Search:
Incorrectly linked structure-root failures
Explanation:
A search will be performed for failures anchored at functions at the structure root and are linked with failures (in direction of effects) of the same structure.
Note: structure-spanning failure net links will not be considered in the search
Example:
Abbreviations
- ASIL = Automotive safety integrity level
- BF = Base failure of a base function
- BFn = Base function of a base structure element
- BSE = Base structure element
- Cl Prc = Classification for process characteristic
- Cl Prd = Classification for product characteristic
- Cl Req = Classification for requirement
- CM = Control method
- DA = Detection action
- DC = Diagnostic coverage
- DSCF = Dangerous safety critical failure
- Er Det = Error detection
- Er Resp = Error response
- F = Failure
- FIT = Failure in time
- Fn = Function
- FSM = Functional safety management
- IE = Inspection equipment
- LF = Latent fault
- LFM = Latent fault metric
- OC = Operating condition
- PA = Preventive action
- PE = Process element
- PFH = Probability of failure per Hour
- PMHF = Probabilistic metric for random hardware failures
- PrcC = Process characteristic
- PrdC = Product characteristic
- QM = Quality method
- QR = Quality rule
- Req = Requirement
- RMR = Risk Matrix Ranking
- RP = Reaction plan
- SE = Structure element
- SE ErDet = Structure element for error detections
- SE ErResp = Structure element for error responses
- SFF = Safe failure fraction
- SG = Safety Goal
- SIL = Safety integrity level
- SM = Organisational-SE for “safety mechanisms”
- SPF = Single point fault
- SPFM = Single point fault metric
- TF = Top failure of a top function
- TFn = Top function at root element
- TS = Test sample
- The above structure consists of four system elements (
), each with different amounts of failures (
) assigned. - With the display option hot-click icon “Failure nets” active, it is possible to see how the failures are linked in the failure net (e.g.
). These icons allow us to visually analyze what this Quality Rule will deliver. - If a failure is linked in direction of effects in the failure net then the hot-click icon will be either () or (
).
Search result: 
Of the four top failures (TF) at the root element, two are linked in the direction of effects. These are TF2 and TF3.