During the start sequence, within what time frame should RPMs reach applicable value to be considered acceptable?

During the start sequence, within what time frame should RPMs reach applicable value to be considered acceptable?

• A. Within 60 seconds
• B. Within 15 seconds
• C. Within 45 seconds
• D. Within 10 seconds

Answer: (C)

During a start, the rotor speed must rise to the required value within a defined window to show a healthy, controllable spool. Reaching the applicable RPM within 45 seconds means the engine is accelerating normally and can proceed to the next steps without issue. If that RPM target isn’t reached by about 45 seconds, the start is considered not acceptable, and the standard abort or troubleshooting procedures are followed to prevent potential damage from a faulty start. The other time frames don’t align with the established start procedure: they would be too fast, too slow, or outside the safe/normal sequence, so 45 seconds is the appropriate threshold.

During a start, the rotor speed must rise to the required value within a defined window to show a healthy, controllable spool. Reaching the applicable RPM within 45 seconds means the engine is accelerating normally and can proceed to the next steps without issue. If that RPM target isn’t reached by about 45 seconds, the start is considered not acceptable, and the standard abort or troubleshooting procedures are followed to prevent potential damage from a faulty start. The other time frames don’t align with the established start procedure: they would be too fast, too slow, or outside the safe/normal sequence, so 45 seconds is the appropriate threshold.