ESSARR 4/6

What is ESARR 4?

ESARR 4 is the EUROCONTROL Safety Regulatory Requirement (ESARR) “Risk Assessment and Mitigation in ATM” (Air Traffic Management). This EUROCONTROL Safety Regulatory Requirement has been prepared by the Safety Regulation Commission. The requirement concerns the use of risk assessment and mitigation, including hazard identification, in Air Traffic Management when introducing and/or planning changes to the ATM System.

ESARR 4 applies to all providers of ATM services in respect of those parts of the ATM/CNS System and supporting services for which they have managerial control.

ESARR 4 fully defines the severity classes applicable to ATM systems. These are:

Severity Levels and ESARR 4 Definitions

  • Level 1: Accident – Complete loss of safety margins
  • Level 2: Serious Incidents – Large reduction in safety margins
  • Level 3: Major Incidents – Major reduction in safety margins
  • Level 4: Significant Incidents – Slight reduction in safety margins
  • Level 5: No immediate effect on safety

What is ESARR 6?

ESARR 6 is the EUROCONTROL Safety Regulatory Requirement (ESARR) “Software in ATM Systems”. ESARR 6 deals with the implementation of software safety assurance systems, which ensure that the risks associated with the use of software in safety related ground-based ATM systems, are reduced to a tolerable level.

EASRR 6 does not prescribe any type of supporting means of compliance for software. This is the role of software assurance standards. It is therefore outside the scope of the standard to invoke specific national or international software assurance standards

The purpose of this requirement is to provide ATM safety regulatory bodies and ATM service providers with a uniform and harmonized set of safety regulatory requirements for use of software in ATM systems.

ESARR 6 references ESARR 4 for the definition of the severity classes applicable to ATM systems.