HIGH LIFT CONTROL -SECONDARY MODE FLAP AND SLAT SEQUENCE
General
The sequence of the flap and slat extension and retraction in the secondary mode is almost the same as in the primary mode.
Flap and Slat Positions
In the secondary mode, the flap lever commands the flaps and slats to move to the commanded position. The flap positions are the same as in the primary mode.
The slats extend to the gapped position when the flap lever is at any position except up.
Slat load relief is available in secondary mode. The slats retract to the sealed position when the airspeed is more than 215 knots. Load relief operation is described later.
Flap and Slat Extension and Retraction
During extension, the slats extend to the gapped position before the flaps extend. When the slats are at the gapped position, the flaps extend to the commanded position.
The sequence of the flap and slat retraction is the reverse of the flap and slat extension.
Extension and Retraction Time
The extension time is the same as the retraction time.
It takes 5 minutes and 8 seconds to move the slats and the flaps from the UP position to the 30-unit position. The detailed times are:
*
1 minute and 25 seconds to move the slats from the retracted position to the gapped position
*
3 minutes and 43 seconds to move the flaps from the retracted position to the 30-unit position.
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.
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HIGH LIFT CONTROL -ALTERNATE MODE FLAP AND SLAT SEQUENCE
General
The alternate flaps arm switch sets the alternate mode. The alternate flaps selector controls the direction of the flap and slat movement.
Extension
When the arm switch is set to ARM and the selector is set to EXT, the slats move to the sealed position and the flaps move to the 20 unit position. They move at the same time. It takes 2 minutes and 33 seconds.
A detent holds the selector in the EXT position. If the selector is set to OFF while the flaps and slats move, the movement stops.
Retraction
When the arm switch is set to ARM and the selector is set to RET, the flaps retract first, then the slats. Flap retraction takes 2 minutes and 33 seconds. The slats take 59 seconds. Total flap and slat retraction time is 3 minutes and 32 seconds.
A detent holds the selector in the RET position. If the selector is set to OFF while the flaps and slats move, the movement stops.
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HIGH LIFT CONTROL -INDICATIONS -POSITION DISPLAYS
General
The flap and slat position display is on the EICAS display or the EICAS compacted engine display. There are three different displays for the flaps and slats:
*
Primary
*
Secondary
*
Alternate.
Only one display shows at a time.
Primary Mode Display
The primary mode display shows when both the flaps and slats are in the primary mode. This display shows the position of both the flaps and slats. The display is black when the flaps and slats are fully retracted. When the flaps or slats extend, a white tape fills the display from the top down.
A command bar and detent number show the flap lever position. When you move the flap lever, the flap lever detent number and command bar show. While the flaps and slats move, the command bar and detent number are magenta. When the flaps and slats are in the flap lever commanded position, the command bar and detent number change to green.
The primary mode display goes out of view 10 seconds after the flaps and slats are fully retracted.
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