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Before energizing the aircraft electrical system,
ensure that the gear handle is in the down position
to prevent inadvertent gear retraction.
In particular, if the squat switches do not agree
(as indicated on the EICAS by an amber WOW
MISCOMPARE message), it is possible to
raise the gear handle, possibly resulting in
gear retraction on the ground.
Circuit Breakers
Circuit breakers provide protection for the
components and wiring of the landing gear
system. Specific components are:
• LH ELE #1
° HYD PUMP 2
° LDG GEAR CTL 2
• LH ELE EMERG
° LDG GEAR MONITOR 2
Gear Position Indicators
One red and three green position indicators
on the landing gear control panel provide
gear position indication. In addition, an aural
PLUNGER
RETRACT
SWITCH
EXTEND
SWITCH
LOCKING
SOLENOID
FWD
Figure 14-8. Landing Gear Handle
Locking Solenoid and
Switches
Figure 14-7. Landing Gear Control Panel
510OM-00 14-11
warning sounds if gear is up when the combination
of throttle position, flap position, and
airspeed indicate landing configuration.
The green NOSE–LH–RH lights on the LDG
GEAR control panel indicate gear down and
locked. As each gear locks down, its respective
green light illuminates.
The red landing gear UNLOCK light indicates
an unsafe gear condition. It illuminates when
the gear handle is moved out of GEAR UP detent
and remains on until all three gear are
down and locked. At retraction, the light illuminates
when the gear handle is moved out of
the down position and remains visible until all
three gear are up and locked.
Normal indication with the gear down is three
green lights visible. With the gear retracted,
all lights extinguish and the red UNLOCK
light extinguishes.
Figure 14-9 shows indicator displays for various
gear positions. Test the landing gear indicator
lights and warning horn by positioning
the rotary TEST knob to LANDING GEAR.
CAS Messages
HYD PRESS LO
The amber HYD PRESS LO message indicates
low hydraulic system pressure. During
extension, if this message appears and gear is
not indicating down and locked within 6 seconds,
refer to the checklist for landing gear
emergency extension. This message also indicates
the need to prepare for emergency
braking. Refer to the “Brakes” section of this
chapter. For more information, refer to
Chapter 13—“Hydraulic System.”
HYD PUMP ON
The amber HYD PUMP ON message indicates
that the hydraulic pump has been operating
for more than a minute. See the Airplane Flight
Manual (AFM) procedure for responding to
this message, and prepare for emergency landing
gear extension. This message also indicates
the need to prepare for emergency braking.
Refer to the “Brakes” section of this chapter.
For more information, refer to Chapter
13—“Hydraulic System.”
Aural Warning
The warning/caution advisory system provides
a landing gear aural warning if one or
more gear are not locked down and either of
the following situations occurs:
• One or both throttles are retarded below
approximately 85% N2 and airspeed is
below 130 KIAS. Pressing the HORN SILENCE–
PUSH button on the gear control
panel (see Figure 14-7) silences this
warning.
• Flaps are extended beyond the TAKE
OFF AND APPROACH setting. In this
situation, the aural warning cannot be silenced
with the HORN SILENCE–
PUSH button.
Aural warning is DC-powered. Circuit protection
for the aural warning system and position
lights is on the right CB panel labeled WARN
LIGHT within the lights grouping.
Rotary TEST Knob
The rotary TEST knob is at the top of the copilot
panel. This knob is used to test the landing
gear and antiskid warning systems.
OPERATION
Preflight
During preflight, inspect the pressure gauge
for the emergency landing gear extension
pneumatic bottle. It is in the nose baggage
compartment, on the right side of the aft wall.
Determine the current temperature, and then
compare the gauge pressure indication to the
pressures listed on the placard next to the
gauge to determine if the pneumatic pressure
is appropriate.
CITATION MUSTANG OPERATING MANUAL
14-12 510OM-00
CITATION MUSTANG OPERATING MANUAL
DOWN AND LOCKED UP AND LOCKED
NOSE GEAR NOT
DOWN AND LOCKED
ONE OR MORE GEAR NOT
UP AND LOCKED
　
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