757 MAINTENANCE MANUAL
 AUX SPAR STA  Auxiliary Spar Station. These are planes perpendicular to the horizontal stabilizer auxiliary spar. They are measured from Auxiliary Spar Station 0.00, intersection of auxiliary spar extension and stabilizer buttock line 0.00.
 ELEV STA  Elevator Station. These are planes perpendicular to the elevator hinge centerline. They are measured from the intersection of elevator hinge centerline and stabilizer buttock line 0.00.
 FS STA  Front Spar Station. These are planes perpendicular to the horizontal stabilizer front spar. They are measured from Front Spar Station 0.00, intersection of front spar and trace of body buttock line 0.00 at horizontal stabilizer reference plane.
 HSBL  Stabilizer Buttock Line. This is a plane perpendicular to the horizontal stabilizer reference plane and parallel to the trace of the fuselage centerline. It is measured from stabilizer buttock line 0.00, intersection of horizontal stabilizer reference plane and body buttock line 0.00.
 HSRP  Horizontal Stabilizer Reference Plane. This is the datum plane of the horizontal stabilizer. It is inclined 7° up with respect to the BWL plane and passes through the intersection of the BBL 0.00 and BWL 238.015 planes.
 LE STA  Leading Edge Station. This is a plane perpendicular to the horizontal stabilizer leading edge. It is measured from Stabilizer Leading Edge Station 0.00, intersection of leading edge line extension and stabilizer buttock line 0.00.
 RS STA  Rear Spar Station. This is a plane perpendicular to the horizontal stabilizer rear spar. It is measured from Rear Spar Station 0.00, intersection of rear spar and trace of body buttock line 0.00 at horizontal stabilizer reference plane.
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757 
MAINTENANCE MANUAL
 STAB STA  Stabilizer Station. This is a plane
 perpendicular to the stabilizer rear spar and
 the horizontal stabilizer reference plane.
 Stabilizer station 0.00 is at the intersection
 of the leading edge extension, body buttock
 line 0.00 and the horizontal stabilizer
 reference plane.
 (5)  Power Plant
 PPBL  Power Plant Buttock Line. This is a plane
 perpendicular to the wing reference plane. It
 is measured from a parallel plane (PPBL 0.00)
 that intersects the WBL 255.0 plane at the wing
 leading edge and angles 1.5 degrees inboard
 just forward of the wing leading edge.
 PPWL  Power Plant Waterline. This is a plane
 perpendicular to the PPBL datum plane and
 inclined 2.4072 degrees upward from the wing
 reference plane. The PP WL 100.00 (centerline
 of engine) is measured 61.70 inches down from
 the wing leading edge at WBL 255.00.
 PPS or PPSTA  Power Plant Station. This is a plane
 perpendicular to the engine centerline. The
 zero position is located 72.30 inches forward
 of the forward edge of the fan cowl panel.

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757 MAINTENANCE MANUAL
 DIMENSIONS AND AREAS - MAINTENANCE PRACTICES
____________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task gives the primary airplane dimensions. The second task gives the major zones on the airplane.
 TASK 06-00-00-222-001
 2.  Primary Airplane Dimensions (Fig. 201)___________________________
 A.  Procedure
 S 222-006
 (1) Refer to Fig. 201 for the primary dimensions of the airplane.
 TASK 06-00-00-212-004
 3.  Zone System (Fig. 202)___________
 A.  Procedure
　
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