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A “GEAR DISAGREE”caution message is posted on the primary page if any of the following conditions occur:
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Any one gear remains in transit for more than 28 seconds, the respective rectangle remains amber.
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The position of at least one gear does not agree with landing gear control lever except during normal transit.
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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:
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Any door indicates not closed for longer than 30 seconds during extension or retraction.
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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.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
LANDING GEAR
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:
message.
GEAR INVALID DATA
Landing Configuration Warning
The “Too low gear”aural warning through Enhanced Ground Proximity Warning System (EGPWS) is heard if:
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Any landing gear is not down and locked.
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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.
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