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Integrated and Modular Systems for Commercial ... - Nonstop Systems

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Hazard<br />

Probability<br />

Probable<br />

Improbable<br />

Extremely<br />

Improbable<br />

FAA/JAA Criticality Index<br />

Unacceptable<br />

Unacceptable<br />

Acceptable<br />

unless single failure<br />

Critical<br />

(A)<br />

failure contributes to, or<br />

causes a failure condition<br />

which would prevent<br />

continued safe flight <strong>and</strong><br />

l<strong>and</strong>ing<br />

Unacceptable<br />

Conditionally<br />

Acceptable<br />

Acceptable<br />

unless single failure<br />

Essential (B)<br />

failure contributes to, or<br />

causes a failure condition<br />

which would significantly<br />

impact airplane safety or<br />

crew ability to cope with<br />

adverse operating condit.<br />

Acceptable<br />

Acceptable<br />

Acceptable<br />

Non-Essential<br />

(C)<br />

failure would not<br />

contribute<br />

to, or causes a failure<br />

condition which would<br />

significantly impact airplane<br />

safety or crew ability to<br />

cope with adverse condit.<br />

- allowed combinations of hazard severity <strong>and</strong> probability -<br />

Equipment<br />

Category<br />

60<br />

©1995-1997 F.M.G. Dörenberg

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