Airframe Serviceability States (PlantUML)
A narrow-body aircraft's serviceability states including deferred defects under the MEL, AOG recovery and long-term storage.
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title Narrow-body airframe serviceability states
[*] --> Serviceable
Serviceable --> InService : dispatched
InService --> Serviceable : turnaround complete
InService --> DeferredDefect : defect raised, MEL category B
DeferredDefect --> Serviceable : rectified inside 3 calendar days
DeferredDefect --> AOG : MEL calendar limit expired
Serviceable --> ACheck : due at 750 flight hours
ACheck --> Serviceable : released to service
Serviceable --> CCheck : due at 7500 flight hours
CCheck --> Serviceable : released after 18 days in the hangar
InService --> AOG : no-go defect away from base
AOG --> Recovery : spare part and engineer dispatched
Recovery --> Serviceable : ferry flight or line repair complete
Serviceable --> Stored : parked beyond 30 days
Stored --> Serviceable : return to service programme complete
Stored --> [*] : retired for part-out
@enduml