Work a defect from symptom to cause

ATA-chapter guides

Fault-isolation guides organized by ATA chapter: the symptom as the crew or maintenance sees it, then the probable causes.

Ranked probable causes

Each cause carries a likelihood, the checks that confirm it, and the corrective action — worked top-down.

Case log

Open a case from any guide, record the aircraft, tail, notes, and outcome, and mark it resolved when you close it out.

PDF export

Export a worked case — the guide it referenced and your findings — as a PDF for the record or for follow-up.