Which alert level permits minor maintenance?

• A. Alert condition I
• B. Alert condition II
• C. Alert condition III
• D. Alert condition IV

Answer: (D)

The level that allows minor maintenance is the lowest-severity alert. When the system is in the least severe condition, risk is reduced, so routine or minor maintenance can be carried out without compromising safety or reliability. As alert levels rise, restrictions tighten and maintenance becomes restricted to safety-critical tasks or postponed until the situation stabilizes. So, minor maintenance is permitted only at the lowest alert level.