What does MSP code 904 signify?

The MSP code 904 specifically signifies a hard landing category 2 - internal inspection. This designation is crucial because it indicates that following a hard landing, more in-depth examination and checks are required beyond just a visual or surface inspection.

In aviation maintenance, hard landings can impart significant stress on the aircraft's structure and systems that may not be immediately visible. Hence, an internal inspection is necessary to ensure that any potential damage to components such as the airframe, landing gear, and other critical systems is identified and addressed. This level of inspection helps maintain the safety and integrity of the aircraft, ensuring it is airworthy and safe for subsequent flights.

Understanding this classification is important for anyone involved in maintenance and inspection because it guides the necessary protocols to follow after specific flight incidents, leading to better safety outcomes and long-term operational reliability.