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The is a simple example of how a fault tree could be
represented. In this example it illustrates the qualitative
approach to the "End Event" in question. A quantitative
result could be derived by determining the probabilities of
the each event and developing the Boolean expression .
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Description
of Events
- 1.
Cargo Bay Opens
- 2.Failure of the
Control Logic
- 3.Failure of the
Command Logic
- 4. Control Circuit
"A" Fails
- 5. Control Circuit
"B" Fails
- 6. Operator
Depresses "Open" Button
- 7. Failure of the
Command Logic Switch circuitry
- 8. Inhibit "A"
"open" Logic Function fails low (see
Failure Mode 11.A3.017)
- 9. Inhibit "B"
"open" Logic Function fails low (see
Failure Mode 11.A6.017)
- 10. "Hold
Off" relay fails shorted
- 11. "Hold
Off" relay prematurely
energised
- 12. Switch
(SW1) Fails short circuit (see Failure Mode
12.A4.009
- 13.) Switch
(SW2) Fails short circuit (see Failure Mode
12.A4.019)
- 14. Software
error
(not
developed)
- 15. "Hold
Off" relay logic fails Hi (see Failure Mode
14.B4.019)
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