How long must the record of a 100 hour inspection be retained?

The correct duration for retaining the records of a 100-hour inspection is one year after it is performed. This requirement falls under 14 CFR Part 91.417, which mandates that maintenance records must be kept for a prescribed duration, ensuring that all necessary documentation is available for regulatory compliance and safety verification.

The one-year timeframe allows for adequate tracking of maintenance history, enabling owners and operators to refer to these records for ongoing maintenance planning or inspections. Retaining the records also aids in demonstrating compliance in the event of an FAA inspection or audit.

The other options suggest retention periods that do not align with regulatory requirements. Retaining records until the next scheduled maintenance may not provide a sufficient historical record for maintenance continuity. Keeping records until the aircraft is sold or for three years unnecessarily prolongs the obligation beyond what is needed for each specific 100-hour inspection. Thus, the one-year retention period is both efficient and aligned with regulatory stipulations.