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 A.  The aft pressure bulkhead for fuselage pressure envelope is at station 2360. This dome-shaped bulkhead is composed of pie-section webs spliced together and strengthened at the splices by radial stiffeners. The vertical fin front and rear spar attach bulkheads are at stations 2412 and 2517 respectively. Station 2598 bulkhead supports the horizontal stabilizer hinge fittings. The bulkhead at station 2658 is composed of titanium webs and chords, and provides an effective firewall between the APU and the rest of the airplane. The webs in all the section 48 bulkheads have numerous cutouts to provide openings for the routing of lines to the APU and other equipment.
Stringers
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 A.  Stringers in section 48 extend from station 2360 pressure bulkhead aft to station 2658. The stringers are formed hat-sections. Attachment to the skin is with shear head rivets and to the frame with formed channel clips.
Frames
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 A.  The frames are Z-shaped members of 7075 aluminum alloy and extend aft of station 2658. Bulkheads completely replace frames as circumferential structural members in the tail section forward of station 2658.
Door Opening Reinforcements
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 A.  The openings around the two access doors and the APU door are reinforced primarily by the addition of stringers and frames. Skin assemblies surrounding these openings are of fail-safe metal-bond construction.
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 ALL  ú ú 01 Page 1 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

HORIZONTAL
RELIEF DOOR
APU
EXHAUST
PANELS

Tail Section, Section 48
Figure 1

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 ALL  ú ú 01 Page 2 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 6.  Doors and Openings
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 A.  Access to section 48 interior is through three doors in the bottom of the fuselage. The forward door provides access to the stabilizer jackscrew and other equipment in the area. The door just forward of the APU access doors provides entrance to the APU battery (Ref 52-49-04 and 52-49-05). Beneath the APU is a clamshell type door with two halves opening outwards that provide access to the APU (Ref 52-48-02).
 B.  The tail section aft of station 2658 has various doors and openings to support operation of the APU. An APU air inlet door is on the right side of the tail section and opens to permit operation of the APU or closes when the unit is shut off (Ref 49-15-00). An opening on the left side of the tail section permits APU cooling air to be exhausted overboard. On each side of the tail section is a spring-loaded pressure relief door that will open when excessive internal pressure develops. When the internal pressure diminishes, the doors will close. A louvered opening in the left pressure relief door and a screened opening in the left APU door vents the APU compartment to the atmosphere at all times. The APU exhaust is ejected through the exhaust shroud in the tail cone fairing.
 C.  Stabilizer seal doors enclose a portion of the stabilizer cut out above and below the stabilizer center section. The seal door is constructed of glass fabric reinforced plastics and attaches to the stabilizer cut out fairing with two hinges. The other attach point on the door attaches to a link of the control mechanism that maintains the position of the seal door during movement of the stabilizer.
 7.  Fairings
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 A.  The stabilizer body seal fairing is riveted to the fuselage skin aft of the stabilizer cutout. The fairing streamlines the area and provides a surface for the seals that are attached to the stabilizer to contact, and rub against, during movement of the stabilizer. The fairing is constructed of glass fabric reinforced plastics.
 B.  The stabilizer cutout fairing attaches to the longeron and frames that surround the stabilizer cutout area and provides structure to support the stabilizer seal doors and the seal track. A fabric-covered silicone rubber bulb-type seal is attached to the inboard side of the fairing and contacts the stabilizer seal door.
　
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