Top failures with base failures that have incomplete actions

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Top failures with base failures that have incomplete actions

Explanation:

A search will be performed for top failures linked to base failures, whereby at least one base failure has no actions (preventive- or detection actions) assigned and at least one does.

Note:

  • Top failures are failures that have causes but no effects.
  • Base failures are failures that have effects but no causes.

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


  • TF1 and TF2 are two top failures (TF) anchored in the root element of the structure shown above. If you choose to display actions in the structure list as a display option, you can immediately see which actions are anchored at which failures:
  • In fact, another TF is also located in SE1 B, namely F5. The following images of the Graph Editor and Failure Net Editor show how the objects are linked.
  • Via the display options, it is also possible to see where the actions are anchored in the failure net.

Graph Editor:

Failure Net Editor from viewpoint of TF:

Search result Search results:

By viewing the failure net links, it is possible to see that there are two top failures linked to at least one base failure, which has neither a detection- nor preventive action assigned AND is linked to at least one base failure that does have at least one detection- or preventive action assigned. These are TF1 and TF2.

Download QR example