Definition
A two-person checklist procedure in which one crewmember reads each checklist item aloud (the challenge) and another crewmember verifies the item and states the result aloud (the response). The exchange confirms that each action has been completed correctly before the flight continues.
Plain English
One pilot calls out a checklist item, and the other pilot checks it and says back what they found. Both pilots hear the item and the result, so nothing gets skipped or assumed.
Context Anchor
Used during crew checklists and takeoff or rejected-takeoff briefings, especially when confirming whether the airplane is performing normally or the takeoff should be stopped.
Derivation
Challenge comes from the Latin calumnia, meaning a formal call or demand. Response comes from the Latin respondere, to answer back. The pairing reflects the procedure exactly: one pilot calls, the other answers.
Why Pilots Care
Verbal confirmation prevents missed steps and keeps both pilots aligned when time and attention are limited.
Intuition Check
Challenge does not mean arguing with someone here. It means calling for a specific check or confirmation, followed by a clear answer.
Example Sentence 1
The captain and first officer ran the before-takeoff checklist using challenge and response, with the first officer reading each item aloud.
Example Sentence 2
The crew continued using challenge and response for the after-landing checklist to maintain clear communication.