2. WHAT IS
LANDING
GEARS?
LANDING GEAR OF AN
AIRCRAFT IS A ARRANGEMENT
WHICH IS USE-
-TO SUPPORT THE WEIGHT OF
THE AIRCRAFT WHILE ON THE
GROUND.
-ABSORB SHOCK
LOADSCAUSED BY TAKE-
OFF,LANDING AND TAXIING.
-ENABLE GROUND
MANOEUVRES.
4. WHAT IS TAIL
DRAGGER
LANDING GEAR?
The main gear are
located forward of
the center of gravity,
causing the tail to
require support from
a third wheel
assembly
5. WHAT IS BICYCLE
LANDING GEAR?
Sailplanes commonly use
tandem gear.
this type of landing gear
has the main gear
and tail gear aligned on
the longitudinal axis of
the aircraft
6. WHAT IS TRICYCLE
LANDING GEAR?
Provides better visibility from
the flight deck,
especially during landing and
ground maneuvering
Allows more forceful
application of the brakes
without
nosing over when braking,
which enables higher
landing speeds
7. PARTS OF A LANDING GEAR
2-SHOCK ABSORBER
3-EXTRACTION AND RETRACTION MECHANISM
5-WHEELS
6-TYRES
1-STRUT
4-BRAKES
8. STRUT AND SHOCK ABSORBER
OLEO STRUT IS MAINLY USED IN MODERN AIRCRAFT.
IT CUSHIONES THE IMPACT OF LANDING WHILE TAXIING.
IF WE GOES THROUGH THE STRUCTURE OF OLEO STRUT A PISTON
AND CYLINDER IS USED WHICH ACT LIKE A DAMPER.
NITROGEN IS FILLED IN CYLINDER WHICH ACT LIKE A SPRING
DURING LANDING AND TAKE OFF.
NITROGEN IS USUALLY USE BECAUSE IT LES LIKELY CAUSES THE
CORROSION.
IT WORKS AS A SHOCK ABSORBER IN AIRCRAFT.
9. EXTRACTION AND RETRACTION
A retractable landing gear is installed whenever a drag
improvement is worthy
The landing gear is held in the up position by mechanical
levers under spring tension, and in the down position by
mechanical keys or over center braces
10. BREAK
Purpose is to convert kinetic energy to heat energy, via friction pads
and dissipate the heat to atmosphere.
Brakes usually fitted just to the main wheels and may be torque
limited.
For large transport aeroplanes the main power source for brakes in
normal and alternate operations is hydraulic.
11. WHEELS AND TYRES
TUBELESS TYRES ARE USED IN AIRCRAFT HAVING FOLLOWING
ADVANTAGE.
7½% weight saving.
10ºC cooler running.
Less danger of deflation by puncture.
Reduced permeability losses.
12. LANDING ON FAILURE OF LANDING GEAR
BELLY LANDING OR GEAR UP LANDING
A BELLY LANDING OR GEAR UP LANDING REFERS TO THE LANDING WHEN
AN AIRCREFT LANDS WITHOUT ITS LANDING GEAR.
BELLY LANDING OR GEAR UP LANDING OCCURS WHEN A MECHANICAL
MALFUNCTION PREVENTS THE PILOT FROM EXTANDING THE LANDING GEAR OR
THE PILOT FORGET TO
EXTEND THE LANDING GEAR.
BELLY LANDING CARRY THE RISK THAT THE AIRCRAFT MAY FLIP OVER OR
CATCH FIRE IF IT LANDS TOO FAST OR TOO HARD.
13. CRASHES IN LANDING
GEAR
ON 21SEP 2005 AN AIRBUS A320-200 EXECUTED AN EMERGENCY LANDING AT LOS ANGELES
INTERNATIONALAIRPORT WHEN THE NOSE LANDING GEAR JAMMED IN AN ABNORMAL
POSITION.
ON 11JULY 1991 NIGERIA FLIGHT 2120 CRASHED SHORTELY AFTER TAKE OFF KILLING ALL
247 PASSENGERS AND 14 CREW MEMBERS.
IN SEP 2007 TWO SEPERATE INCIDENT ON SIMILAR LANDING GEAR OCCURRED WITHIN
4DAYS EACH ON BOMBER DASH8-Q400.
14. FUTURE OF LANDING GEAR
SOME TYPE OF COMPOSITE MATERIAL OR ALLOY CAN BE USED TO REDUCE THE WEIGHT
OF LANDING GEAR.
MOST IMPORTANT CONSIDERATION IS THAT MATERIAL SHOULD BE CORROSIVE RESISTIVE.
EHA TECHNOLOGY IS BEING USED IN THE LANDING GEAR FROM THE 90S.
NOW EMA TECHNOLOGY IS USED IN THE LANDING GEAR AS A BACK UP MODE.
FUTURE OF LANDING GEAR MAY BE BRIGHT AFTER MAKING THE LANDING GEAR ELECTRICAL
AND AUTONOMOUS.
