The diagram shown in the illustration may be used to determine the proper operation of the engine. Which of the following statements represents an accurate interpretation of the diagram? Illustration MO-0126

Correct Answer: Option C — Ideally the engine should be operated in area "A"; however, it is permissible to intermittently operate the engine in area "B".

Standard diesel operating envelopes dictate that continuous loading should remain within area A, while area B permits restricted, temporary operation during transient or adverse external hull resistance conditions.