Which action initiates the formal outage response plan?

• A. Inform ATC and operations
• B. Implement approved alt routing
• C. Switch to backup sensors
• D. Activate contingency procedures

Answer: (D)

Activating contingency procedures is what starts the formal outage response plan. When a significant system outage is identified, triggering contingency procedures officially switches operations into outage mode, mobilizes the incident command structure, and notifies the required stakeholders so everyone knows their roles and the sequence of actions. Once the plan is activated, you carry out the specific response steps—such as informing ATC and operations, implementing approved alternate routing, and switching to backup sensors—as part of the coordinated recovery.