Desirable Maintenance (HDM):
ED-1-1-20 of Highly Desirable Maintenance (HDM) is a set of maintenance procedures that prioritize safety, reliability, operational efficiency, and cost effectiveness. This type of maintenance is often seen on aircraft, where it is designed to ensure optimal performance and minimal downtime. ED-1-1-20 focuses on early detection, prevention, and correction of potential problems before they occur. This involves conducting regular inspections, repairs, and preventive maintenance to ensure that aircraft systems and components are functioning properly and safely. It also requires regular communication between the maintenance team and the aircraft manufacturer to ensure that any changes and updates to the aircraft are implemented properly.