IATA Aircraft Lease Guidance

Annex X: LLP Back-to-Birth Guidelines
These disclaimers state that all the limits listed in the ICA are substantiated by the OEM to the certifying
authorities on the assumption that the engines are operated and maintained in accordance with the OEM
procedures only. Some of the wording used by OEMs appears to indicate that LLP limits become invalid
when PMA or DER is used in their products.
Some OEMs have now gone further and have introduced LLP BtB requirements to prove that an LLP has
never been exposed to PMA or DER parts. These requirements are even being introduced into OEM MRO
contracts with airlines, and are being communicated to the Lessor community.
However, it should be clear that the regulatory agencies give final approval for the life limitations. Moreover,
the PMA and DER manufacturers also need to work to design regulations, and their parts and repairs are also
certified by the authorities. Any changes in life limits caused by PMA or DER material would be listed in the
relevant PMA/DER certification document.
Hence, as far as the regulatory agencies are concerned, the ICA life limits remain valid unless the PMA/DER
material certification document says otherwise.
It is therefore important for the airlines to ensure that, if they use PMA/DER material in products with LLPs,
the certifying documents for all such materials are available to substantiate that no change in life limits is
required.
Any other LLP BtB requirements related to PMA/DER are deemed unnecessary, unworkable and
unreasonable.
4.6 Ferry Flights
In case of ferry flights out of the last airline’s responsibility, it is deemed necessary to provide a certified log of
the hours/cycles/time accumulated, and at what rating.
Such a log can be signed by the flight crew or responsible organization that performed the ferry flight, or an
approved service provider for the owner (MRO, DAR, and CAMO). If needed an allowance for the updated
records to be delivered after the ferry flight should be accounted for in the case they cannot be completed in
real time.
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