Which statement about engine starts is true?

Which statement about engine starts is true?

• A. A hot start is indicated when EGT remains within limits
• B. A hung start is indicated when engine reaches idle RPM
• C. A hot start is indicated when EGT exceeds limit
• D. A hung start is indicated when engine exceeds idle RPM

Answer: (C)

During engine starts, you use EGT (exhaust gas temperature) and RPM to judge how the start is proceeding. A hot start is indicated when EGT exceeds the allowable limit, meaning the combustor is overheating and the start should be aborted or fuel flow reduced to prevent damage. If EGT stays within limits, it isn’t a hot start, even if other symptoms occur. A hung start, by contrast, means the engine fails to reach the proper idle RPM; reaching idle would indicate the start is progressing, not hung. Saying a hung start is indicated when the engine exceeds idle RPM would be inconsistent with how starts are judged. Therefore, the statement that a hot start is indicated when EGT exceeds the limit is the true one.

During engine starts, you use EGT (exhaust gas temperature) and RPM to judge how the start is proceeding. A hot start is indicated when EGT exceeds the allowable limit, meaning the combustor is overheating and the start should be aborted or fuel flow reduced to prevent damage. If EGT stays within limits, it isn’t a hot start, even if other symptoms occur. A hung start, by contrast, means the engine fails to reach the proper idle RPM; reaching idle would indicate the start is progressing, not hung. Saying a hung start is indicated when the engine exceeds idle RPM would be inconsistent with how starts are judged. Therefore, the statement that a hot start is indicated when EGT exceeds the limit is the true one.