Discussion
A red arc on an engine instrument scale marks
Answer: C
Correct answer: A limit that must not be exceeded
A red radial line or red arc marks a limiting value: exceeding it risks damage, and any exceedance must be recorded and reported for maintenance action.
The colour code is consistent across engine instruments. Green marks the normal operating range, yellow a caution range acceptable only for limited periods, and red the limit itself. Because red admits of no time allowance at all, it is quite different from yellow, which is the trap in most questions on the subject.
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