~.................................................................... | Fin LE Sta | Vertical Stabilizer Leading Edge Station. Plane | | | perpendicular to vertical stabilizer leading edge, | | | measured from fin leading edge station 0.00, | | | intersection of leading edge line extension and | | | vertical stabilizer waterline 0.00. | 2............….......................................................1 ~.................................................................... | Rud Sta | Rudder Station. Plane perpendicular to rudder hinge | | | centerline, measured from Rudder Station 0.00, | | | intersection of rudder hinge centerline and vertical | | | stabilizer waterline 0.00. | 2............….......................................................1
 (3) Horizontal stabilizer abbreviations
 ~.................................................................... | Stab Sta | Horizontal Stabilizer Station. Plane perpendicular to| | | stabilizer chord plane and plane of stabilizer rear | | | spar, measured from stabilizer station 0.00, | | | intersection of leading edge and stabilizer buttock | | | line 0.00. | ...................................................................... | SCP | Stabilizer Chord Plane. Plane through trailing and | | | leading edges of stabilizer airfoil. | ...................................................................... | Stab BL | Horizontal Stabilizer Buttock Line. Plane | | | perpendicular to stabilizer chord plane and parallel | | | to trace of body centerline. It is measured from | | | stabilizer Buttock Line 0.00, intersection of | | | stabilizer chord plane and body buttock line 0.00. | ...................................................................... | Stab RS | Horizontal Stabilizer Rear Spar. A principal spanwise| | | transverse member of stabilizer structure. | ...................................................................... | Stab LE Sta| Horizontal Stabilizer Leading Edge Station. Plane | | | perpendicular to horizontal stabilizer leading edge, | | | measured from Stabilizer Leading Edge Station 0.00, | | | intersection of leading edge line extension and | | | stabilizer buttock line 0.00. | ...................................................................... | Elev Sta | Elevator Station. Plane perpendicular to elevator | | | hinge centerline measured from intersection of | | | elevator hinge centerline and sta bilizer buttock lin | | | 0.00. | 2............….......................................................1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (4) Wing abbreviations
 ~.................................................................... | MAC | Mean Aerodynamic Chord. Chord of section of imaginary| | | airfoil on wing which would have vectors throughout | | | flight range identical to those of actual wing. | ...................................................................... | WRP | Wing Reference Plane. | ......................................................................
 | W Sta  | Wing Station.  Plane perpendicular to wing reference  |
 |  | plane and outboard rear spar extended inboard,  |
 |  | measured from intersection of extended leading edge  |
 |  | and wing buttock line 0.00.  |

 ...................................................................... | WBL | Wing Buttock Line. Plane perpendicular to wing | | | reference plane and parallel to trace of body | | | centerline. It is measured from intersection of win | | | reference plane and body buttock line 0.00. | ...................................................................... | FS or RS | Wing Front Spar or Rear Spar. Principal spanwise | | | transverse member of wing structure. | ...................................................................... | FSS or RSS | Front or Rear Spar Station. Plane perpendicular to | | | wing reference plane and plane of front or rear spar | | | (Rear spar station is same as wing station). | 2............….......................................................1
 (5) Nacelle abbreviations
 ~.................................................................... | Nac BL | Nacelle Buttock Line. Nacelle Buttock Line 0.0 for | | | inboard engines is 2 degrees inboard from Wing Buttock| | | Line 470.0. Nacelle Buttock Line 0.0 for the outboard| | | engines is 2 degrees inboard from Wing Buttock Line | | | 834.0. | ...................................................................... | Nac WL | Nacelle Waterline. A plane which is parellel to the | | | wing reference plane. The Nac WL 38 inches down from | | | wing reference plane at nacelle station 100 is | | | Nacelle WL 100. | ...................................................................... | Nac Sta | Nacelle Station. A vertical plane perpendicular to | | | the nacelle centerline, with nacelle station zero | | | located 197.50 inches forward of the forward engine | | | mount. | 2............….......................................................1
　
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