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retraction takes 18–20 seconds.
Each inboard-retracting main gear uses two hydraulic
actuators (one for uplock release and one
for gear actuation). Three more hydraulic actuators
perform these duties for the forward-retracting
nose gear. An electrically positioned
gear-control valve directs hydraulic pressure
CITATION MUSTANG OPERATING MANUAL
Figure 14-1. Left Main Landing Gear
and Door
Figure 14-2. Nose Landing Gear
and Doors
510OM-00 14-3
CITATION MUSTANG OPERATING MANUAL
for gear extension or retraction. If hydraulic
extension fails, the emergency gear T-handle allows
the landing gear to mechanically release
and free fall. A bottle of compressed nitrogen,
activated by the knob behind the T-handle, provides
pressure to ensure gear extension and
downlock (Figure 14-3).
Main Gear System
Main Gear Extension System
Figure 14-4 displays the landing gear actuation
during gear extension.
Uplocks
The main landing gear struts are mechanically
locked in the retracted position by a springloaded,
hydraulically released uplock hook.
In normal operation, to release a strut from its
uplock, the gear-control solenoid valve routes
fluid to the uplock hook actuator, retracting the
piston into the actuator. When the piston retracts
completely, it pulls the uplock hook
free of the uplock roller, and the gear strut is
unlocked to start extension.
Extension
When the uplock actuator is fully retracted,
fluid passes through the uplock actuator to the
gear-extend side of the gear actuator. Hydraulic
pressure is then applied to the actuators, which
extend until the gear is down- and-locked. To
speed gear extension and improve free-fall capability
of the gear, a regenerative shuttle valve
allows fluid to flow from the retract side of the
actuators to the extend side.
Abnormal Main Gear Extension
System
Two backup gear-extension systems are provided
in addition to normal gear extension:
• The T-handle operates a cable system to
mechanically release the uplock hooks
from the struts. The gear should free-fall
into position, aided by the pilot yawing
the aircraft.
NOTE
It may require an acceleration above
150 KIAS to lock the nose landing
gear into place.
• The round knob behind the T-handle releases
pneumatic pressure (high-pressure
nitrogen) from a bottle in the nose
compartment to pneumatically operate
the uplock actuators and release the uplock
hooks, then extend the gear actuators,
which extend the gear.
Figure 14-5 displays the landing gear actuation
during abnormal/emergency extension. Once
the uplock hooks are released, the pneumatic
pressure is applied to ensure that the gear actuators
properly extend and lock the gear.
Without using the pneumatic gear-extension
system, it is still possible to lock the gear down
by yawing the aircraft to force the gear into position.
However, mechanical release and downlock
should always be followed by the
pneumatic extension procedure to ensure complete
and proper extension of the gear.
Figure 14-3. Emergency Gear Release
Handle (Cover Removed)
14-4 510OM-00
CITATION MUSTANG OPERATING MANUAL
SYSTEM PRESSURE
LEGEND
RETURN
STATIC
NITROGEN
CABIN AIR
P
P
P
CONTROL
MANIFOLD
MAIN LANDING
GEAR
ACTUATOR
NOSE GEAR
UPLOCK
ACTUATOR
UPLOCK
ACTUATOR
ASSEMBLY
EMERGENCY GEAR
EXTENSION HANDLE
NOSEGEAR
ACTUATOR
EMERGENCY
BLOWDOWN
BOTTLE
UPLOCK
ACTUATOR
ASSEMBLY
REGENERATIVE
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 14-4. Landing Gear Schematic—Extension
510OM-00 14-5
CITATION MUSTANG OPERATING MANUAL
SYSTEM PRESSURE
LEGEND
RETURN
STATIC
NITROGEN
CABIN AIR
P
P
P
CONTROL
MANIFOLD
MAIN LANDING
GEAR
ACTUATOR
NOSE GEAR
UPLOCK
ACTUATOR
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Cessna塞斯纳公务机飞行手册(77)
