Lost records is not the end of the world for an aircraft. Reference AC 43-9C section 12 LOST OR DESTROYED RECORDS.
Occasionally, the records for an aircraft are lost to establish the total time-in-service of the airframe. This can be done by reference to other records that reflect the time-in-service; research of records maintained by repair facilities; and reference to records maintained by individual mechanics, etc. When these things have been done and the record is still incomplete, the owner/operator may make a notarized statement in the new record describing the loss and establishing the time-in-service based on the research and the best estimate of time-in-service.
a. The current status of applicable AD’s may present a more formidable problem. This may require a detailed inspection by maintenance personnel to establish that the applicable AD’s have been complied with. I t can readily be seen that this could entail considerable time, expense, and in some instances, might require recompliance with the AD.
b. Other items required by section 9 1.4 17(a)(2), such as the current status of life-limited parts, time since last overhaul, current inspection staLus, and current list of major alterations, may present difficult problems. Some items may be easier to reestablish than others, but all are problems. Losing maintenance records can be troublesome, costly, and time consuming. Safekeeping of the records is an integral part of a good record keeping system.
There are two types of aircraft records temporary and permanent, which the regulations require the owner to keep for the three major components of every aircraft. These include airframe, each engine, and propeller or rotor.
Temporary Records
1. These consist of a record of all minor maintenance and minor alterations performed on the aircraft by mechanics in accordance with CFR 91 Subpart E.
2. A record of the required inspection performed on the aircraft; whether it is a 100-hour, annual, a progressive inspection, or any other required or approved inspection.
Minor maintenance and alterations records may be discarded when the work is repeated or superseded by other work. The record of routine inspections my also be discarded when the next inspection is completed. However it is good to retain the records indefinite as it show continuity in the maintenance program.
Permanent Record
Permanent records will include the following:
1. Total time in service of the airframe, engine, and propeller.
2. The current status of the life limited parts of each airframe, engine, propeller, rotor, and appliance.
3. Time since last the overhaul of item on the aircraft, which are required to be overhauled on a scheduled time basic.
4. The current inspection status of the aircraft.
5. The current status of applicable Airworthiness Directives (AD’s) and method of compliance.
6. A list of the current major alterations to each airframe, engine, propeller, or rotor.
7. Current operating limitations, including revisions to the aircraft weight and center of gravity, caused by the installation or removal of equipment or alterations.