What are the two primary categories of CSOSS procedures, and when are they used?

• A. Normal (routine operations) and emergency (immediate danger).
• B. Normal (routine operations) and casualty (degraded or fault conditions requiring alternate sequences).
• C. Casualty (degraded or fault conditions) and emergency.
• D. Primary and secondary.

Answer: (B)

CSOSS uses two main kinds of procedures to cover how systems are run: normal procedures for routine, expected operations, and casualty procedures for when something goes wrong. Normal procedures guide you through standard steps under normal conditions to accomplish tasks safely and efficiently. When a fault or degraded condition occurs, casualty procedures take over. They provide alternate sequences designed to keep control of the system, isolate the fault, and maintain essential functions despite the problem.

So, normal is used during everyday operation with all systems behaving as expected, and casualty is used when a failure or degraded performance requires you to switch to predefined alternate steps. The other options mix in terms like emergency or use terms (primary/secondary) that aren’t the CSOSS categorization.