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PM-126A 3-11
LANDING GEAR EXTENSION/RETRACTION SCHEMATIC
Figure 3-3
GEAR
SELECTOR
VALVE
FREE
FALL
VALVE
DOOR
SELECTOR
VALVE
MAIN
HYDRAULIC
SYSTEM
AUXILIARY
HYDRAULIC
SYSTEM
UP
DN
SOURCE
SELECTOR
VALVE
PULL FOR
GEAR FREE FALL
RETURN
GEAR UP
PRESSURE
MECHANICAL
ELECTRICAL
GEAR DOWN
SOURCE SELECTOR
VALVE
NOSE GEAR
ACTUATOR
NOSE GEAR
UPLOCK
MAIN GEAR ACTUATOR
ACTUATOR
MAIN GEAR
ACTUATOR
INBOARD MAIN GEAR
DOOR ACTUATOR
INBOARD GEAR
DOOR UPLOCK
INBOARD GEAR
DOOR UPLOCK
Pilot’s Manual
3-12 PM-126A
LANDING GEAR POSITION LIGHTS
The landing gear position lights, consisting of three Advisory/DOWN
lights arranged in a triangular pattern, are located on the panel GEAR/
HYD panel. The Advisory portion of each light is white in color with a
black hash background and equipped with dual bulbs. The DOWN
portion of each light is green in color and is also equipped with dual
bulbs.
The location of each light in the triangular arrangement corresponds to
the location of the gear on the aircraft. A white/hash (advisory) indication
signifies that the corresponding gear position does not agree with
the position of the Landing Gear Control switch, or that the inboard
door is not up and locked. A DOWN (green) indication signifies the
corresponding gear is down and locked.
During the gear retraction sequence, the three Advisory lights will illuminate
when the sequence is initiated, remain illuminated throughout
the retraction cycle, and then extinguish when the nose gear is up and
locked, and the main gear inboard doors close.
During the gear extension sequence, the three Advisory lights will illuminate
when the sequence is initiated, remain illuminated throughout
the extension cycle, and then extinguish when the nose gear is down
and locked and the main gear inboard doors close.
The lights are operated by the same switches that control the landing
gear extension and retraction cycles. The lights are dimmed when the
navigation lights are on, and may be tested at any time by setting the
SYSTEM TEST switch to the GEAR position and depressing.
The landing gear position indicator lights operate on 5-vdc provided by
the lighting control unit. The position indicator lights are powered by
the EMER BATT. In the event of a complete dc electrical failure, the
landing gear position lights will be powered by the emergency power
system when the EMER BATT switch is in the ON position.
Pilot’s Manual
PM-126A 3-13
LANDING GEAR WARNING SYSTEM
Landing gear indications are installed to alert the operator of potentially
unsafe flight conditions with the landing gear retracted or in transition.
The system provides outputs to the CAS and CWP which activate
aural and visual annunciation during such conditions. Depending
upon the flight condition encountered, a distinct warning or caution
will be indicated.
Gear Warning Indications
• Master Warning Light Illuminated
• Aural Warning Master Warning Tone and Voice Message,
“GEAR . . . GEAR . . . GEAR”.
• GEAR red CWP
• GEAR red CAS
The aforementioned warning indications will be activated by either of
the following conditions:
• One or more landing gear are not down and locked, and flaps
lowered beyond 25°.
• One or more landing gear are not down and locked, both thrust
levers are set less than MCR, and radio altimeter (valid) is less
than 500 feet.
The “GEAR” warning function cannot be muted.
Gear Caution Indications
• Master Caution Light Illuminated
• Aural Caution Master Caution Tone and Voice Message,
“GEAR . . . GEAR . . . GEAR”.
• GEAR amber CAS
The aforementioned caution indications will be activated by either of
the following conditions:
• One or more landing gear are not down and locked, both thrust
levers are set less than 70%, airspeed is below approximately
170 KIAS, altitude is below approximately 14,500 feet, and radio
altimeter is invalid.
• One or more landing gear are in transition, or either main gear
door is not up and locked, and airspeed is 210 KIAS or above.
The “GEAR” caution function can be muted by depressing either the
Master Caution light on the glareshield or the Mute switch on the right
thrust lever handle.
Pilot’s Manual
3-14 PM-126A
The following CAS illuminations are specific to the landing gear warning
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