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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 HORIZONTAL STABILIZER - DESCRIPTION AND OPERATION
_________________________________________________
 1.  General (Fig. 1)_______
 A.  The horizontal stabilizer consists of left and right outboard sections attached to a stabilizer center section located in the fuselage. The stabilizer is trimmed by pivoting on two rear spar hinges at the intersections of center and outboard sections. A trim drive mechanism attached by actuator fitting at the front spar of the center section provides for stabilizer movements (Ref 27-41-00). An aerodynamic seal fills the gap between stabilizer outboard sections and fuselage. A blade seal between front and rear spars where the spars pass into the fuselage provides sealing during trimming operation. At the outboard sections a removable leading edge attaches to an auxiliary spar. Between the auxiliary spar and front spar is the forward torque box. The aft torque box is between the front and rear spars. Aft of the rear spar is the fixed trailing edge which contains rib structure to which elevators are attached. A removable tip assembly is attached to the end of the outboard stabilizer section.
 B.  The center section and the aft torque box out to STAB STA 285 are sealed to serve as a fuel tank. The area between STAB STA 510 and 560 on the right side is sealed to serve as the vent surge tank.
 2.  Stabilizer Structure (Fig. 1)____________________
 A.  The aft torque boxes of outboard stabilizer sections are joined by fittings and splice plates to the stabilizer center section to form a continuous main structural beam through the fuselage. The structure forward and aft of front and rear spars has no tie to the center section and exists primarily for aerodynamic purposes. The hinge rib assemblies in the center section, which bear high loads in stabilizer trim movements, are constructed of a web attached to upper and lower chords and splice plates strengthened by stiffeners.
 B.  The removable leading edge assembly consists of machined aluminum formed skin attached to ribs.
 C.  The forward torque box is composed of an auxiliary spar and air load ribs which extend from auxiliary spar to front spar. The auxiliary spar is constructed from a central web attached to upper and lower chords and strengthened by stiffeners. The ribs and spars are attached to upper and lower skin.
 D.  The aft torque box is composed of a front spar, stiffened ribs extending from front to rear spar, a rear spar and skin-stringer panels. The front spar is constructed from a central web attached to upper and lower chords and strengthened by vertical and longitudinal stiffeners. Ribs between front and rear spars are composed of webs attached to upper and lower chords and strengthened by stiffeners. The ribs are attached to upper and lower riveted skin-stringer panels.
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 ALL  ú ú 01 Page 1 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

HORIZONTAL  FIXED  HINGE RIB 
SEE  A  STABILIZER CENTER SECTION  TRAILING EDGE  SEE  B  TANK END RIB  INBOARD 
ELEVATOR  FIXED 
PLATE SKIN SPLICE  TRAILING EDGE 

STIFFENER
REAR AFT TORQUESPAR
BOX SKIN PANEL HINGE RIB
ACCESS
REMOVABLE HOLE
FORWARD FITTING
ACTUATOR  PANEL TORQUE BOX SKIN PANEL
OPEN FRONT
ACCESS  HORIZONTAL STABILIZER
SPAR
HOLE RIB OUTBOARD SECTION AUXILIARY
REMOVABLE (EXAMPLE) SPAR
LEADINGFILLET EDGE
FAIRING  A
BEARING LUG
SPLICE FITTING ELEVATOR FRONT SPAR
NOTE:THE INBOARD ELEVATOR IS SHOWN. THE OUTBOARD ELEVATOR SUPPORT STRUCTURE IS ALMOST THE SAME.
HORIZONTAL STABILIZER REAR SPAR HINGE RIB
B
Horizontal Stabilizer Structure Figure 1
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 55-10-00
 ALL  ú ú 01 Page 2 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
　
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本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 安定門 STABILIZERS(2)