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State
Implementation of the aircraft design
Hazard
The potential for harm arising from an intrinsic property or disposition of something to cause detriment
Probability
A measure or estimation of the likelihood of occurrence of an event
Severity
The seriousness of something undesirable
Risk
Estimation of the seriousness and the likelihood of occurrence of the potential for harm
Risk must be acceptable to:
System Safety
System Safety is (state in which risk is acceptable):
the implementation of an aircraft design …
… in which the seriousness and the likelihood of occurrence …
… of the potential for harm …
… to the passengers and the general public …
… is acceptable!
Simple System
Function is lost --> catastrophic
Redundant system
Function is maintained
--> Major
Only true if the three actuators are independent!
Lots of errors
Increasing complexity + Increasing integration
DAL
Development
Assurance
Levels
The concept of DAL has been introduced to minimize the number of errors that will remain at the end of the developent of Software and Complex Electronic Hardware (Item DAL or IDAL)
(Recently, the DAL concept has been extended to functions and overall system development (Function DAL or FDAL) )
Safety
State in which risk is acceptable
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