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The position of each of the three landing gears is pictorially indicated by three symbols on the EICAS
display primary page. The gear up symbol for each gear is “UP” in white letters enclosed by a white
outlined box. The gear in transit symbol for each gear is amber cross hatching enclosed by an amber
outlined box. The gear down symbol for each gear is “DN” in white letters 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 except 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.
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 flaps are retracted and brake temperatures are normal.
During normal extension and retraction, the landing gear will display an amber “GEAR DISAGREE”
message, if the gear does not indicate a locked position within 30 seconds of selection.
A continuous “GEAR” voice warning is sounded in the event a landing is attempted with any of the
landing gears not down and locked and the airplane is below 16,500 feet. For details on the aural
“GEAR” warning refer to page 03−10−25 LANDING CONFIGURATION WARNING.
LANDING GEAR
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
15−10−13
LANDING GEAR POSITION AND WARNING SYSTEM (CONT'D)
The LGECU of the landing gear system monitors all gear functions. Any deviation from the selected
gear configuration or failure of the uplocks or downlocks is annunciated on EICAS in the form of
visual and aural messages. The following are examples of the landing gear indicating that it is not in
its commanded state:
GEAR
UP UP
NOSE GEAR CAUTION
RIGHT MAIN GEAR CAUTION
GEAR WARNING INDICATION
Indicates that landing gear does not agree
with landing gear selector lever position. It
will be accompanied by a voice advisory
and a "GEAR DISAGREE" caution
GEAR message.
DN DN
GF1510_011
Each landing gear symbol will display dash marks when the gear information is unreliable.
GEAR
GEAR INVALID DATA
GEAR INVALID Indication (Dashes)
Indicates that landing gear position is not valid
and may or may not, be accompanied by a voice
advisory and a "GEAR DISAGREE" caution
message.
GF1510_012
Landing Configuration Warning
The “Too low gear” aural warning through Enhanced Ground Proximity Warning System (EGPWS)
is heard if:
· Any landing gear is not down and locked.
· Radio altitude less than 500 feet above ground level and the indicated airspeed less than
190 knots.
"Too Low Gear"
LANDING GEAR
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
15−10−14
LANDING GEAR POSITION AND WARNING SYSTEM (CONT'D)
Gear Warning Horn “MUTED” Switch
A “MUTED” switch is located on the landing gear control panel. It is used to disable the gear
warning horn under certain airplane configurations with both radio altimeters inoperative. The
“MUTED” switch is inoperative with at least one radio altimeter valid.
GF1510_014
HORN
MUTED
The gear warning horn is not mutable under any of the following conditions:
· When activated by flap position.
· Both throttles at idle.
· Radio altimeter(s) valid.
The landing gear warning horn function is restored after it has been muted if any of the following
conditions are met:
· Both throttles are advanced above idle.
· All the landing gears are down and locked.
· Flaps are commanded to 30°.
LANDING GEAR
REV 41, Jul 08, 2004 Flight Crew Operating Manual
　
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