S 864-039
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P7 panel:
(a)
7E7, STAB TRIM L S/O VALVE.
(b)
7E20, STAB TRIM R S/O VALVE.
S 864-040
(3)
Put the STAB TRIM NO. 2 and NO. 3 HYD switches on the control stand in the NORM position.
S 714-042
(4)
Operate the horizontal stabilizer and make sure the stabilizer pivot fittings do not bind.
S 944-043
(5)
Remove the service platform and close the service access door, 312AR.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
ELEVATOR - DESCRIPTION AND OPERATION
____________________________________
1. General_______
A. Two elevators, inboard and outboard, are hinged from each of the outboard horizontal stabilizer sections. The elevators consist of front and rear spars with stiffened ribs between spars, hinges, bearing lugs, lug assemblies, actuators, and panels. The ribs are attached to panels between front and rear spars. Aft of the rear spar is a trailing edge. Weights are attached to outboard elevators for balance. Each elevator is actuated up or down by a single power control package (Ref 27-31-00).
2. Elevator Structure (Fig. 1)__________________
A. The elevator front spars are composed of central webs attached to upper and lower chords and strengthened by stiffeners. Hinges are attached to front spar for elevator movements. The elevator leading edge fairs elevator to stabilizers.
B. Elevator ribs extending from front to rear spar are composed of central webs attached to upper and lower caps and strengthened by stiffeners.
C. Elevator rear spars are composed of channel sections.
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55-20-00
ALL ú ú 01 Page 1 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
INBOARD ELEVATOR SEE A
OUTBOARD ELEVATOR
SEE B
OUTBOARD ELEVATORB Elevator Structure Figure 1
INBOARD ELEVATOR (EXAMPLE)
INBOARD ELEVATOR
A
TRAILING EDGE
ALUMINUM REAR SPAR
SPARS AND RIBS
FRONT SPAR
MASS BALANCE
(OUTBOARD ELEVATOR ONLY)
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ALL ú ú 01 Page 2 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
VERTICAL STABILIZER (FIN) - DESCRIPTION AND OPERATION
_____________________________________________________
1. General (Fig. 1)_______
A. The vertical stabilizer (fin) structure is attached to the fuselage at body section 48. A removable dorsal fin (fairing) attaches to the fuselage to fair the fin leading edge to the fuselage. Above the fairing the removable leading edge attaches to the auxiliary spar. Between the auxiliary spar and front spar is the forward torque box. The aft torque box extends from front to rear spars. Aft of the rear spar is the fixed trailing edge which contains rib structure to which rudders are attached. A removable fin tip assembly is attached to top of the fin.
2. Fin Structure (Fig. 1)_____________
A. The primary structure of the fin is the aft torque box which is attached by bolts and attach angles to the fuselage.
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