What should be done immediately if an error is discovered during flight?

The correct approach when an error is discovered during flight is to communicate, document, and correct it as soon as possible. This ensures that any potential issues are addressed directly and do not compromise safety or performance. Immediate communication allows the crew to be aware of the situation and collaborate on possible solutions. Documenting the error adds to the safety record and can provide valuable information for future training or operational adjustments. Lastly, taking corrective action while in flight may prevent escalation of the error or mitigate any adverse consequences that could result from inaction.

Other options might suggest a lack of immediate response or deferring action until after the flight, which could lead to unsafe conditions or impede necessary corrective measures at a critical moment. It's essential for pilots and crew to address errors promptly to maintain safety and effectiveness in operations.