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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"
Gear Warning
The gear warning has been designed with a logic circuit that maximizes protection against a
possible gear up landing while minmizing nuisance warnings. On approach, a gear warning 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 is either inhibited, mutable or not
mutable. The following tables detail the general logic behind gear warning operation.
LANDING GEAR
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
15−10−14
LANDING GEAR POSITION AND WARNING SYSTEM (CONT'D)
Landing Gear Warning Logic
Primary Mode
< 1,000’
ANY GEAR NOT
DOWN AND LOCKED
SERVICEABLE
RADALT
AND
AND > 400 FPM DESCENT
EITHER THROTTLE < 25°
AND SFCL = 30°
AND
AND <190 Kts (EGPWS)
VOICE ALERT
"GEAR"
GF1510_037
NOT MUTABLE
VOICE ALERT
"TOO LOW GEAR"
NOT MUTABLE
(PRIORITY OVER
"GEAR")
RADALT
RADALT< 500’
RADALT< 500’
LANDING GEAR
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
15−10−15
LANDING GEAR POSITION AND WARNING SYSTEM (CONT'D)
Landing Gear Warning Logic (Cont’d)
Secondary Mode
BELOW
16,500’
< 191 Kts
< 165 Kts
ANY SPEED
BELOW 1,000’
ANY GEAR NOT
DOWN AND LOCKED
NO SERVICEABLE
RADALT
AND AND
−FLAPS = 0°
− BOTH THROTTLES IDLE − NOT MUTABLE
− (ONE THROTTLE IDLE) − MUTABLE
AND
−FLAPS > 0°
− BOTH THROTTLES IDLE − NOT MUTABLE
− (ONE THROTTLE IDLE) − MUTABLE
AND
− FLAPS COMMANDED TO 30°
− THROTTLES ANY POSITION
AND
VOICE ALERT
"GEAR"
GF1510_038
>400 FPM DESCENT RATE
− NOT MUTABLE
AND
FOR 2 MIN
AFTER
TAKEOFF−
INHIBITED
− NOT MUTABLE
LANDING GEAR
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
15−10−16
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 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
15−10−17
RETRACTION AND EXTENSION SYSTEM
Normal retraction and extension of the landing gear is initiated by landing gear control lever
selection. The retraction or extension signal is sent to the LGECU which monitors various landing
gear proximity sensing inputs and weightonwheels
(WOW) inputs. If the correct parameters are
met, the LGECU sequentially energizes the appropriate selector valves to retract or extend the
landing gear using No. 2 and No. 3 hydraulic system pressures.
Landing Gear Retraction
For landing gear retraction, once the airplane is airborne (example: weightoffwheels,
nose wheel
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