Aircraft Maintenance Planning – Last Done, Next Due

Module 1: Introduction to LDND – Last Done, Next Due, and its Intention
This module introduces the concept of LDND and its importance in aircraft maintenance planning.

• The primary function of LDND – The primary function of LDND in aircraft maintenance is to ensure the safety and airworthiness of the aircraft by scheduling preventative maintenance, maintaining regulatory compliance, and optimizing resource allocation.
• How the aircraft life cycle is determined – The aircraft life cycle is determined by how the aircraft was designed, built, and certified.
• The role of MSG-3 in aircraft maintenance – MSG-3 (Maintenance Steering Group-3) is a structured decision-making process used by the aviation industry to develop and optimize aircraft maintenance programs.
• How MSG-3 impacts the MPD – The MSG-3 process is used early in the aircraft’s design based on predicted failure modes and engineering judgment.
• The relationship between the MPD and the AMP – The MPD is a generic maintenance guide for an aircraft type, while the AMP is a customized version of the MPD that reflects the specific aircraft variant and engine type.
• The role of the LDND in aircraft maintenance planning – The LDND takes each of the tasks in the AMP and compares it to the aircraft life cycle in cycles, flight hours, or calendar days.

Module 2: What is Short- & Long-Term Planning
This module covers the difference between short-term and long-term planning in aircraft maintenance.

• Short-term planning – Short-term planning focuses on the immediate and upcoming operational requirements, typically spanning days and weeks, sometimes a few months.
• Long-term planning – Long-term planning focuses on the heavy maintenance and longer-term forecasting of maintenance, typically the heavy maintenance inputs (historically C and D checks).

Module 3: LDND Data Sources
This module covers the different data sources that are used to create and maintain an LDND, including the AMP, maintenance records, and component maintenance manuals.

• AMP (Aircraft Maintenance Program) – The AMP is the approved maintenance plan for an aircraft.
• Maintenance records – Maintenance records are used to track the maintenance history of an aircraft.
• Component maintenance manuals (CMMs) – CMMs provide detailed information on the maintenance requirements of specific aircraft components.

Module 4: Building Your LDND
This module covers the process of building an LDND from scratch, including how to identify maintenance tasks, determine their intervals, and calculate their due dates.

• Identifying maintenance tasks – Maintenance tasks are identified from the AMP and other data sources.
• Determining task intervals – Task intervals are determined from the AMP and other data sources.
• Calculating task due dates – Task due dates are calculated based on the task intervals and the last completion date of the task.

Module 5: Updating the LDND
This module covers the process of updating an LDND, including how to incorporate new maintenance tasks, update intervals, and reschedule tasks as needed.

• Incorporating new maintenance tasks – New maintenance tasks are incorporated into the LDND based on the latest revision of the AMP.
• Updating task intervals – Task intervals are updated based on the latest revision of the AMP.
• Rescheduling tasks – Tasks are rescheduled based on the latest revision of the AMP.

Module 6: Interrogating the LDND
This module covers the process of interrogating an LDND to extract information, such as the next due tasks, the remaining time until tasks are due, and the status of components.

• Identifying the next due tasks – The next due tasks are identified by sorting the LDND by the next due date.
• Determining the remaining time until tasks are due – The remaining time until tasks are due is calculated by subtracting the current date from the next due date.
• Determining the status of components – The status of components is determined by reviewing the maintenance records for the component.

Module 7: Managing Your Maintenance Plan
This module covers the process of managing a maintenance plan, including how to schedule maintenance tasks, allocate resources, and track progress.

• Scheduling maintenance tasks – Maintenance tasks are scheduled based on the LDND and the available resources.
• Allocating resources – Resources are allocated based on the scheduled maintenance tasks.
• Tracking progress – Progress is tracked by monitoring the completion of scheduled maintenance tasks.