GM3 ATM/ANS.OR.A.045(e) Changes to the functional system

• ED Decision 2017/001/R found in: ATM/ANS Provision of Services (2017/373) (Mar 2025)

GM3 ATM/ANS.OR.A.045(e) Changes to the functional system ED Decision 2017/001/R CHANGE AFFECTING MULTIPLE SERVICE PROVIDERS AND AVIATION UNDERTAKINGS — COORDINATION (a) [ATM/ANS.OR.A.045(e)](#_DxCrossRefBm647742061) applies to all the affected service providers involved in the change, and, therefore, they should coordinate dependencies as well as shared assumptions and shared risk mitigations. They should only use the agreed and aligned assumptions and mitigations that are related to more than one service provider or aviation undertaking in their safety or safety support cases, as required by [ATM/ANS.OR.A.045(f)](#_DxCrossRefBm647742061). (b) Assumptions and risk mitigations used during the assessment of the change that are not shared by the affected service providers, can be handled independently by each service provider, and do not need agreement. (c) This coordination means that the affected service providers: (1) have jointly identified the scope of their responsibilities with regard to the change, and in particular their safety responsibilities, e.g. what part of the change will be covered in whose safety (support) assessment case; (2) have jointly identified the dependencies; (3) have jointly identified the hazards associated with the change in the common context; (4) have mutually agreed on the assumptions for the change that jointly relate to them; and (5) have mutually agreed on the mitigations for risks that require joint implementation. (d) Service providers would need to achieve a common understanding about: (1) consequences in the shared operational context; and (2) chains of causes/consequences. (e) Service providers would jointly need to identify their dependencies to be able to assess the change to their functional systems. (f) Where necessary in relation to the dependences identified in accordance with [GM1 ATM/ANS.OR.A.045(e)(1)](#_DxCrossRefBm647742161), the service providers may perform together: (1) identification of hazards/effects; (2) assessment of risks; (3) evaluation of risks; (4) planning and assessment of risk mitigations; and (5) verification. (g) The level of interaction and coordination between service providers and aviation undertakings will vary depending on the particular needs of the change at hand. GM3 ATM/ANS.OR.A.045(e) Changes to the functional system ED Decision 2017/001/R CHANGE AFFECTING MULTIPLE SERVICE PROVIDERS AND AVIATION UNDERTAKINGS — COORDINATION (a)       [ATM/ANS.OR.A.045(e)](#_DxCrossRefBm1726554913) applies to all the affected service providers involved in the change, and, therefore, they should coordinate dependencies as well as shared assumptions and shared risk mitigations. They should only use the agreed and aligned assumptions and mitigations that are related to more than one service provider or aviation undertaking in their safety or safety support cases, as required by [ATM/ANS.OR.A.045(f)](#_DxCrossRefBm1726554913). (b)       Assumptions and risk mitigations used during the assessment of the change that are not shared by the affected service providers, can be handled independently by each service provider, and do not need agreement. (c)       This coordination means that the affected service providers: (1)       have jointly identified the scope of their responsibilities with regard to the change, and in particular their safety responsibilities, e.g. what part of the change will be covered in whose safety (support) assessment case; (2)       have jointly identified the dependencies; (3)       have jointly identified the hazards associated with the change in the common context; (4)       have mutually agreed on the assumptions for the change that jointly relate to them; and (5)       have mutually agreed on the mitigations for risks that require joint implementation. (d)       Service providers would need to achieve a common understanding about: (1)       consequences in the shared operational context; and (2)       chains of causes/consequences. (e)       Service providers would jointly need to identify their dependencies to be able to assess the change to their functional systems. (f)        Where necessary in relation to the dependences identified in accordance with [GM1 ATM/ANS.OR.A.045(e)(1)](#_DxCrossRefBm1726555002), the service providers may perform together: (1)       identification of hazards/effects; (2)       assessment of risks; (3)       evaluation of risks; (4)       planning and assessment of risk mitigations; and (5)       verification. (g)       The level of interaction and coordination between service providers and aviation undertakings will vary depending on the particular needs of the change at hand.