What does an FDR "maint" light indication signify?

The FDR "maint" light indication specifically signifies that the IDARS (Integrated Data Acquisition and Recording System) memory is 80% full. This is an important alert for operators, as it signals that storage capacity is nearing its limit and that data management actions should be taken to ensure that critical flight data continues to be recorded effectively. Regular monitoring of this light helps maintain proper operational procedures and ensures that vital information is not lost due to memory overflow.

Recognizing the significance of the IDARS memory capacity is crucial for safety and compliance with regulations, as it ensures all necessary flight data can be captured for future analysis. The presence of this light prompts necessary preventive measures, preventing potential disruptions to data recording processes.