Aft Fuselage Closure Length, La
This starts from the end of the constant cross-section barrel of the mid-fuselage up to the tip of the tail cone (Figure 3.49a). It encloses the last few rows of passenger seating, rear exit door, toilet, and – for a pressurized cabin – the aft pressure bulkhead, which is an important component from a structural design perspective (La> Lf).
1.23.5 Midfuselage Constant Cross-Section Length, Lm
This is the constant cross-section midbarrel of the fuselage, where passenger seating and other facilities are accommodated (including windows and emergency exit doors, if required).
1.23.6 Fuselage Height, H
This is the maximum distance of the fuselage from its underside (not from the ground) to the top in the vertical plane (Figure 3.50).
1.23.7 Fuselage Width, W
This is the widest part of the fuselage in the horizontal plane. For a circular crosssection, it is the diameter shown in Figure 3.50.