(2)
Landing gear indicator lights have dual light bulbs with independent power sources to reduce the possibility of indicator lights failing to illuminate as a result of power failure.
(3)
The amber GEAR light illuminates when the gear is in transit, or when the gear position does not agree with the gear lever position. The GEAR light will be off when all gears are down and locked and control lever is down, or all gears are up and locked and control lever is not down.
(4)
The amber DOORS light illuminates when any landing gear door is not completely closed and locked. When all the landing gear doors are completely closed and locked the DOORS light will be off.
(5)
The green NOSE light illuminates when the nose gear is down and locked. When the nose landing gear is not down and locked the NOSE light is off.
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P1-3 PANEL
P3-1 PANEL
A
EICAS MESSAGES
LANDING GEAR POSITION INDICATOR LIGHTS
C
Main Landing Gear - Position and Warning Figure 1
D
G
O
E
O
A
R
NOSE
R
g
Sa
a
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(6)
The green LEFT light illuminates when the left main gear is down and locked. When the left main landing gear is not down and locked the LEFT light is off.
(7)
The green RIGHT light illuminates when the right main gear is down and locked. When the right main landing gear is not down and locked the RIGHT light is off.
B.
EICAS Display (Fig. 1)
_____________
(1) The landing gear indication for EICAS is on the EICAS display on the pilot's center instrument panel P3. The EICAS messages for landing gear position are as follows:
One amber GEAR DISAGREE
One amber GEAR DOORS
One white LDG GEAR MONITOR
One white PSEU BITE
During normal operation system 1 and 2 provide redundant control of EICAS. All amber EICAS messages have time delay varying from 25 to 35 seconds. The white EICAS messages have time delays varying from 2 to 10 second delays.
(2)
The amber GEAR DISAGREE message is displayed on EICAS when the gear is not in selected gear handle position within 25 seconds.
(3)
The amber GEAR DOORS message is displayed on EICAS when any landing gear door is not closed and locked within 35 seconds after moving the gear handle.
(4)
The white LDG GEAR MONITOR or PSEU BITE message appears on EICAS when separate and parallel inputs from systems 1 and 2 to the EICAS computer disagree. LDG GEAR MONITOR message appears when disagreement is indicated with gear commanded down, while PSEU BITE message appears when disagreement is indicated with gear commanded up or door closed inputs do not agree between system 1 and system 2.
(5)
These maintenance level messages help fault isolation for the LDG GEAR MONITOR status level message. Each of the messages are stored in EICAS non-volatile memory (NVM). The messages are as follows:
ú (a) GEAR DISAGREE: System 1 and 2 landing gear indicators disagree in down position.
(b) NOSE GEAR DOWN: System 1 and 2 nose gear down indications disagree.
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(c)
NOSE GEAR LOCKED: System 1 and 2 nose gear locked indications disagree.
(d)
ALL GEAR DOWN: Landing gear system indicates all gear down and locked to the landing configuration warning system when nose gear is up.
(e)
GEAR LEVER: System 1 and 2 gear lever indications disagree.
(f)
L GEAR DOWN: System 1 and 2 left main gear down and locked indications disagree.
(g)
R GEAR DOWN: System 1 and 2 right main gear down and locked indications disagree or alternate extend power pack fails to produce 2200 psi within 30 seconds during alternate extension or on-ground door operation.
(h)
GEAR DOORS: System 1 and 2 gear door indications disagree.
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