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TRAILING EDGE FLAPS -OUTBOARD FLAP
Purpose
The outboard flaps increase the lift of the wing during takeoff and climbout. They also increase the lift and drag during approach and landing. They are retracted during cruise.
Physical Description
The outboard flap is made of lightweight composite materials. The skin is reinforced graphite/epoxy bonded to a core of Nomex honeycomb. The dimensions of the outboard flap are approximately 528 inches by 76 inches (13.4 m by 1.9 m). The outboard flap weighs about 616 lb (280 kg).
Location
The outboard flap is between the flaperon and the aileron, along the trailing edge of the wing.
Functional Description
The maximum deflection of the outboard flap is 36 degrees at flap lever position 30.
Training Information Point
There are three hoist points on the outboard flap. A spreader bar is not necessary to lift the flaps.
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777 AIRCRAFT MAINTENANCE MANUAL
TRAILING EDGE FLAPS -OUTBOARD FLAP
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TRAILING EDGE FLAPS -OUTBOARD FLAP SUPPORT FAIRINGS
Purpose
The outboard flap support fairings cover the flap support mechanisms which are below the wing. The fairings supply a streamlined and aerodynamic enclosure.
Physical Description
All the fairings are composite materials. They attach to their support structure by bearing points and by linkages.
Location
The outboard flap has two flap support fairings on each wing. One is inboard and one is outboard.
Functional Description
The inboard and outboard support fairings for the outboard flap each have a forward fairing attached to the wing lower surface and an aft fairing attached to the flap support mechanism. The aft fairings move down during the outboard flap extension to provide the clearance for the flap movement.
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TRAILING EDGE FLAPS -OUTBOARD FLAP SUPPORT FAIRINGS
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TRAILING EDGE FLAPS -FUNCTIONAL DESCRIPTION -PRIMARY MODE CONTROL
General
Only one FSEU commands the flaps in the primary mode.
In the primary mode, the FSEU controls:
*
Flap retraction and extension
*
Flap/slat sequence
*
Cruise inhibit
*
Flap load relief
*
Low-speed control
*
Shutoff control.
For redundancy, both channels in the FSEU must agree on the flap command. Each channel controls switches that are connected in series. Both channels must send the same command to the switches for the FSEU to energize the commanded solenoid.
The two coils in each solenoid of the primary control valve get electrical power from different power sources. Each FSEU controls the ground for one of the coils in each solenoid.
Flap Retraction and Extension
The FSEU compares the flap lever position to the flap position. The flaps retract if the flap lever position is less than the flap position. The flaps extend if the flap lever position is greater than the flap position.
Flap/Slat Sequence
This function controls the sequence of the retraction and extension of the flaps and slats. See the high lift control section for more information about the primary mode flap and slat sequence (SECTION 27-03).
Cruise Inhibit
This function prevents flap extension during cruise. This happens when the airspeed is more than 250 knots or the altitude is above 20,300 feet.
Flap Load Relief
This function commands the flaps to retract if the airspeed increases above the flap load relief limit.
Low-Speed Control
This function reduces the speed of flap movement as the flaps approach the commanded position. The FSEU energizes the low-speed solenoid when the flaps are less than approximately seven torque tube turns from the commanded position.
Shutoff Control
The FSEU energizes the shutoff solenoid valve to open when there is a retract or extend command.
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TRAILING EDGE FLAPS -FUNCTIONAL DESCRIPTION -PRIMARY MODE CONTROL
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777 AIRCRAFT MAINTENANCE MANUAL
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