What are the typical indicators of a successful engine start on the A320?

• A. Transient N1 spike only.
• B. Stable engine parameters (N1/N2, EGT, ITT) within normal ranges, with hydromechanical and electrical monitors showing normal operation.
• C. No change in parameters after start.
• D. Immediate maximum thrust.

Answer: (B)

A successful start is shown when the engine parameters settle into their normal idle ranges and all monitoring systems confirm normal operation. In practice, you look for N1 and N2 moving through the start sequence and then stabilizing at idle, with the turbine inlet temperature indicators (EGT/ITT) rising to within normal limits and remaining there as fuel flow is managed. Oil pressure should come up to the normal range, and the hydraulic and electrical system displays should show no faults or abnormal warnings. This combination—stable N1/N2 ahead of idle, controlled temperature readings, and healthy system monitors—indicates the engine has started reliably and is ready to be advanced to a higher thrust if required.

A transient N1 spike can occur as the engine accelerates, but it’s not the sole indicator of a successful start; the key is that readings settle and stay within normal ranges. If there’s no change after start, the engine hasn’t initiated a proper start sequence. If thrust were applied to maximum immediately during start, that would be outside the normal start procedure and could cause damage; normally thrust is not advanced to maximum until after a successful start and a stable idle state is achieved.