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UK Civil Aviation Regulations

These are published by the CAA on our UK Regulations pages. EU Regulations and EASA Access Guides published by EASA no longer apply in the UK. Our website and publications are being reviewed to update all references. Any references to EU law and EASA Access guides should be disregarded and where applicable the equivalent UK versions referred to instead.



The 5x5 matrix is used to score safety risks. Safety risk scoring is based on the likelihood and impact of the safety risk occurring.

  IMPACT
LIKELIHOOD   Very Low Low Medium High Very High
Almost certain 5 10 15 20 25
Likely 4 8 12 16 20
Possible 3 6 9 12 15
Unlikely 2 4 6 8 10
Rare 1 2 3 4 5