Malfunction Tree Analysis (FTA) Si30-408
96 Troubleshooting
4. Malfunction Tree Analysis (FTA)
What is FTA? (Fault Tree Analysis)
For analyzing a symptom, put the causes relating to the phenomenon in a dendritic figure.
For project with VRV system, general contractors and subcontractors generally enter in the
supply route. As a recent trend, they often request an explanation with FTA method. (i.e., only a
reasonable explanation can be accepted.)
With this method, the causes can be analyzed logically and reasonably, and causes can also be
narrowed down by using a process of elimination.
Moreover, in explanation or reporting, this method can make them persuasive.
Cause
Q
of symptom
Cause
R
of symptom
Symptom
Cause A of cause
Q
Cause B of cause
Q
Cause C of cause
R
Cause D of cause
R
No problems were found by investigation.
No problems were found by investigation.
In the range checked, no problems were
found, however, the possibility of
problems still remains.
Part failure, after replacement, the state
is perfectly good.
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