E. Tank end ribs are used between front and rear spar at STAB STA 285 on both left and right sides of the stabilizer, and the area is sealed to serve as a fuel tank. Tank end ribs are used at STAB STA 510 and 560, on the right side of the stabilizer only, and the area is sealed to serve as the vent surge tank.
F. The fixed trailing edge is composed of stiffened ribs, hinge ribs, splice plates, lugs, beams, and skin panels cantilevered from the horizontal stabilizer rear spar. The hinge ribs are constructed from stiffened webs attached to upper and lower chords attached to splice plates which extend from stabilizer rear spar to trailing edge beam. An aerodynamic/ environmental seal extends aft from each trailing edge beam to the elevators.
G. The removable tip assembly is attached to the end of the outboard stabilizer section. The tip is comprised of a forward, mid, and aft fairing. The tip fairings are reinforced with ribs. The tip provides aerodynamic fairing and a closure for the stabilizer outboard section.
H. Safety harness attachment receptacles are provided in the fixed trailing edge panel near the inboard elevator power control package. Receptacles accept Norco Inc. lock assemblies, type IL280-2.
I. On airplanes with logo lights, safety harness attachment receptacles are provided on the horizontal stabilizer upper surface, near the body, forward of the front spar.
3. Access Doors and Openings (Fig. 2)
_________________________
A. Access doors and openings are provided in the horizontal stabilizer interior and exterior structure to facilitate inspection, maintenance, and repair of airplane systems equipment components and internal structure (AMM 06-09-00/201).
B. The horizontal stabilizer crawlway access panel left and right is installed on the horizontal stabilizer hinge rib (Fig. 1). Three stiffeners are riveted to the crawlway access panel and must be removed with the panel. The panel and stiffeners are installed on the rib with bolts and nutplates. The bolts require a standard torque.
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747-400
MAINTENANCE MANUAL
NOTE:THE BOTTOM VIEW OF THE LEFT OUTBOARD STABILIZER SECTION IS SHOWN. THE RIGHT OUTBOARD SECTION IS ALMOST THE SAME.
Horizontal Stabilizer Access Doors and Openings
Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
HORIZONTAL STABILIZER LEADING EDGE - REMOVAL/INSTALLATION
_________________________________________________________
1. General
_______
A. This procedure contains two tasks. The first task is the removal of the leading edge for the horizontal stabilizer. The second task is the installation of the leading edge for the horizontal stabilizer.
B. The leading edge for the horizontal stabilizer has three different parts. You can remove or install each part as one unit. The splice ribs connect the parts together.
TASK 55-10-01-004-001
2. Remove the Leading Edge
_______________________
A. Equipment
(1) Safety Lanyard - 24MIT65B00002
B. References
(1)
24-22-00/201, Manual Control
(2)
IPC 55-10-03 Fig. 1
C. Access
(1) Location Zone
331 Horizontal Stabilizer Leading Edge, Left
341 Horizontal Stabilizer Leading Edge, Right
D. Procedure
S 484-038
WARNING: USE A MAN LIFT TO ATTACH THE SAFETY HARNESS FITTINGS TO THE
_______ RECEPTACLES. MAINTENANCE PERSONS CAN FALL WHICH MAY CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
WARNING: DO NOT WALK ON THE HORIZONTAL STABILIZER WITHOUT A SAFETY
_______ HARNESS. MAINTENANCEE PERSONS CAN FALL WHICH MAY CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Attach the Flight Control Safety Lanyard to the horizontal stabilizer (AMM 20-11-33/201).
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