What is the standard power percentage range for NR Power-On operation before it is considered cautionary?

• A. 0-95%
• B. 95-101%
• C. 101-103%
• D. 103% and above

Answer: (B)

The standard power percentage range for NR Power-On operation that falls into a cautionary status is between 95% and 101%. This range is critical for operational safety and efficiency. When the NR (Rotor Speed) exceeds 95%, it is an indication that the aircraft is operating at elevated performance levels, which is generally acceptable. However, breaching 101% indicates that the rotor speed is nearing an operational limit. At this level, pilots need to maintain vigilant monitoring of performance and engine parameters to prevent potential mechanical failure or operational hazards.

Maintaining NR within this specified range is essential for ensuring the safe operation of the helicopter, as deviations beyond this can lead to abnormal vibrations, power loss, or damage to the rotor system. Understanding this range allows crew members to make timely adjustments and adhere to safety protocols during flight operations.