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Landing gear systems
1.
LANDING GEARSYSTEMS
THIS TRAINING MANUAL HAS BEEN PREPARED FOR MAINTENANCE TECHNICIANS AND DOES
NOT SUPERSEEDED INFORMATION CONTAINED IN APPLICABLE AIRCRAFT DOCUMENTS
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Page 1 Aug 2007
2.
LEARNING OBJECTIVEWill have a knowledge and
demonstrate of:
Landing gear system components,
safety warning indication, system
operation and maintenance.
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Page 2 Aug 2007
3.
LANDING GEAR SYSTEMEFFECTIVITY: AIRFRAME POWERPLANT/
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Page 3 Aug 2007
4. LANDING GEAR SYSTEM
Aircraft Landing Gear, consists:• Main Landing Gear.
• Auxiliary Landing Gear.
Where may or may not be retractable.
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Page 4 Aug 2007
5. LANDING GEAR SYSTEM
Main Landing Gear forms the principle support of theaircraft on land or water (include any combination of
wheels, floats, skis, shock-absorbing, brake, retract
mechanism, controls and warnings).
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Page 5 Aug 2007
6. LANDING GEAR SYSTEM
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Page 6 Aug 2007
7. LANDING GEAR SYSTEM
Auxiliary Landing Gear, consists of tail or nose wheel;skids; necessary cowling.
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Page 7 Aug 2007
8. LANDING GEAR SYSTEM
Tricycle landing gear retractable are arrangementwith the Main Gears and Nose Gear.
Main gear consist of two oleo/pneumatic struts with
pair of wheels and brakes.
Nose gear steerable oleo/pneumatic.
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Page 8 Aug 2007
9. LANDING GEAR SYSTEM
Some of aircraft have dual wheels on strut and morethan two wheels referred to as “bogie”.
Retraction and extension by hydraulic with selector
lever in the flight compartment.
Alternate extension can be mechanically, pneumatic
compressor air.
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Page 9 Aug 2007
10. LANDING GEAR SYSTEM
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Page 10 Aug 2007
11. LANDING GEAR SYSTEM
Shock strut contains hydraulicthat support aircraft on the
ground and protect structure
by absorbing shock load.
Consists of two telescopic
cylinder (inner and outer).
Lower chamber always filled
with fluid, the upper chamber
contains compressed air.
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Page 11 Aug 2007
12. LANDING GEAR SYSTEM
Orifice/metering pin betweentwo chamber provides a
passage of fluid during
extension retraction.
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Page 12 Aug 2007
13. LANDING GEAR SYSTEM
Controlling the rate of fluidflow during compression.
Damping or snubbing on some
shock strut equipped to reduce
the rebound during extension
prevent rapidly extension of
shock strut.
Axle on shock strut to provide
for installation of wheels.
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Page 13 Aug 2007
14.
Fluid filler and air valve assembly toprovide of filling the strut with hydraulic
and inflating air.
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Page 14 Aug 2007
15. LANDING GEAR SYSTEM
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Page 15 Aug 2007
16.
Packing glanddesigned to seal
sliding also to
keep sliding
surface free form
dirt would result in
leaks.
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Page 16 Aug 2007
17. LANDING GEAR SYSTEM
Shock struts are equipped withtorque arm/link attached to upper
and lower cylinders to maintain
correct alignment of the wheel.
Nose strut provided with upper
locating cam attached to upper
cylinder and a mating lower
locating cam (centering cam), this
cam lineup to straight of wheel
when strut fully extended;
prevent possible structural
damage.
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Page 17 Aug 2007
18. LANDING GEAR SYSTEM
When strut extends contactingslopping area centering contact
and slides, so aligns and rotates
the nose gear into a straight a
head direction.
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Page 18 Aug 2007
19. LANDING GEAR SYSTEM
Shimmy damper attached on gear struts selfcontained hydraulic to prevent wheel fast leftright/flutter (oscillation) during rolling,accomplished by metering of hydraulic fluid
through small orifice of two chamber.
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Page 19 Aug 2007
20. LANDING GEAR SYSTEM
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Page 20 Aug 2007
21. LANDING GEAR SYSTEM
Shimmy Damper (Nosewheel).
Control vibration or
shimmy through
hydraulic damping
and prevent shimmy
during take-off roll.
• Piston type.
• Vane type.
• Incorporated in the
nose wheel power
steering.
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Page 21 Aug 2007
22. LANDING GEAR SYSTEM
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Page 22 Aug 2007
23. LANDING GEAR SYSTEM
Van type located just above nose wheel fork may bemounted either internally or externally.
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Page 23 Aug 2007
24. LANDING GEAR SYSTEM
Steer damper is hydraulically operated, basicallycontaining rotary van-type (similar to vane-type).
