What is the maximum percentage for Np at PMU Off?

The maximum percentage for Np (propeller speed) at PMU Off is indeed 100% + 2%. This means that under these conditions, the Np can operate effectively up to a maximum of 102%. Operating at Np levels within this range ensures that the propeller remains within safe limits during flight maneuvers and engine operations.

It's important to maintain a clear understanding of the operational limits when the PMU (Power Management Unit) is turned off, as this impacts the control and stability of the aircraft. Exceeding these limits could lead to mechanical issues or performance degradation.

In contrast, the other options present lower or more restrictive maximum limits. For instance, limits like 95% +/- 2% are not applicable in this scenario since they suggest a maximum of only 97%, which is lower than the actual permissible 102%. Similarly, the options that propose 100% +/- 3% and 100% +/- 1% imply wider or narrower margins, which do not align with the defined operational limits for Np at PMU Off.