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SHUTTLE
VALVE
MAIN LANDING
GEAR
ACTUATOR
SHUTTLE
VALVE
TO BRAKE
METERING
VALVE
EXTEND
LINE
RETRACT
LINE
GEAR CONTROL
SOLENOID VALVE
PNEUMATIC
DUMP VALVE
UPLOCK
HOOK
ACTUATOR
NOSE DOWNLOCK
RELEASE ACTUATOR
ACCUMULATOR
BLEED
VALVE
CABIN AIR
FROM BRAKES
ACCUMULATOR
GEAR RETRACT PRESSURE SWITCH
LOW-PRESSURE SWITCH
NORMAL-PRESSURE SWITCH
TO BRAKES
HYDRAULIC
RESERVOIR
Figure 14-6. Landing Gear Schematic—Retraction
14-8 510OM-00
CITATION MUSTANG OPERATING MANUAL
Oleo Strut
The oleo (air-oil) strut is a sealed hydraulic piston
and cylinder that uses compressed nitrogen
to absorb landing and taxiing shocks. It absorbs
shocks between the trailing link (attached to
the wheel) and the trunnion (attached to the aircraft).
On the ground, the oleo struts support the
weight of the aircraft.
Main Gear Actuators
Inboard of (and attached to) each main gear
trunnion is a fluid-driven actuator, which extends
or retracts the main landing gear. The
main gear actuators are normally driven hydraulically
but can be extended pneumatically
for emergency gear extension.
Each main landing gear actuator includes its own
integral mechanical locking system to lock the
actuator in place when it is fully extended,
thereby locking the gear down. Hydraulic retraction
pressure retracts the locking system and permits
gear retraction.
Uplock Assembly
In each wheel well, a spring-loaded mechanical
uplock hook catches the uplock roller on the
gear when it retracts. (During preflight, check
that the rollers rotate.) This locks the gear in the
up position. A switch in the uplock assembly detects
when the trunnion uplock roller is in the
lock (gear is up-and-locked). At the start of
gear extension, a hydraulic uplock-sequencing
valve/actuator unit retracts the uplock hook,
releasing the main landing gear, then passes
hydraulic fluid to the gear actuator. In case of
an emergency gear extension, pressurized nitrogen
gas retracts the uplock hook.
Main Wheel, Tire, and Wheel
Assembly
Each main gear assembly includes a single
wheel with tire and a fluid-actuated multipledisc
brake assembly. Each main wheel has three
fusible plugs that melt to deflate the tire if excessive
temperature is generated by an overheated
brake. Inflate with dry nitrogen to 85 ±
5 psi (586 KPa ± 34 KPa) unloaded. Maximum
tire ground speed is 160 knots.
Squat Switch
A squat switch on the bottom of each trunnion
detects whether or not the aircraft is on
ground/weight-on-wheels (WOW) or in
flight/weight-off-wheels. The squat switch provides
this information to aircraft systems that
use this information (including engine/FADEC,
windshield anti-ice, pressurization, landing
gear control, antiskid braking, power distribution,
and air conditioning). Refer to Chapter
17—“Miscellaneous” for more information
about squat switches.
If the left and right squat switches have different
WOW signal indications for longer than
2 seconds, the amber WOW MISCOMPARE
message appears. This advises that any aircraft
systems relying on WOW signals may be inoperative
or may operate unpredictably.
Main Gear Door and Fairing
Each main landing gear strut has a gear door
mechanically attached to the trunnion assembly
of the gear. When the gear is operated, the
door moves up and down with the gear itself
and is not separate from the gear in its operation.
The door will cover the gear strut but the
tire is partially exposed.
Nose Gear
The nose gear assembly supports the nose section
of the aircraft while on the ground and provides
steering and a linkage for towing. The
nose gear assembly (see Figure 14-2) includes:
• Strut
• Shimmy damper
• Drag brace and downlock
• Uplock assembly
• Gear actuator
• Single wheel and tire assembly
Strut
The nose gear strut includes the trunnion (attached
to pivots and moved by the gear
actuator), the shock strut, and the nosewheel
510OM-00 14-9
CITATION MUSTANG OPERATING MANUAL
fork. The integral oleo (air-oil) shock strut absorbs
landing impact and other shocks. The
lower end of the shock strut attaches to the
nosewheel fork, which holds the nosewheel
assembly.
A folding torque link holds the shock strut cylinder
and nosewheel fork piston together and
　
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