747-400 AMM 飞机维护手册 安定门 STABILIZERS(15)

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 B.  The removable leading edge assembly consists of skin attached to ribs. The HF communications antenna is attached to one section of the leading edge.
 C.  The forward torque box is composed of an auxiliary spar and air load ribs extending from auxiliary to front spar. The auxiliary spar is constructed from a central web attached to chords and strengthened by stiffeners. Airload ribs and spars are attached to upper and lower panels. The forward torque box is sealed to the fuselage by mechanical seals.
 D.  The aft torque box is composed of a front spar, stiffened ribs extending from front to rear spar, a rear spar and skin panels. Front and rear spars are constructed of central webs attached to chords and strengthened by stiffeners. The torque box is strengthened by ribs attached to skin-stringer panels.
 E.  The fixed trailing edge, cantilevered from the fin rear spar, is comprised of ribs, beams, and skin panels. The ribs, which extend from fin rear spar to the left and right trailing edge beams, are of two types, standard ribs and hinged ribs. Standard ribs are composed of a stiffened web attached to chords and angles. Hinge ribs, constructed similar to standard ribs, incorporate hinge lugs for attachment of the upper and lower rudders. The triangular shaped beams, composed of chords, stiffeners, webs, and skin, form a closure for the leading edge of the rudders. An aerodynamic/environmental seal extends aft from each beam to the rudder surface.
 F.  A removable tip assembly is attached to the top of the fin. The tip assembly is comprised of a forward and aft fairing and center section. The tip provides aerodynamic fairing and a closure for the VOR antenna.
 G.  The dorsal fin, attached to the fuselage below the leading edge, is constructed of skin and ribs. Two seals, one around the dorsal fin lower periphery and one between dorsal fin and leading edge, provide environmental protection and aerodynamic fairing.
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747-400
MAINTENANCE MANUAL

REMOVABLE FIN TIP 
FIXED TRAILING EDGE SKIN PANELS 
SEAL REMOVABLE PANEL UPPER RUDDER (REF) (EXAMPLE LEFT SIDE) 
LEADING EDGE REMOVABLE  (BOTH SIDES) REMOVABLE PANEL 
AUXILIARY SPAR  REAR SPAR EDGE BEAM FIXED TRAILING 
LOWER RUDDER (REF) 
(BOTH SIDES) REMOVABLE PANEL
LEADING EDGE REMOVABLE  DORSAL FIN REMOVABLE BOX SKIN PANELS FORWARD TORQUE (LEFT SIDE) REMOVABLE PANEL SKIN PANELS AFT TORQUE BOX INTERNAL ACCESS OPENINGS (EXAMPLE) STIFFENERS  FRONT SPAR 
Vertical Stabilizer (Fin) Figure 1 

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747-400
MAINTENANCE MANUAL

 H.  On some airplanes, the dorsal fin, attached to the fuselage below the leading edge, is constructed of fiberglass/honeycomb sandwich panel and ribs. Two seals, one around the dorsal fin lower periphery and and one between the dorsal fin and the leading edge, provide environmental protection and aerodynamic fairing.
 3.  Access Doors and Openings (Fig. 2)
_________________________
 A.  Access doors and openings are provided in the fin 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 body fin deck opening has a fin access cover (Fig. 2). The cover is held in place by four mount bolts that have lockwires and a retaining lanyard.
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747-400
MAINTENANCE MANUAL

 

　
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