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Match each load case in List I with the structure that principally reacts it in List II.

List I

A. Cabin pressure

B. Wing bending

C. Fin side load

D. Main gear vertical load

List II

1. Spar caps and wing skins

2. The fuselage shell in hoop and longitudinal tension

3. The rear spar and a reinforced wing-to-body frame

4. Reinforced rear fuselage frames and the shell in torsion

Select the correct match.

  • A.A-3, B-1, C-4, D-2
  • B.A-2, B-1, C-4, D-3
  • C.A-1, B-2, C-4, D-3
  • D.A-2, B-4, C-1, D-3

Answer: B

Tracing each load from where it is applied to where it is finally reacted is the essential habit of airframe layout. Wherever a large concentrated load enters a thin shell, a heavy frame or fitting appears to spread it.

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