Question 406General Subjects - 1st Asst/Chief

The correct answer is C. When analyzing trend analysis data in reference to a given limit value for the purposes of scheduling corrective maintenance, the current data should be compared to the limit value and analyzed for the historical trend and for the rate of change over time. This is because both the current data in relation to the limit value, as well as the historical trend and rate of change, are important factors in determining the appropriate timing for corrective maintenance. The current data alone is not sufficient, as the trend and rate of change can indicate whether the system is approaching or moving away from the limit value over time. Similarly, the historical trend and rate of change without consideration of the limit value would not provide a complete picture for maintenance planning. The other options are incorrect because they either ignore the limit value (B), the historical trend (A), or the rate of change over time (D), which are all important factors to consider when analyzing the data for maintenance scheduling.