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 1.  General_______
 A.  Each outboard wing has two trailing edge flaps to provide additional lift during takeoff and landing. Each trailing edge flap consists of a foreflap, a midflap, and an aftflap.
 2.  Inboard Flaps (Fig. 1)_____________
 A.  The inboard flaps occupy the portion of the wing trailing edge between WBL 129.30 and 445.00.
 B.  The fore flap structure consists of spanwise front and rear spars, inspar ribs, a leading edge section, and a trailing edge section. The front spar upper chords are extruded aluminum angles and the lower chords are aluminum angles. The web consists of two layers of aluminum sheet. The rear spar is a formed channel of aluminum sheet material. The inspar ribs have extruded aluminum angle upper chords, extruded aluminum angle lower chords, and aluminum sheet webs. The nose ribs consist of formed chords and webs fabricated from aluminum sheet.
 C.  The foreflap inspar skin panels are of aluminum honeycomb construction and the nose and trailing edge skins are fabricated from laminated fiberglass honeycomb material. Abrasion-resistant finish is applied to the upper surface of the foreflap and lower surface of the trailing edge panel to provide chafing protection. A phenolic rub strip is installed on the lower trailing edge surface of the fore flap skin to provide chafing protection from the mid flap.
 D.  The midflap structure consists of three spanwise spars (forward, mid, and aft), chordwise inspar ribs, a nose section, and a trailing edge section. The spars have extruded T-chords and utilize aluminum alloy for the upper chords and aluminum material for the lower chords. The spar webs are fabricated from two layers of aluminum sheet. The inspar rib chords and webs are fabricated from aluminum. The nose ribs have extruded aluminum upper and lower chords and aluminum sheet webs. Support tracks are attached to the midflap inspar structure and extend forward of the nose section to support the foreflap. The tracks are machined from steel forgings. At wing buttock lines 246.30 and 340.70, flap actuator support fittings are installed. These fittings, machined aluminum forgings, are attached to the mid spar and front spar and are cantilevered forward of the leading edge to accommodate the flap actuator attachment.
 E.  The mid flap skins are of fiberglass honeycomb construction with the exception of trailing edge lower skin which is fabricated from aluminum sheet. An abrasion-resistant finish is applied to the upper surface of the mid flap to provide protection from chafing with the fore flap. The lower aft portion of the upper midflap skin contains a phenolic rub strip bonded to the surface to provide chafing protection from the aftflap.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
A SEE A A SEE B
FORE FLAP
MID FLAP AFT FLAP
FWD MID FLAP
(FLAPS EXTENDED) A-A  FLAP TRACK FAIRING 
AFT FLAP 

REAR SPAR FORE FLAP SUPPORT SPARS TRACK FRONT SPAR
(TYP) SUPPORTWBL 129.30
SPINDLE (TYP)
FORE FLAP WBLWBL 445.00
246.30
WBLNOSE SECTION 340.70
NOSE SECTION FRONT SPAR
FLAP ACTUATOR SUPPORTREAR SPAR FITTING (TYP)
INBOARD FLAP
TRAILING
A
EDGE WEDGE
Trailing Edge Flaps Figure 1 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

OUTBOARD FLAP

B

Trailing Edge Flaps
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 F.  The aftflap structural frame utilizes two spanwise spars, inspar ribs, nose ribs, and a trailing edge wedge section. The front spar is a formed channel section and the rear spar is an extruded channel section. Both spars are made of aluminum alloy material. The nose ribs are formed from aluminum sheet. The trailing edge wedge is of fiberglass honeycomb construction. The inspar ribs have extruded aluminum upper chords, aluminum sheet webs, and extruded aluminum lower chords.
　
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