Discussion
Match each asymmetric or dynamic case in List I with the structure it typically sizes in List II.
List I
A. Engine failure at low speed
B. Rolling pull-out
C. Heavy landing
D. Transonic buffet
List II
1. The outer wing and aileron attachments
2. The fin and rear fuselage
3. Fatigue life of the wing and tail surfaces
4. The undercarriage and its backup structure
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Each case sizes the structure that carries its particular load. An engine failure at low speed produces the largest asymmetric yawing load, sizing the fin and rear fuselage. A rolling pull-out loads the outer wing and the aileron attachments. A heavy landing sizes the undercarriage and its backup structure. And transonic buffet is a repeated, oscillatory load, so what it governs is fatigue life rather than static strength.
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