Engine Start on the Ground 1st and 2nd Attempt results in what cycling pattern?

Engine Start on the Ground 1st and 2nd Attempt results in what cycling pattern?

• A. 90 Seconds ON, 10 Seconds OFF
• B. 60 Seconds ON, 20 Seconds OFF
• C. 120 Seconds ON, 10 Seconds OFF
• D. 30 Seconds ON, 60 Seconds OFF

Answer: (A)

During ground engine starts, the starter has a defined duty cycle to protect the equipment. For both the first and second attempts, the starter is run for 90 seconds and then given a 10-second cooldown. This duration provides enough time for the engine to reach a state where ignition can occur, while the short off period prevents overheating and excessive wear on the starter. The same pattern for the two attempts keeps the start procedure consistent and safe. Shorter on-times might not spool the engine enough for light-off, while longer on-times would risk overheating the starter and associated systems.

During ground engine starts, the starter has a defined duty cycle to protect the equipment. For both the first and second attempts, the starter is run for 90 seconds and then given a 10-second cooldown. This duration provides enough time for the engine to reach a state where ignition can occur, while the short off period prevents overheating and excessive wear on the starter. The same pattern for the two attempts keeps the start procedure consistent and safe. Shorter on-times might not spool the engine enough for light-off, while longer on-times would risk overheating the starter and associated systems.