In aircraft maintenance, the Aircraft Maintenance Program (AMP) and Last Done/Next Due (LDND) records are critical tools for ensuring compliance, airworthiness, and operational efficiency. While the AMP defines maintenance tasks, thresholds, and intervals, the LDND is the actionable record that tracks these tasks against the actual status of the aircraft and its components.
AMP and LDND: Breaking Down the Roles
AMP (Aircraft Maintenance Program) is a structured guideline that specifies:
Tasks: What needs to be inspected, repaired, or replaced (e.g., “Overhaul fuel pumps every 5 years”).
Thresholds: The initial limits for completing tasks (e.g., 5,000 flight hours, 3,000 cycles, or 5 calendar years).
Intervals: The repetition frequency after the initial task (e.g., every 500 cycles).