What does a Phase Maintenance Inspection (PMI) involve?

A Phase Maintenance Inspection (PMI) involves an extensive examination of the aircraft and its equipment. This type of inspection is typically more thorough than routine checks and is designed to ensure that all systems and components of the aircraft are functioning correctly and safely. During a PMI, maintenance personnel systematically evaluate various parts of the aircraft, including engines, airframes, and avionics, to identify any wear, damage, or necessary repairs.

This extensive inspection is crucial for maintaining airworthiness, as it occurs at designated intervals in the lifecycle of the aircraft, ensuring that the aircraft meets safety standards and regulations. The process involves not only visual inspections but also functional checks and may include disassembly of certain components to access internal systems. This level of care and thoroughness distinguishes PMIs from simpler, less detailed inspections that might focus only on external conditions or follow a routine schedule without in-depth analysis.