Lesson learned
TOB-DEMO-320-006
CurrentEducational exampleEducational example
A career and licensing case explaining why holding a licence does not automatically create certification privileges in every organization.
What happenedA technician assumed that obtaining a licence alone would permit immediate certification on an…
What was foundCertification privileges normally depend on additional conditions such as type rating, recent …
What solved itThe career plan was rebuilt as a staged checklist using official authority and employer requir…
General aircraft
General ATA
Lesson learned
TOB-DEMO-320-005
CurrentEducational exampleEducational example
A training case showing why handover quality depends on recording what was ruled out, not only what was done.
What happenedA recurring defect consumed repeated troubleshooting time across shifts even though several po…
What was foundEach shift recorded actions but did not record the evidence that ruled out earlier assumptions…
What solved itThe team adopted a handover structure that separated facts, conclusions, disproved assumptions…
General aircraft
General ATA
Lesson learned
TOB-DEMO-320-004
CurrentEducational exampleEducational example
A training example on handling conflicting revision, effectivity or task references without improvising a maintenance instruction.
What happenedTwo records appeared to point to different maintenance requirements for the same planned activ…
What was foundThe apparent conflict came from comparing sources with different revision dates and applicabil…
What solved itThe activity was paused until the approved documentation-control process identified the applic…
General aircraft
ATA 05
Lesson learned
TOB-DEMO-320-003
CurrentEducational exampleEducational example
A training example showing how intermittent faults require condition, timing and correlation evidence before a component conclusion.
What happenedAn electrical indication appeared intermittently and could not be reproduced during the first …
What was foundThe defect report lacked the operating phase, power-source configuration, duration, related me…
What solved itThe investigation was reframed around reproducibility and correlated evidence rather than imme…
Airbus A350
ATA 24
Lesson learned
TOB-DEMO-320-002
CurrentEducational exampleEducational example
A training case on preventing repeated work and lost evidence when a landing-gear defect passes between maintenance shifts.
What happenedA landing-gear fault remained open at shift change after several tests and one disturbed conne…
What was foundThe next shift could not tell which aircraft configuration existed during each test, which res…
What solved itA structured handover record was created before work continued.
Boeing 737 MAX
ATA 32
Lesson learned
TOB-DEMO-320-001
CurrentEducational exampleEducational example
A training example showing how to preserve the original indication, compare related evidence and avoid replacing a component before the fault is defined.
What happenedA pneumatic-system indication was reported and the first assumption was that a named valve had…
What was foundThe indication alone did not prove the valve had failed. Related indications, operating condit…
What solved itThe troubleshooting plan was rewritten around evidence and approved fault-isolation data rathe…
Boeing 737 MAX
ATA 36