Evidence and maintenance messages
Useful evidence can include crew reports, repeatability, system indications, maintenance messages, physical condition and recent work. The meaning of a message depends on configuration and current documentation. Avoid replacing parts from a message alone. General learning can explain evidence categories, but actual fault isolation must follow approved data.
Applicability check
List the variant, configuration, software, engine or component effectivity and document revision that could change this lesson. Explain why family-level knowledge is not enough for actual work.
> Educational explanation only. Current approved maintenance data and organization procedures control actual work.