The landing gear system (fig. 4-13) consists of
three retractable landing gear assemblies. Each main
landing gear has a conventional air-oil shock strut, a
wheel brake assembly, and a wheel and tire assembly.
The nose landing gear has a conventional air-oil shock
strut, a shimmy damper, and a wheel and tire assembly.
The shock strut is designed to absorb the shock that
would otherwise be transmitted to the airframe during
landing, taxiing, and takeoff. The air-oil strut is used on
all naval aircraft. This type of strut has two telescoping
cylinders filled with hydraulic fluid and compressed air
or nitrogen. Figure 4-14 shows the internal construction
of one type of air-oil shock strut.
The main landing gear is equipped with brakes for
stopping the aircraft and assisting the pilot in steering
the aircraft on the ground.
The nose gear of most aircraft can be steered from
the cockpit. This provides greater ease and safety on the
runway when landing and taking off and on the taxiway
in taxiing.
ARRESTING GEAR
A carrier-type aircraft is equipped with an arresting
hook for stopping the aircraft when it lands on the
carrier. The arresting gear has an extendible hook and
the mechanical, hydraulic, and pneumatic equipment
necessary for hook operation. See figure 4-15. The
arresting hook on most aircraft releases mechanically,
lowers pneumatically, and raises hydraulically.
The hook hinges from the structure under the rear
of the aircraft. A snubber meters hydraulic fluid and
works in conjunction with nitrogen pressure. The
4-12
ACTUATING
CYLINDER
DOWNLOCK
CYLINDER
FROM
COMBINED
SYSTEM
LANDING
GEAR
SELECTOR
VALVE
DOOR AND
DOORLATCH
CYLINDERS
UPLOCK
CYLINDER
DOOR
CYLINDER
DOWNLOCK
CYLINDER
RETRACTING
CYLINDER
MAIN GEAR
TO LEFT
MAIN GEAR
NOSE GEAR
NOTE
TIMER VALVES ARE USED
IN MAIN GEAR SYSTEM TO
CONTROL PROPER SEQUENCE.
Anf0413
Figure 4-13.—Typical landing gear system.
ANf0414
TOWING EYE
TORQUE
ARMS
METERING PIN
INNER
CYLINDER
(PISTON)
AIR VALVE
WHEEL AXLE
ORIFICE PLATE
ORIFICE
OUTER
CYLINDER
Figure 4-14.—Internal construction of a shock strut.
