as the strut compressed • Heat disscipated • Limit compression stroke by air • Should have sufficient of oil and air
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- 37. Example of LandingGear Servicing Chart
- 38. Nose gear Centering/Locating Cam •Consist of upper and lower lube cam • The cam line up the wheel and axial assemblies in the straight ahead position when lift off
- 39. Others gear components •Torsionlinks • Side & Drag struts or brace • Bogie beam or truck beams • Axial • Positioners • Down locked links
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- 45. HYDRAULIC SCHEMATIC -Gear Selector Valve -SequenceValves -Orifice Check Valve
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- 50. Wing Gear Operations(Example)
- 51. Nose Gear SteeringSystem The Nose wheel Steering wheel connects through a shaft to a steering drum located inside the cockpit control pedestal. The rotation of this drum transmits the steering signal by means of cables and pulleys to the control drum of the differential assembly. Movement of the differential assembly is transmitted by the differential link to the metering valve assembly, where it moves the selector valve to the selected position. Then hydraulic pressure provides the power for turning the nosegear.