Discussion
Match each critical case in List I with what it tests in List II.
List I
A. Engine failure after take-off
B. Crosswind landing
C. High angle of attack
D. Large sideslip
List II
1. Rudder power against asymmetric thrust at low speed
2. Rudder power to de-crab at the lowest approach speed
3. Fin effectiveness when blanketed by the wake
4. Fin behaviour approaching its own stall
Select the correct match.
Answer: D
Correct answer: A-1, B-2, C-3, D-4
The four cases divide into two pairs. Engine failure after take-off and a crosswind landing both test rudder power - control authority against a known moment at low dynamic pressure, asymmetric thrust in the first case and the de-crab in the second.
High angle of attack and large sideslip both test fin effectiveness - whether the stabilising surface still works, the fin being blanketed by the wake in the first and approaching its own stall in the second. Recognising which of the two quantities a case examines is usually enough to place it without recalling the pairing.
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