Analysis and safety levels

MAjor SAFETY TRENDS for 2015

Registered occurrences in operational activities:

  • As a result of the annual SMS excellence survey “EUROCONTROL CANSO SMS Standard of Excellence Measurement in 2015” an improvement from 85,7% to 87,7% has been registered, which ranks BULATSA among the top 10 ANSPs, out of the all 44 European countries participating in the measurement.

  • Reported are 351 Aviation Occurrences (AO), compared to 374 in 2014;

  • One serious aviation incident with severity class A was registered, without contribution from ATS units of BULATSA, and one major incident with severity class B;

  • Only one significant incident with severity class C was registered, without contribution from ATS units;

  • 6 occurrences without effect on safety with severity class E were registered, which had contribution from ATS units;

  • 344 incidents without contribution from ATS units, which are occurrences with severity class E, without consequences on safety, and class D ­– unidentified occurrences;

  • The number of occurrences with type “Laser illumination” has remained almost the same: 57 in 2015, compared to 55 in 2014;

  • The occurrences with type “Aircraft collision with birds” during take-off and landing have decreased to 66, compared to 81 in 2014;

  • There is a significant increase of the number of occurrences with types “Aircraft deviation from ATC clearance and instruction” and “Unplanned or erroneously planned flights”;

  • Registered is a reduction of the cases of sector capacity exceedings at Sofia ACC.

Registered occurrences in the technical activities related to ATM: 

  • Reported are 1062 occurrences, compared to 976 in 2014;

  • No aviation incidents with severity classes AA, A and B, have been registered;

  • 27 significant incidents with severity class C, which caused functional failures and respectively had impact on ATS units.
  • 989 occurrences without impact on ATS units, with severity class E, without consequences on safety, and class D – unidentified occurrences.

Number of aviation incidents:

For the period 2008 – 2015, based on smoothed out data from the moving average graphics, a stable trend for improvement of safety is registered: 3.25 times improvement of safety, based on 5-year average – from 0.78 (2008) to 0.24 (2015) AI per 100 000 serviced aircraft.

The aggregated long-term trend for reduction of AI caused by ATS Units, with severity classes A, B, C and E, in the conditions of a constant increase of the number of serviced flights on annual base, is presented on the chart below:

The aggregated data for incidents with classes A, B, C and E, show that the aggregated ANS safety risk is also decreasing: 3.1 times on 5-year average base – from 3 (2008) to 0.97 (2015).  

Taking into account the increased with more than 10% number of the serviced flights in 2015 – 774 702, compared to 703 239 in 2014, BULATSA has ensured the safety of the serviced air traffic and has actually achieved the Target Levels of Safety set by DG CAA for 2015.