IATA Aircraft Lease Guidance
Guidance Material for aircraft leasing Guidance Material for aircraft leasing
Guidance Material and Best Practices for Aircraft LeasesThe requirements of the lease should be clearly defined and a strict procedure based on these requirementsshould be implemented at the start of the aircraft lease. Airlines should also perform regular surveys of theentire aircraft to ensure that all repairs are correctly mapped in the repair file.4. Definitions4.1 Airbus Repair DefinitionsDentScratchRepair category ARepair category BRepair category CA dent is a damaged area which is pushed in, with respect to its usual contour.There is no cross−sectional area change in the material, area edges are smooth.A scratch is a line of damage of any depth and length in the material whichcauses a cross−sectional area change. A sharp object usually causes it.This category of allowable damage is established in such a way that damagewithin this limit does not require a structural repair or additional inspectionsduring the design service goal or the extended service goal, as applicable, of theaircraft.This category of allowable damage is established in such a way that damagewithin this limit does not require a structural repair during the design life goal orthe extended service goal, as applicable, of the aircraft. However, an additionalstructural inspections task may be required before the design service goal isreached. An inspection threshold and repeat interval will be provided for thistype of allowable damage.This category of allowable damage is established in such a way that damagewithin this limit must be permanently repaired within a defined operating limit,e.g.: ‘x’ FCs or ‘x’ FHs or ‘x’ calendar months.4.2 Boeing Repair DefinitionsThe definitions of the different categories of damage tolerant repairs are as follows:Category A repairCategory B repairCategory C repairA permanent repair for which the inspections given in the MPD are sufficient andno other actions are necessaryA permanent repair for which supplemental inspections are necessary at thespecified threshold and repeat intervals.A time-limited repair which must be replaced and reworked within a specified timelimit. Also, supplemental inspections can be necessary at a specified threshold andrepeat interval.The definitions of the different types of repairs that have not been evaluated and analyzed for damagetolerance are as follows:94 4 th Edition 2017
Annex V: Structural Repair File GuidelinesPermanent repairInterim repairTime-Limited RepairA repair where no action is necessary except the operator’s normalmaintenance.A repair that has the necessary structural strength and could stay on theaircraft indefinitely. The repair must be inspected at specified intervals, andreplaced if deterioration is detected or damage is found.A repair that has the necessary structural strength but does not havesufficient durability. This repair must be replaced after a specified time,usually given as a number of FCs, FHs or a calendar time.Other definitionsDamage ToleranceDamage Tolerant RepairDentRepairThe ability of structure to sustain anticipated loads in the presence ofdamage, such as fatigue cracks, until it is detected through inspection ormalfunction 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 usualcontour. There is no cross−sectional area change in the material, area edgesare 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 itsinitial strength.4.3 FAA Repair DefinitionsMajor repairsMinor repairMajor repairs are those that if improperly done, might appreciably affect weight, balance,structural strength, performance, power plant operation, flight characteristics, or otherqualities affecting airworthiness, or that are not done according to accepted practices orelementary operations.Minor repair is any repair other than a major repair.4.4 EASA Repair DefinitionsMinor repairMajor repairA minor repair is one that has no appreciative effect on the mass, balance, structuralstrength, reliability, operational characteristics, noise, fuel venting, exhaust emissionsor other characteristics affecting the airworthiness of the aircraft.All other repairs that are not minor.4 th Edition 2017 95
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Guidance Material and Best Practices for Aircraft Leases
The requirements of the lease should be clearly defined and a strict procedure based on these requirements
should be implemented at the start of the aircraft lease. Airlines should also perform regular surveys of the
entire aircraft to ensure that all repairs are correctly mapped in the repair file.
4. Definitions
4.1 Airbus Repair Definitions
Dent
Scratch
Repair category A
Repair category B
Repair category C
A dent is a damaged area which is pushed in, with respect to its usual contour.
There is no cross−sectional area change in the material, area edges are smooth.
A scratch is a line of damage of any depth and length in the material which
causes a cross−sectional area change. A sharp object usually causes it.
This category of allowable damage is established in such a way that damage
within this limit does not require a structural repair or additional inspections
during the design service goal or the extended service goal, as applicable, of the
aircraft.
This category of allowable damage is established in such a way that damage
within this limit does not require a structural repair during the design life goal or
the extended service goal, as applicable, of the aircraft. However, an additional
structural inspections task may be required before the design service goal is
reached. An inspection threshold and repeat interval will be provided for this
type of allowable damage.
This category of allowable damage is established in such a way that damage
within this limit must be permanently repaired within a defined operating limit,
e.g.: ‘x’ FCs or ‘x’ FHs or ‘x’ calendar months.
4.2 Boeing Repair Definitions
The definitions of the different categories of damage tolerant repairs are as follows:
Category A repair
Category B repair
Category C repair
A permanent repair for which the inspections given in the MPD are sufficient and
no other actions are necessary
A permanent repair for which supplemental inspections are necessary at the
specified threshold and repeat intervals.
A time-limited repair which must be replaced and reworked within a specified time
limit. Also, supplemental inspections can be necessary at a specified threshold and
repeat interval.
The definitions of the different types of repairs that have not been evaluated and analyzed for damage
tolerance are as follows:
94 4 th Edition 2017
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