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Fault Tree
Analysis (example)
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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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