BS
130.00
Reference Planes and Lines
Figure 201 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
BWL
228.976 BWL
225.267
TRAILING EDGE AT WCP
WBL
0.00
Reference Planes and Lines Figure 201 (Sheet 2)
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A
737-300/400/500MAINTENANCE MANUAL
FS or RS Front Spar or Rear Spar. The principal spanwise transverse member of the wing structure, perpendicular to the wing reference plane.
FSS or RSS Front or Rear Spar Station. A plane that is perpendicular to the wing chord plane and the plane of the front or rear spar.
ISS Inboard Slat Stations. A plane that is perpendicular to the inboard leading edge slats. It is measured from the intersection of
the slat rotation axis and a plane perpendicular to the wing reference plane.
LE STA Leading Edge Station. A plane that is perpendicular to the wing reference plane and the the leading edge. It is measured from the intersection of the leading edge extension and wing buttock line 0.00.
MAC Mean Aerodynamic Chord. A chord of the section of imaginary airfoil on the wing which would have vectors throughout the flight range identical to those of the actual wing.
OSS Outboard Slat Stations. A plane that is perpendicular to the outboard leading edge slats. It is measured from the intersection of
the slat rotation axis and a plane perpendicular to the wing reference plane.
W STA or WS Wing Station. A plane that is perpendicular to the wing reference plane and the plane of the outboard rear spar. It is measured from the intersection of the extended leading edge and the wing buttock line 0.00.
WBL Wing Buttock Line. A plane that is perpendicular to the wing reference plane and parallel to the trace of the fuselage centerline. It is measured from intersection
of the wing reference plane and the body buttock line 0.00.
WRP Wing Reference Plane. The outboard rear spar plane projected inboard.
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A 737-300/400/500MAINTENANCE MANUAL
WCP Wing Chord Plane. A plane through the trailing and leading edges of the wing airfoil.
WTS Wing Tip Station. A plane that is perpendicular to the wing reference plane and the wing buttock line 0.00. It is measured from the intersection of the leading edge and the wing buttock line 0.00.
(c) Vertical Stabilizer
FIN STA Fin Station. A plane that is perpendicular to the centerline of the vertical stabilizer rear spar. It is measured from Fin Station 0.00, the intersection of the leading edge line extension and the fin waterline 0.00.
FIN LE STA Vertical Stabilizer Leading Edge Station. A plane that is perpendicular to the vertical stabilizer leading edge. It is measured from the leading Edge Station 0.00, intersection of the leading edge line extension and the vertical stabilizer waterline 0.00
FIN WL Vertical Stabilizer Waterline. A horizontal plane that is measured parallel to a body waterline. Fin waterline 0.00.
RUD STA Rudder Station. A plane that is perpendicular to the rudder hinge centerline. It is measured from Rudder Station 0.00, the intersection of the rudder hinge centerline and vertical stabilizer waterline 0.00.
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