Discussion
Match each device in List I with what it does in List II.
List I
A. Anti-servo tab
B. Servo tab
C. Q-feel unit
D. Mach trim system
List II
1. Increases stick force on an all moving surface
2. Reduces stick force by driving the surface aerodynamically
3. Generates artificial force varying with dynamic pressure
4. Applies automatic nose up trim
Select the correct match.
Answer: D
Correct answer: A-1, B-2, C-3, D-4
The two tabs are opposites and the trap is to interchange them. An anti-servo tab deflects with the surface, opposing its motion and increasing stick force on an all-moving tailplane. A servo tab deflects against the surface, driving it aerodynamically and reducing the force on a heavy control.
The q-feel unit generates artificial force varying with dynamic pressure, and the Mach trim system applies automatic nose-up trim to counter the tuck. Each is named for what it does, which is the reliable route through the matching.
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