Engine run testing should be performed at which percentage sequence?

• A. 60/80/100%
• B. 40/60/80%
• C. 50/75/100%
• D. 70/90/110%

Answer: (A)

Engine run testing uses a stepwise buildup of power to safely verify performance across mid, high, and full power while watching for any faults. Moving through 60%, then 80%, and finally 100% provides coverage of representative operating points: 60% lets you observe stable transition and basic responsiveness without stressing the engine, 80% pushes the engine into higher-load behavior to check fuel, air, and lubrication systems under more demanding conditions, and 100% confirms performance at full power and whether safety margins and alarms function properly. This sequence is common because it balances catching issues early at lower loads with ensuring the engine can sustain maximum load.

Sequences that start lower than 60% may miss how the engine behaves under more significant load, while 110% would exceed safe operating limits and isn’t permitted.