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Page 24 Aug 2007
25. LANDING GEAR SYSTEM
Servicing shock strut:• Jacking the aircraft.
• Release air valve slowly
(ensure the strut
compress).
• Fill the strut with
approved fluid to the level
service.
• Inflate the strut using
nitrogen air pressure.
• Tighten the air valve.
Inspect shock strut for
leakage and proper
extension.
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Page 25 Aug 2007
26. LANDING GEAR SYSTEM
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Page 26 Aug 2007
27. LANDING GEAR SYSTEM
Torque Link-keep the landing gear straight isattached to upper cylinder and lower cylinder of
shock strut.
Links are hinged while the cylinder can move up and
down.
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Page 27 Aug 2007
28. LANDING GEAR SYSTEM
The strut attached to thestructure to enable the strut
swing.
Drag struts are hinged so the
landing gear can be retracted.
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Page 28 Aug 2007
29. LANDING GEAR SYSTEM
An electric gear retraction, using motor convertselectrical energy to rotation.
Control by switch, the motor movement be reverse
while gear to down.
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Page 29 Aug 2007
30. LANDING GEAR SYSTEM
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Page 30 Aug 2007
31. LANDING GEAR SYSTEM
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Page 31 Aug 2007
32. LANDING GEAR SYSTEM
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Page 32 Aug 2007
33. LANDING GEAR SYSTEM
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Page 33 Aug 2007
34. LANDING GEAR SYSTEM
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Page 34 Aug 2007
35. LANDING GEAR SYSTEM
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Page 35 Aug 2007
36. LANDING GEAR SYSTEM
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Page 36 Aug 2007
37. LANDING GEAR SYSTEM
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Page 37 Aug 2007
38. LANDING GEAR SYSTEM
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Page 38 Aug 2007
39. LANDING GEAR SYSTEM
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Page 39 Aug 2007
40. LANDING GEAR SYSTEM
Landing gear safety devices.Prevent collapse the gear when the aircraft is on the
ground.
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Page 40 Aug 2007
41. LANDING GEAR SYSTEM
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Page 41 Aug 2007
42. LANDING GEAR SYSTEM
To provide a visual indication of landing gear position,indicators are installed in flight compartment.
A horn and lights comes on when one or more
throttles retarded and landing gear is other than
down and lock.
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Page 42 Aug 2007
43. LANDING GEAR SYSTEM
NOSEGEAR
NOSE
GEAR
NOSE
GEAR
NOSE
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
L
A
UP
N
D
I
N
G
OFF
G
E
A
R
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Page 43 Aug 2007
44. LANDING GEAR SYSTEM
NOSEGEAR
NOSE
GEAR
NOSE
GEAR
NOSE
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
L
A
UP
N
D
I
N
G
OFF
G
E
A
R
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Page 44 Aug 2007
45. LANDING GEAR SYSTEM
NOSEGEAR
NOSE
GEAR
NOSE
GEAR
NOSE
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
L
A
UP
N
D
I
N
G
OFF
G
E
A
R
EFFECTIVITY: AIRFRAME POWERPLANT/
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Page 45 Aug 2007
46. LANDING GEAR SYSTEM
NOSEGEAR
NOSE
GEAR
NOSE
GEAR
NOSE
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
L
A
UP
N
D
I
N
G
OFF
G
E
A
R
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Page 46 Aug 2007
47. LANDING GEAR SYSTEM
NOSEGEAR
NOSE
NOSE
GEAR
GEAR
NOSE
GEAR
NOSE
GEAR
LEFT
RIGHT
LEFT
RIGHT
GEAR
GEAR
GEAR
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
L
A
UP
N
D
I
N
G
OFF
G
E
A
R
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Page 47 Aug 2007
48. LANDING GEAR SYSTEM
NOSEGEAR
NOSE
NOSE
GEAR
GEAR
NOSE
GEAR
NOSE
GEAR
LEFT
RIGHT
LEFT
RIGHT
GEAR
GEAR
GEAR
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
LEFT
GEAR
RIGHT
GEAR
L
A
UP
N
D
I
N
G
OFF
G
E
A
R
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Page 48 Aug 2007
49. LANDING GEAR SYSTEM
Ground Lock.Prevent collapse the
gear when the aircraft
is on the ground,
additional safety
devices are installed
(ground lock pins)
which have red tape
REMOVE BEFORE
FLIGHT.
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Page 49 Aug 2007
50. LANDING GEAR SYSTEM
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Page 50 Aug 2007
51.
Steering system,provide nose wheel
steering capabilities
through mechanical
linkage to the rudder
pedal.
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Page 51 Aug 2007
52.
LANDING GEAR SYSTEMBrake system used for slowing, stopping, holding or
steering aircraft.
