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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.
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:
Each landing gear symbol will display dash marks when the gear information is
unreliable.
UP UP
GEAR
GX_14_011
NOSE GEAR CAUTION
RIGHT MAIN GEAR CAUTION
GEAR WARNING INDICATION
Indicates that the landing gear position
does not agree with landing gear selector
lever position. It will be accompanied by a
voice advisory and a “GEAR DISAGREE”
caution message.
DN DN
GEAR
––
GEAR
–– ––
GX_14_012
GEAR INVALID DATA
GEAR INVALID INDICATION (DASHES)
Indicates that the landing gear position is
not valid and may, or may not, be accompanied
by a voice advisory and a “GEAR
DISAGREE” caution message.
For Training Purposes Only
Sept 04
14-15
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
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
Gear Warning Horn
The gear warning horn has been designed with a logic circuit that maximizes
protection against a possible gear up landing while minimizing nuisance warnings. On
approach, a gear warning horn will normally sound if any gear is not down and locked.
Various speed, altitude and configuration conditions govern whether or not the normal
gear warning horn is either inhibited, mutable or not mutable. The following tables
detail the general logic behind gear horn operation.
GX_14_013
“TOO LOW GEAR”
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
14-16 For Training Purposes Only
Sept 04
LANDING GEAR HORN WARNING LOGIC
Primary Mode
ANY GEAR NOT
DOWN AND LOCKED
Voice alert:
“GEAR”
RADALT < 500’
RADALT < 1,000’
RADALT < 500’
AND > 400 FPM DESCENT
AND
NOT MUTABLE
GX_14_014
AND
AND SFCL = 30°
EITHER THROTTLE < 25°
AND < 190 Kts (EGPWS)
SERVICEABLE
RADALT
Voice alert:
“TOO LOW GEAR”
(Priority over “GEAR”)
NOT MUTABLE
For Training Purposes Only
Sept 04
14-17
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
LANDING GEAR HORN WARNING LOGIC
Secondary Mode
BELOW
16,500’
ANY GEAR NOT
DOWN AND LOCKED
AND
Voice alert:
“GEAR”
< 165 Kts
< 191 Kts
ANY SPEED
AND - FLAPS = 0°
- BOTH THROTTLES IDLE - NOT MUTABLE
- (ONE THROTTLE IDLE) - MUTABLE
AND
FOR 2 MIN AFTER
TAKEOFF –
INHIBITED
GX_14_015
NO SERVICEABLE
RADALT
BELOW 1,000’
AND - FLAPS > 0°
- BOTH THROTTLES IDLE - NOT MUTABLE
- (ONE THROTTLE IDLE) - MUTABLE
AND - FLAPS COMMANDED TO 30°
- THROTTLES ANY POSITION - NOT MUTABLE
AND - > 400 FPM DESCENT RATE - NOT MUTABLE
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
14-18 For Training Purposes Only
Sept 04
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.
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°
RETRACTION AND EXTENSION SYSTEM
　
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