Aircraft Lease Transition – Structural Evaluation

During a “walkaround inspection” or an MRO (Maintenance, Repair & Overhaul)
task card inspection the damage on an aircraft will be assessed and then can end up
with one of two different requirements:

1. Damage requiring a physical repair or
2. Damage not requiring a physical repair.

There are times when damage may transition from not requiring a physical repair to
requiring one – for example it might be acceptable to fly for a limited number of
cycles/flight hours with the existing damage, but at that stage it will require a physical

To consider damage that does not have a physical repair we can follow through
some simple steps:
Look at the damage type and confirm it is recorded accurately (dent, scratch, etc –
the definitions will be in your structural manual for the aircraft as a reference) and
most importantly is the location of the damage, this determines repair

Check the damage description and consider the location; is the damage is accurate
– this must be correctly recorded.
Look at the noted dimensions for the damage ensuring these reflect what you have
physically on the aircraft; this is very important as the acceptance of damage is
heavily based on such dimensions – (length, width, depth, dimensions to other
critical points such as sensors or edge cut-outs).
Confirm any calculations carried out such as length/depth are correct and ensure
that the required dimensions are noted. Some assessments might require additional
dimensions or considerations dependent on location.
Now we consider the documentation the damage was reviewed with – ensure you
have the revision and or revision date for this and make sure it is an effective repair
for the aircraft.

All corrective actions must be carried out for the repair to be effective (for example
NDT – Non-Destructive Testing). Repairs & their requirements can change over time
and so revision status is critical in any consideration.
Are any repeat inspections required following the assessment or has a repair
category been assigned which differs from the standard inspection requirements –
these should be implemented into the maintenance programme and evidenced as
required for the repair to be acceptable.
Is there any additional damage within the vicinity of the repair – this could affect the
damage depending on location and aircraft, review documentation to ensure it
remains acceptable.

Remember additional considerations are given when damage is close to different
parts of the aircraft such as lap joints, butt joins, sensors, cut-outs, etc so be aware of
flag notes or noted requirements in such cases.

The above list is not exhaustive by any means but offers a typical process where we
consider damage assessments, and no repair has been carried out subsequently.

Check out our designated structures and sheet metal module as part of our
Technical Lease Training Programme HERE

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