What does a symbol 'X' indicate on a 5988-E form?

On the 5988-E form, the symbol 'X' is used specifically to indicate a deadline fault. This is an important distinction within the vehicle documentation process because a deadline fault signifies that the vehicle cannot be used until the issue is resolved, due to the nature of the fault affecting its ability to operate safely or effectively. Recognizing this symbol is critical for maintaining operational readiness and ensuring that vehicles meet safety standards before being deployed or used in the field. It communicates to all personnel that immediate action is required to address the identified fault, thus helping to ensure that all equipment is functioning properly and is safe to operate.