Discussion
A yellow arc on an engine instrument indicates
Answer: D
Correct answer: A caution range acceptable only for limited periods
Yellow is a caution marking, not a prohibition. Operation within a yellow arc is permitted but should be brief, and it is often associated with transient conditions such as high power during take-off or a temperature that is acceptable while climbing but not in the cruise.
The contrast with red is the point. Red marks a value that must not be exceeded at all, whereas yellow marks a range that may be used with the duration watched. Green is the normal continuous range, in which the engine may be operated indefinitely.
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