Who is responsible for ensuring that proper entries are made into the maintenance log of an aircraft?

The owner or operator of the aircraft holds the primary responsibility for ensuring that proper entries are made into the maintenance log. This includes documenting all maintenance performed, required inspections, and any alterations made to the aircraft. This responsibility is integral to maintaining the airworthiness of the aircraft and ensures compliance with regulatory requirements.

While the pilot in command may be involved in the pre-flight inspections and operational aspects of the aircraft, the overarching accountability for the aircraft's maintenance records falls on the owner or operator. This is because they have the authority and legal obligation to keep the plane in compliance with Federal Aviation Administration (FAA) regulations, which include accurate and timely logging of maintenance activities.

A maintenance technician performs the actual work on the aircraft and may help with documenting those entries; however, they do so under the direction of the owner or operator, who ultimately must ensure everything is recorded correctly. The airframe manufacturer does not have a direct role in maintaining the log or ensuring entries are made, as their involvement is typically limited to initial manufacturing and providing technical support.