Which system automatically controls proper operation during engine start instead of manual pilot action?

• A. Electrical control system
• B. Hydraulic control system
• C. ASCS computers
• D. Pneumatic control system

Answer: (C)

During engine start, the sequence and safety checks are handled automatically by ASCS computers. This system monitors key engine parameters—such as RPM, ignition status, oil pressure, and ITT—and controls ignition, fuel flow, and starter engagement. It determines the correct timing for starting and when to cut off the starter, and it can abort the start if any parameter indicates a fault or unsafe condition. This automated control keeps the start consistent, reduces pilot workload, and protects the engine and airframe.

Other systems provide essential functions—electrical power, hydraulic actuation, and pneumatic air for starting—but they do not independently manage the entire start sequence and safety logic. The ASCS computers coordinate the process, making automatic start possible.