The gray background on N2 during start ends when the engine becomes ______.

The gray background on N2 during start ends when the engine becomes ______.

• A. Overheated
• B. Off
• C. Stable
• D. Failed

Answer: (C)

During start, the N2 indicator uses a gray background to show the engine is in the start sequence, not yet in normal operation. The end of that phase comes when the engine becomes stable—N2 reaches a steady idle speed within normal limits and the other parameters (like EGT) settle without fluctuations. At that moment the gray background disappears and the engine is considered in normal, stable operation. The other conditions describe abnormal states (overheat, off, or a failed start) and do not represent the normal end of the start sequence.

During start, the N2 indicator uses a gray background to show the engine is in the start sequence, not yet in normal operation. The end of that phase comes when the engine becomes stable—N2 reaches a steady idle speed within normal limits and the other parameters (like EGT) settle without fluctuations. At that moment the gray background disappears and the engine is considered in normal, stable operation. The other conditions describe abnormal states (overheat, off, or a failed start) and do not represent the normal end of the start sequence.