Failure Tree Analysis (FTA)
Filter not replaced when required
(What is the event)
Routine Inspection
fails to detect
blocked filter
(Immediate Cause)
Automatic cut-out
fails
(Immediate Cause)
Cut-out
disconnected
(Basic/Primary
cause)
Disconnect
function failure
(Basic/Primary
cause)
Inspection
sequence violated
(Basic/Primary
cause)
Particle meter
faulty
(Basic/Primary
cause)
Inspection not
carried out
(Basic/Primary
cause)
Signal Malfunction
(Basic/Primary
cause)