Brakes are installed in each main landing gear wheel,
entire brake system inspected about supply hydraulic
pressure.
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53.
LANDING GEAR SYSTEMThree type brake systems are:
• Independent systems.
• Power control systems.
• Power boost systems.
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54.
LANDING GEAR SYSTEMThree type brake systems are:
• Independent systems.
On small aircraft it has own reservoir and is
independent of the hydraulic system.
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55. LANDING GEAR SYSTEM
Three type brake systems are:• Power control systems.
Used on aircraft requiring a
large volume of fluid to
operate brake.
A check valve traps hydraulic
pressure accumulator which
store fluid pressure and acts
as a surge.
Control valves regulate and
control pressure to actuates
the brakes.
Shuttle valve isolating the
emergency system for the
normal brake system.
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56. LANDING GEAR SYSTEM
A pressure ballcheck power brakecontrol valve.
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57. LANDING GEAR SYSTEM
Sliding spool type power brake control valve.EFFECTIVITY: AIRFRAME POWERPLANT/
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Page 57 Aug 2007
58. LANDING GEAR SYSTEM
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59. LANDING GEAR SYSTEM
Power boost system.Brake the de-booster cylinder
are used with power brake
control valve on aircraft with a
high pressure hydraulic system
and low pressure brakes.
Brake de-booster cylinder
reduce pressure to the brake
and increase the volume of
fluid flow.
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60. LANDING GEAR SYSTEM
Three type brake systems are:• Power boost systems.
Are used on aircraft that land too fast to employ the
independent brake but are too light in weight to
require power brake control valve.
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Page 60 Aug 2007
61. LANDING GEAR SYSTEM
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62. LANDING GEAR SYSTEM
BRAKE ASSEMBLY, common used are:• Single-disk.
• Dual-disk.
• Multiple-disk.
• Segmented rotor or expander tube.
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Page 62 Aug 2007
63. LANDING GEAR SYSTEM
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64. LANDING GEAR SYSTEM
Single-disk and Dual-disk are commonly use on smallaircraft.
Multiple-disk normally used on medium aircraft.
Segmented rotor or expander tube found on heavier
aircraft.
Braking action on Single-disk by applying friction to
both sides of rotating disk.
Dual-disk similar to the single-disk.
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65. LANDING GEAR SYSTEM
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66.
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67. LANDING GEAR SYSTEM
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68. LANDING GEAR SYSTEM
Inspection and Maintenance.Proper fluid level to prevent brake failure or air into
the system, removed by bleeding the system.
Two methods of bleeding brake system:
• From top downward (gravity method)
• Bottom upward (pressure method)
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69. LANDING GEAR SYSTEM
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70. LANDING GEAR SYSTEM
WHEELS.Provide the mounting for tires which absorb shock on
landing, support the aircraft on ground and assist
ground control during taxi, take-off and landing.
Wheels usually made from aluminum or magnesium,
provide strong, light weight; there are:
• Split wheel (most popular)
• Removable type.
• Drop center fixed flange type.
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71. LANDING GEAR SYSTEM
Split typeEFFECTIVITY: AIRFRAME POWERPLANT/
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72. LANDING GEAR SYSTEM
Removable typeEFFECTIVITY: AIRFRAME POWERPLANT/
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Page 72 Aug 2007
73. LANDING GEAR SYSTEM
Fixed flange, dropcenter type
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Page 73 Aug 2007
74. LANDING GEAR SYSTEM
TIRES.Aircraft tires tubeless or tube type, that provide a
cushion of air help absorb the shocks.
Tire construction with a size designation of 26 x 6.6
• 26 inches outside diameter (A).
• 6.6 inches width (B).
• 10 inches rim diameter (C).
A xx B
BR
-C
A
C
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75. LANDING GEAR SYSTEM
Tubeless tire similar totube tire, they have a
rubber inner liner that
mated to the inside
surface of tire for
retain air.
Beaded area is
designed to form a seal
with the wheel flange.
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Page 75 Aug 2007
76. LANDING GEAR SYSTEM
Wear indicators builtinto some tires as an
aid in measuring tread
wear.
These indicators are
holes in the tread area
lands in the bottom of
groove.
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Page 76 Aug 2007
77. LANDING GEAR SYSTEM
Cord body, multiplelayers to provide
flexible and give tire
strength, resist internal
pressure, maintain tire
shape.
Ply rating refer to the
number of cord fabric
plies.
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Page 77 Aug 2007
78. LANDING GEAR SYSTEM
Cord body, multiplelayers to provide
flexible and give tire
strength, resist internal
pressure, maintain tire
shape.
Breakers are one or
more plies of cord to
provide extra reinforce
prevent damage of tire.
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Page 78 Aug 2007
79. LANDING GEAR SYSTEM
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