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Indication (Secondary)
• Landing Gear Down
Indication (Primary)
• Door Indication (Fuselage)
SUBSYSTEM A
SUBSYSTEM B
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
14-12 For Training Purposes Only
Sept 04
LANDING GEAR CONTROL SYSTEM
The landing gear control panel is located on the center pedestal. The landing gear
control handle is located in the center of the control panel and is equipped with a
solenoid lock which prevents inadvertent up selection with the airplane on the ground
(WOW) signal. In the event of a solenoid lock malfunction (in flight), a down-lock
release switch (DN LCK REL) on the landing gear control panel permits up selection
of the handle by overriding the solenoid lock.
LANDING GEAR CONTROL PANEL
The landing gear position indication is removed from EICAS 30 seconds after all
landing gear slats, and flaps indicate up and locked, and other system faults (example:
gear, spoilers, brakes, slat/flap) do not exist.
UP
DN
DN LCK
RELEASE
NOSE STEER LDG GEAR
HORN
BTMS OVHT
WARN RESET
EVENT
ARMED
OFF
RMED
MUTED
GX_14_009
Nosewheel Steering
Switch
ARMED
OFF
• – Circuit is
set up for a command
input on the ground.
• Nosewheel
steering will revert to
the free-caster mode of
operation.
–
Landing Gear Handle
Controls retraction and
extension of the landing
gear by sending the
command signal to the
LGECU.
Horn Muted Switch
Mutes the landing gear
warning horn for certain
airplane configurations.
The “MUTED” white
legend will display when
the switch is selected.
Down Lock Release
(Spring-loaded,
solenoid-activated)
Select and hold in the
down-position to manually
override the control lever
solenoid locking
mechanism.
For Training Purposes Only
Sept 04
14-13
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
LANDING GEAR INDICATION
LANDING GEAR POSITION AND WARNING SYSTEM
The status of the landing gear and landing gear bay doors is determined by the
LGECU using inputs from various proximity sensors. The resulting output is sent to
the EICAS which monitors the condition and position of each system.
The position of each of the three landing gear is pictorially indicated by three symbols
on the EICAS display primary page. The gear up symbol for each gear is the word UP
in white letters, enclosed by a white outlined box. The gear in transit icon for each gear
is amber cross hatching enclosed by an amber outlined box. The gear down symbol for
each gear are the letters DN in white, enclosed by a solid green circle.
A GEAR DISAGREE caution message is posted on the primary page if any of the
following conditions occur:
• Any one gear remains in transit for more than 28 seconds, the respective rectangle
remains amber
• The position of at least one gear does not agree with landing gear control lever
during normal transit
• The landing gear control lever is left in the up position during manual extension.
An amber NOSE DOOR or L-R MAIN GEAR DOOR caution message will be posted
on the primary page if one of the following conditions exist:
• Any door indicates not closed for longer than 30 seconds during extension or
retraction
• Any door indicates not closed for more than one second at any other time
5O
O
3.4
75O
115
81
ART
I
G
N
ND
STAB
789 DN DN DN
OUT
3O
GEAR
–TRIMS–
NL RUDDER NR
AIL
LWD RWD
7.2
NU
Gear Position (Flight Controls)
Pop-Up
Up, down and in transit indication is
displayed on the EICAS primary page.
The pop-up display will be removed
from the primary page (in flight only),
30 seconds after the gear and
slats/flaps indicate up, brake
temperatures are normal and no
malfunctions exist.
The pop-up display will appear with
gear selected down, slat/flap selection,
flight spoilers extended.
GX_14_010
EICAS PAGE
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
14-14 For Training Purposes Only
Sept 04
If any one gear remains in transit for more than 28 seconds, the respective rectangle
remains amber and GEAR DISAGREE is posted on the primary page as a caution. The
gear down, in transit and disagree conditions are displayed as long as the condition
exists. The gear UP display is removed from the primary page 30 seconds after the
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