IATA Aircraft Lease Guidance

Annex V: Structural Repair File Guidelines
Permanent repair
Interim repair
Time-Limited Repair
A repair where no action is necessary except the operator’s normal
maintenance.
A repair that has the necessary structural strength and could stay on the
aircraft indefinitely. The repair must be inspected at specified intervals, and
replaced if deterioration is detected or damage is found.
A repair that has the necessary structural strength but does not have
sufficient durability. This repair must be replaced after a specified time,
usually given as a number of FCs, FHs or a calendar time.
Other definitions
Damage Tolerance
Damage Tolerant Repair
Dent
Repair
The ability of structure to sustain anticipated loads in the presence of
damage, such as fatigue cracks, until it is detected through inspection or
malfunction and repaired.
A repair that meets the necessary damage tolerance conditions.
A dent is a damaged area which is pushed in or out, with respect to its usual
contour. There is no cross−sectional area change in the material, area edges
are smooth and there is no damage to the underlying structure.
The rebuild or rework of a damaged assembly to return it to all or part of its
initial strength.
4.3 FAA Repair Definitions
Major repairs
Minor repair
Major repairs are those that if improperly done, might appreciably affect weight, balance,
structural strength, performance, power plant operation, flight characteristics, or other
qualities affecting airworthiness, or that are not done according to accepted practices or
elementary operations.
Minor repair is any repair other than a major repair.
4.4 EASA Repair Definitions
Minor repair
Major repair
A minor repair is one that has no appreciative effect on the mass, balance, structural
strength, reliability, operational characteristics, noise, fuel venting, exhaust emissions
or other characteristics affecting the airworthiness of the aircraft.
All other repairs that are not minor.
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