Which statement about engine instrument markings is true?

Which statement about engine instrument markings is true?

• A. A red triangle mark indicates normal operation
• B. A red triangle mark indicates the maximum limit for high transients such as starting
• C. A red triangle mark indicates a restricted operating range
• D. A red triangle mark indicates maintenance is required

Answer: (B)

When you see a red triangle on an engine instrument, it marks the maximum limit for high transient conditions, such as starting or rapid throttle movement. It’s a boundary for brief, intense moments, not for normal operation, and it protects the engine from transient stresses if you momentarily push toward that limit. This is different from the normal operating range (often shown in a green arc) and isn’t a signal that maintenance is required. So the statement about the red triangle indicating the maximum limit for high transients is the correct interpretation.

When you see a red triangle on an engine instrument, it marks the maximum limit for high transient conditions, such as starting or rapid throttle movement. It’s a boundary for brief, intense moments, not for normal operation, and it protects the engine from transient stresses if you momentarily push toward that limit. This is different from the normal operating range (often shown in a green arc) and isn’t a signal that maintenance is required. So the statement about the red triangle indicating the maximum limit for high transients is the correct interpretation.