Who is responsible for an aircraft during maintenance?

The responsibility for an aircraft during maintenance primarily lies with the Maintenance, Repair, and Overhaul (MRO) organization and its associated insurance. This is because the MRO organization is tasked with ensuring that all maintenance procedures are performed according to regulatory standards and safety protocols. They take accountability for the integrity and airworthiness of the aircraft, assuming liability for any issues that may arise as a result of maintenance work.

MROs are equipped with specialized knowledge, training, and certifications that enable them to perform the necessary checks and repairs, and they typically have stringent quality control measures in place to ensure compliance with aviation regulations. Additionally, the association with insurance is crucial, as it provides financial protection against potential liabilities that may occur during maintenance operations.

The other entities mentioned, while important in their respective roles, do not hold the same level of direct responsibility for the aircraft during maintenance. The airline's operational team manages scheduling and operational readiness, the aircraft manufacturer handles design and production aspects along with certain warranties, and equipment suppliers provide the components but do not oversee their maintenance. Therefore, the MRO organization stands out as the primary authority during the maintenance phase of an aircraft.