DIMENSIONS AND AREAS - DESCRIPTION & OPERATION
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 1.  General
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 A.  This chapter provides principal dimensions for the wing, ailerons, flaps, horizontal stabilizer surfaces, vertical stabilizer surfaces, and body. Areas for the wing and tail surfaces, and station diagrams for the body, wing, vertical tail surfaces, and engine nacelle.
 2.  Reference Planes and Lines__________________________(Fig. 1)
 A.  General
 (1)  The airplane is divided into reference planes, designated as stations, waterlines and buttock lines, measured in inches from fixed points of reference. This provides a means of quickly identifying the location of components, the center of gravity and the distribution of the weight.
 B.  Standard Abbreviations and Definitions
 (1)  
Body Abbreviations

 ~.................................................................... | B STA | Body Station. A vertical plane perpendicular to body | | | centerline, located by its distance from point 90 | | | inches forward of nose. | ...................................................................... | BBL | Body Buttock Line. A vertical plane parallel to body | | | vertical centerline plane, BBL 0.00, located by its | | | perpendicular distance from body centerline plane. | ...................................................................... | BWL | Body Waterline. A horizontal plane located by it | | | perpendicular distance from parallel, imaginary plane | | | BWL 0.00, 91 inches below lowest body surface. | ...................................................................... | BRP | Body Reference Plane. Horizontal plane, BWL 199.3, at| | | top surface of floor beams. | 2............….......................................................1

 (2)  
Vertical stabilizer abbreviations

 ~.................................................................... | Fin Sta | Vertical Stabilizer Station. Plane perpendicular to | | | centerline of vertical stabilizer rear spar. Distance| | | is measured from Fin Station 0.00, intersection of | | | leading edge line extension and fin waterline 0.00. | 2............….......................................................1
 ~.................................................................... | Fin WL | Vertical Stabilizer Waterline. Horizontal plane | | | measured parallel to a Body Waterline. Fin Waterline | | | 9.65 is Body Waterline 366.5. | 2............….......................................................1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

FIN WL 396.2
90 FIN WL
9.7 WL
199.8
RUDD STAB STA B STA BRP1/2` 0.0
395 1342.5
5.5
B STA WL
B STA
140 14.8
1463.5

BBL 0
PW4000 SERIES ENGINES
Reference Planes and Lines Figure 1 (Sheet 1)
E49354
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

Reference Planes and Lines
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

WLT STA
136.033
BWL 150 COWL

COWL  THRUST REVERSER
PW4000 SERIES ENGINES (LEFT SIDE)

Reference Planes and Lines
Figure 1 (Sheet 3)

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