1. 8454-1. For aircraft operated under part 91, which of the following records must be retained for at least one year, or until the work is repeated or superseded? A. Records of time since overhaul of items requiring overhaul on a time specified basis. B. Records of maintenance, alterations, preventive maintenance, 100-hour, annual, and progressive inspections. C. Records of the current inspection status of the aircraft, including time since last required inspection.