What is the purpose of documenting both 'as-built' and 'as-maintained' data?

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Documenting both as-built and as-maintained data gives a complete record of what the aircraft was originally configured with and what it is currently configured to operate with. The as-built portion captures the configuration at manufacture—installed equipment, wiring, part numbers, and other baseline details. The as-maintained portion records all changes made after manufacture—modifications, repairs, replacements, overhauls, and updates with dates and who performed them. Having both records lets engineers and maintenance planners compare the original design to the current state, verify continued airworthiness, plan future maintenance, and ensure compliance with regulatory and certification requirements. It also aids troubleshooting and parts compatibility by showing exactly what is installed and how it may have evolved over time. Without keeping both, you risk misinterpreting the current configuration, which can lead to improper maintenance actions or compliance gaps.

The other options don’t fit because simplifying inventory, tracking employee performance, or recording only the most recent changes doesn’t provide the necessary historical context needed for safe operation and regulatory obligations.