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777 AIRCRAFT MAINTENANCE MANUAL
HIGH LIFT CONTROL -MODE SELECTION
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HIGH LIFT CONTROL -PRIMARY MODE FLAP AND SLAT SEQUENCE
General
The flaps and slats extend and retract in sequence. The extension and retraction sequence is different between the three modes.
Flap and Slat Positions
In the primary mode, the flap lever commands the flaps and slats to move to the commanded position. At flap lever positions UP and 1, the flaps are fully retracted. At flap lever positions 5 through 30, the flap positions are the same as the flap lever positions.
The slats have three positions: up, sealed, and gapped. The slats are at the sealed position when the flap lever is at 1, 5, 15, or 20. The slats are at the gapped position when the flap lever is at 25 or 30.
Flap load relief is available in the primary mode. Load relief operation is described later.
Flap lever detent up is for cruise. Detent 1 is for climb-out and approach. Detents 5, 15, and 20 are the takeoff settings. Detents 25 and 30 are the landing settings.
Flap and Slat Extension and Retraction
During extension from the retracted position, the slats extend to the sealed position while the flaps stay retracted. When the slats are at the sealed position, the flaps begin to extend. When the flaps are at the 20 unit position, the flaps stop moving. The slats then extend to the gapped position. When the slats are in the gapped position, the flaps move to the fully extended position.
The retraction sequence is the reverse of the extension.
Extension and Retraction Time
The extension time is the same as the retraction time.
It takes 54 seconds to move the slats and flaps from the UP position to the 30-unit position. The detailed times are:
*
11 seconds to move the slats from the retracted position to the sealed position
*
24 seconds to move the flaps from the retracted position to the 20-unit position
*
6 seconds to move the slats from the sealed position to the gapped position
*
13 seconds to move the flaps from the 20-unit position to the 30-unit position.
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HIGH LIFT CONTROL -PRIMARY MODE FLAP AND SLAT SEQUENCE
Flap Operation With Slats Drive Shutdown
When the slats fail to move to the commanded position in primary and secondary mode, the FSEUs shutdown the slats drive. With a slats drive shutdown, the flaps continue to operate in primary mode. The flaps move to their commanded position independently of the slat position. If the slats are not at the gapped position when the slats drive shutdown occurs, the flaps cannot move more than the 20-unit position. If the slats are at the gapped position when the slats drive shutdown occurs, the flaps can move more than the 20-unit position.
Training Information Point
CAUTION: YOU MUST WAIT 30 MINUTES AFTER 12 MINUTES OF OPERATION IN THE PRIMARY MODE. THE FLAP NO-BACK BRAKE CAN BECOME TOO HOT.
CAUTION: MAKE SURE THE ADP ACCESS DOOR IS FULLY OPEN OR FULLY CLOSED WHEN YOU MOVE THE TRAILING EDGE FLAPS. THE FLAPS CAN HIT THE DOOR IF IT IS NOT FULLY OPEN OR CLOSED. THIS CAN CAUSE DAMAGE TO EQUIPMENT.
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HIGH LIFT CONTROL -PRIMARY MODE FLAP AND SLAT SEQUENCE
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