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145.A.45 requires the organisation to hold and use applicable, current maintenance data when performing maintenance, including the instructions for continuing airworthiness issued by the type certificate holder and any additional data specified by the competent authority.
What it means in practice
Maintenance data includes all instructions, procedures, and information needed to carry out maintenance correctly. This covers aircraft maintenance manuals, component maintenance manuals, structural repair manuals, wiring diagrams, service bulletins, airworthiness directives, and any other data issued by the type certificate holder or supplemental type certificate holder. The organisation must ensure that this data is available and up to date at the point of use.
In practice, this means having a system to receive, control, and distribute amendments and revisions to maintenance data. It also means ensuring that the correct revision of data is used for each task. Organisations may hold data in paper or electronic form, provided it is legible, accessible, and controlled.
Key requirements
The organisation must hold current and applicable maintenance data for all aircraft and components within its approved scope. A procedure must exist to ensure data is kept up to date, including a system for receiving and incorporating amendments. Maintenance data must be readily available to the personnel who need it at the point where the work is being carried out. The organisation must not use maintenance data from unapproved sources.
Where the organisation modifies maintenance data into internal work cards or task instructions, a process must be in place to verify that the work card accurately reflects the source data and is updated whenever the source data is amended.
Common compliance gaps
Using outdated maintenance data is one of the most frequently cited findings across Part 145 audits. This occurs when amendment services lapse, when personnel use locally printed copies that have not been updated, or when internal work cards are not revised to reflect changes in the source data. Electronic data management systems mitigate some of these risks, but they must still be monitored to confirm subscriptions are active and revisions are loading correctly.
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