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FOR SIMULATION USE ONLY ā NOT A TRAINING AID
Pressing the LAMP TEST switch, located on the left console, tests the gear handle
and indicator lights for both cockpits. Normal gear sequence and indications are as
follows:
HANDLE GEAR DOORS GEAR LIGHTS HANDLE LIGHT
UP Up Closed None Off
DOWN Up Opening 2 Red (Mains) Red
DOWN Extending Open 3 Red Red
DOWN Down Closing 3 Green / 2
Red (Mains)
Red
DOWN Down Closed 3 Green Off
Downlock Override Button
The downlock override button, located in the front cockpit only, can be used to
override the downlock solenoid which prevents movement of the landing gear
selector handle when the right weight-on-wheels switch is energized (e.g., aircraft
on ground, or right weight-on-wheels switch failure).
Only the landing gear handle will raise on the ground or when airborne with a
failure of the right weight-on wheels switch.
NORMAL OPERATIONS
The system is hydraulically actuated and electrically sequenced to extend and
retract the landing gear and main gear doors.
Main Gear/Doors
When the landing gear handle is lowered, an electrical signal commands a single
hydraulic actuator to open both inboard gear doors, which subsequently allows the
main gear actuators to unlock and lower the gear.
When the main and nose gear are down and locked, the inboard gear doors close
and lock. Internal locks in the main gear actuators engage to lock the main gear
down.
The process is reversed for gear retraction. A normal gear extension/retraction
sequence takes approximately 6 seconds.
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