Where is fuselage station No. 137 positioned?

Fuselage station No. 137 is positioned 137 inches aft of the zero or fixed reference line. In aircraft design, a zero reference line is typically used as a baseline for measuring the locations of various components along the length of the fuselage. This reference line is often established at the leading edge of the wing or some other significant point on the aircraft structure.

Stations are measured in either an aft (towards the tail of the aircraft) or forward (towards the nose) direction from this reference line. Thus, station No. 137 indicates a point located 137 inches behind this reference line, which is crucial for maintaining precision in assembly and rigging, ensuring that all components fit correctly in relation to one another as designed.

The other options do not accurately represent the definition of fuselage station No. 137 in relation to the reference line used in aircraft design.