Discussion
Match each marking in List I with its meaning in List II.
List I
A. Green arc
B. Yellow arc
C. Red radial line
D. White arc
List II
1. Normal continuous operating range
2. Caution range for limited periods
3. A limit that must not be exceeded
4. The flap operating range on an airspeed indicator
Select the correct match.
Answer: C
The colour convention is common across the instrument panel, which is what lets a scale be read at a glance without recalling the numbers. The white arc is the one marking specific to airspeed rather than to engine parameters.
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