NOTE: A vacuum bag over all the lightning diverter strip
____ can be used to apply even pressure.
(g)
After the sealant has cured, check for voids in the bond-line along the lightning diverter strip.
(h)
If voids are found, remove and replace the lightning diverter strip.
D. Examine the electrical resistance of the diverter strips, with a bonding meter.
S 284-011
(1) Make sure that the resistance between each diverter strip and fuselage skin is not more than 0.1 ohm (Ref 20-22-01/601).
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A
747-400
MAINTENANCE MANUAL
ALUMINUM ALLOY
ELECTRICAL BONDING
FIXED TRAILING EDGE
TORQUE BOX
DIVERTER SKIN STRIP
WASHER FIN TIP
DIVERTER STRIP FASTENER A-A
Fin Tip Installation
Figure 401
E85085
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747-400 MAINTENANCE MANUAL
RUDDER - DESCRIPTION AND OPERATION
__________________________________
1. General (Fig. 1)_______
A. The rudder consists of an upper and lower rudder hinged from the vertical stabilizer. The structure consists of front, mid, and rear spars on the upper rudder and front and rear spars only on the lower rudder with ribs extending from front to rear spar on both rudders. The rudder skin is attached to the structure.
B. The upper rudder is powered by three actuators, the lower rudder is powered by two actuators (Ref 27-21-00/001).
2. Rudder Structure (Fig. 1)________________
A. The rudder front spar is constructed of a central web attached to chords and strengthened by stiffeners. Hinges are attached to the centerline of front spar for rudder movements. The rudder leading edge fairs rudder to fin trailing edge.
B. The upper rudder mid spar is constructed of a central web attached to chords and strengthened by stiffeners.
C. Rudder ribs are composed of central webs attached to chords and strengthened by stiffeners. Chords attach to panels extending from front to rear spars.
D. Rudder rear spars are composed of central channels strengthened by splice angles.
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A 747-400 MAINTENANCE MANUAL
BSEE UPPER RUDDER
ASEE LOWER RUDDER RUDDER LOWER (EXAMPLE)
LOWER RUDDER A
MID SPAR RUDDER
(FIN) STABILIZER VERTICAL RIB
EDGE TRAILING
HINGE RIB FRONT SPAR RUDDER SKIN PANEL RUDDER
Figure 1 Rudder Structure UPPER RUDDER B
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1.
2.
3.
4.
5.
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747-400 MAINTENANCE MANUAL
ATTACH FITTINGS - DESCRIPTION AND OPERATION
___________________________________________
General
_______
A. The horizontal stabilizer attach fittings provide pivot points for stabilizer movement. The elevator attaches to the horizontal stabilizer trailing edge. The vertical stabilizer (fin) attaches to the fuselage at section 48. The rudder attaches to the trailing edge of the fin.
Horizontal Stabilizer Attach Fittings (Fig. 1)
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