What does an 'x' signify in aviation inspections?

In aviation inspections, the symbol 'x' is used to indicate that an aircraft is grounded due to a deficiency. This marking serves as a clear visual signal to maintenance personnel and flight crews that there are issues affecting the aircraft's airworthiness, and it should not be operated until these deficiencies are addressed. The use of an 'x' is crucial for safety, as it helps prevent the operation of aircraft that may pose risks to passengers and crew until necessary repairs or maintenance have been completed. This practice is part of the broader framework of ensuring a high standard of safety in aviation operations. Understanding this marking is vital for anyone involved in aircraft maintenance and inspection processes.