IATA Aircraft Lease Guidance

Guidance Material and Best Practices for Aircraft Leases
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OEM Statement
If an LLP was installed new into an engine/APU/gear during shop visit and no certificate of manufacture
is available, then an OEM statement that confirms manufacture of the relevant LLP can be accepted.
In order for such a statement to be accepted, it must contain following information:
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OEM Company Name and Logo
Signature, stamp, or electronic document approval statement from the OEM
Description, P/N, and S/N of LLP
Date of sale and Buyer description
4.2 On-off Logs
Once the part is installed on an engine/APU/gear, it can be removed and installed on another
engine/APU/gear. It is therefore important to determine the part’s movements. The on-off logs are
documents issued during a maintenance event, and show parts removed from one engine/APU/gear (“off”)
and installed on another engine/APU/gear (“on”).
There is no specific format for on-off logs, and MROs or operators may use different terms for them, but the
following items should be addressed to satisfy the expectations as listed in paragraph 3:
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Off logs should be certified documents signed or approved by the operator. They can be created by an
approved service provider to the operator (MRO, Designated Airworthiness Representative (DAR), and
Continuing Airworthiness Management Organization (CAMO)) but the operator should counter-sign, or
there should be a separate statement to confirm that the service provider is authorized to create
statements on behalf of the operator.
On logs should always be certified documents. They can be created by the current operator or its
authorized service provider, or if applicable after shop visit, by the MRO that released to service the
engine/APU/gear in which the LLP was installed.
Type, S/N, TSN, and CSN of engine/APU/gear the LLP was removed from.
Type, S/N, TSN, and CSN of engine/APU/gear the LLP was installed on.
Description, P/N, S/N of the LLP.
TSN, CSN, or time of the LLP as is relevant to determine compliance with the ICA.
The relevant ICA limits that apply to the LLP and the life remaining.
Details on accumulated hours/cycles/time on different models, as required for determining correct life
remaining for mixed-model operations as per the ICA.
It has to be noted that more details may be required for engine models using thrust bumps, flight profiles, or
pilot training restrictions. For these engines, additional information has to be made available. In case
operators track per module, it must at all times be clear on what parent model the LLP accumulated its
hours/cycles/time as relevant per the ICA.
126 4 th Edition 2017