In an extremis safety scenario, the PM shall initiate the appropriate control input in lieu of the Two Challenge Rule. This is referred to as implementing which rule?

• A. No Challenge Rule
• B. Two-Challenge Rule
• C. Standard Operating Procedure
• D. Immediate Action Rule

Answer: (A)

When time is critical and there’s an immediate threat to safety, a crew member can act without waiting for the challenge process. That’s the No-Challenge Rule: it allows the Pilot Monitoring (PM) to take the necessary control input right away to avert danger, bypassing the Two Challenge Rule.

So in an extremis situation, the PM taking action instead of initiating the two-challenge process fits the No-Challenge Rule, reflecting the priority of immediate corrective action over verbal challenges. This isn’t the Two-Challenge Rule, which requires the crew to challenge unsafe actions, nor is it a general Standard Operating Procedure or a separately named Immediate Action Rule; the situation specifically calls for bypassing challenges in favor of prompt action, which is precisely what No-Challenge Rule covers.