Auditors in a Part 145 inspection usually ask first for records that prove control of work, personnel, parts, tooling, and release decisions. The exact mix varies by authority, ratings, scope, and recent findings, but you should expect requests for work orders, maintenance release evidence, training and authorization records, calibration, traceability, and records showing how discrepancies and changes were controlled.

ISO 22400 can be applied in aerospace and MRO environments, but it is not aerospace-specific and does not replace AS9100, regulatory, or customer KPI requirements. It provides a common structure for manufacturing KPIs (like OEE and availability), which must be carefully interpreted for HMLV, repair, and brownfield MRO contexts, and validated against existing MES/ERP data and reporting.