Discussion
Match each cause in List I with the type of drift it produces in List II.
List I
A. Bearing friction
B. Earth rotation
C. Change of longitude in flight
D. Rotor imbalance
List II
1. Real drift from friction in the bearings
2. Apparent drift proportional to sine of latitude
3. Transport wander, apparent and direction dependent
4. Real drift from an out-of-balance rotor
Select the correct match.
Answer: C
Correct answer: A-1, B-2, C-3, D-4
The four divide into two real causes and two apparent ones. Bearing friction and rotor imbalance both apply torques, so the axis genuinely moves - real drift, unpredictable and correctable only by realignment.
Earth rotation and change of longitude both leave the axis fixed while the reference frame turns - apparent drift, computable from latitude and track and therefore compensable by design. Sorting the list into real and apparent first settles the matching.
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