What does MC-1 indicate?

• A. Minor problem, can service and board
• B. Can service but not board pax
• C. No service or pax until cleared
• D. Flight cancelled

Answer: (A)

Maintenance status codes tell you how a reported defect affects what you can do with the flight. MC-1 signals a minor problem that does not block operations, so the aircraft can be serviced and passengers can board as planned. The issue isn’t safety-critical, but it still needs attention so it can be fixed during a subsequent maintenance window or before the next flight.

This is why the option describing a minor problem that allows both service and boarding is the best fit. It’s not a signal to cancel the flight or to bar boarding, which would align with more severe codes. The other scenarios imply greater impact on safety or operations, whereas MC-1 indicates normal flow can continue with a small defect noted for later resolution.