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The landing gear control panel, located on the copilot side of the center
instrument panel, contains the gear lever, position and warning indicators
and safety features. See Figure 8. Landing gear position and warning lights
on the panel are powered by the Emergency DC bus and may be dimmed
and tested with switches on the cockpit side consoles. The landing gear
warning horn/klaxon is powered by the Essential DC bus.
(1) Landing Gear Lever:
The landing gear lever is selected into either the UP or DOWN
detents on the control panel. To move the lever from one selection to
the other, the lever must first be moved to the left to clear the detent.
Lever movement is mechanically linked to the landing gear hydraulic
selector valve in the nose compartment behind the radome. The
selector valve routes Combined or Utility system pressure to the
extend or retract sides of actuators for the landing gear and doors.
Lever position has no effect on operation of the emergency landing
gear extension system, but the position of the lever is integral to a
correct landing gear position indication.
The transparent wheel shaped handle of the landing gear lever has
two clear bulbs for night illumination and a red bulb for annunciation
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-32-00
Page 15
January 31/02
Revision 6
of disagreement between gear lever position and the selected
position of the landing gear (when gear selected down) or landing
gear doors not closed (when gear selected up). With the gear lever
up, the red light illuminates until all landing gear are up and the gear
doors closed. With the gear lever down, the red light illuminates until
all landing gear are down and locked. The warning light circuits are
configured such that a ground is supplied to the red light, powering
the light, whenever there is a difference between the gear lever
selected position and proximity switches on the landing gear
downlocks (DOWN) or proximity switches on the gear doors (UP).
Agreement between selected and actual position removes the
ground from the circuit.
(2) Ground Safety Lock and LOCK RELEASE Button:
On the ground with weight on the aircraft wheels (nutcracker
switches on both main landing gear compressed), the landing gear
lever is blocked from movement out of the DOWN detent by a
solenoid actuated pin. The pin prevents inadvertent retraction of the
landing gear due to unintentional movement of the landing gear
lever. If the blocking solenoid or nutcracker switches malfunction
during takeoff in the transition to the weight off wheels mode,
preventing movement of the landing gear lever to the UP position,
pressing the LOCK RELEASE button will manually move the
blocking pin clear of the landing gear lever.
(3) Down and Locked Lights:
Three green light modules, one for each landing gear, are installed
above the landing gear lever. Each light is an independent circuit,
illuminating only when the associated gear downlock proximity
switch contact is closed. The green lights do not annunciate landing
gear door uplock engagement, and are also separate from the red
warning light in the landing gear lever handle. Thus, if a landing gear
does not fully extend and engage the downlock switch, a red light
will illuminate in the gear lever handle and the green light associated
with the malfunctioning landing gear will not illuminate, identifying
the malfunctioning gear. However, if a landing gear does not fully
retract (downlock not engaged, but gear door uplock not engaged)
the red light in the landing gear lever handle will illuminate, but none
of the green lights will illuminate.
(4) Gear Warning Horn and HORN SILENCE Switchlight:
If the landing gear are not down and locked during flight conditions
associated with landing, a warning horn (aircraft with SPZ-8000 are
equipped with a horn, aircraft with SPZ-8400 are equipped with a
klaxon) will sound, alerting the crew that the landing gear is not in
the correct position. In some conditions, the gear warning horn may
be silenced by pressing the HORN SILENCE switchlight on the
landing gear control panel to the left of the landing gear lever, or by
pressing either of the HORN SILENCE buttons on the outside of the
power levers. In other conditions, the warning horn can be silenced
only by configuring the aircraft correctly for landing. If the HORN
SILENCE switchlight or buttons have been pressed, the HORN
SILENCE switchlight will illuminate.
OPERATING MANUAL
2A-32-00 PRODUCTION AIRCRAFT SYSTEMS
Page 16
January 31/02
Revision 6
The following conditions will sound the landing gear warning horn:
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