GM1 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)

GM1 ATM/ANS.OR.A.045(e) Changes to the functional system ED Decision 2017/001/R CHANGES AFFECTING MULTIPLE SERVICE PROVIDERS AND AVIATION UNDERTAKINGS — GENERAL (a) Any change proposed by a service provider as defined in [ATM/ANS.OR.A.045(a)](#_DxCrossRefBm647742061) affects other service providers and/or aviation undertakings when: (1) the proposed change may alter the service delivered to other service providers and aviation undertakings as users of that service; or (2) the proposed change may alter the operational context in which the services of other service providers and aviation undertakings are delivered or in which the aviation undertakings are operating. (b) The changes referred to in [ATM/ANS.OR.A.045(e)](#_DxCrossRefBm647742061) could be considered ‘multi-actor changes’ and are those changes that require coordination between the service provider(s) proposing the change and any service providers and aviation undertakings affected by the change(s) due to the presence of dependencies between the service providers that planned the change and other affected service providers and/or other aviation undertakings. This coordination is essential to ensure a correct safety (support) assessment when there are dependencies. (c) A single-actor change is one that is limited to those cases where a change to a service provider’s functional system alters neither the service nor the operational context of other service providers and aviation undertakings. GM1 ATM/ANS.OR.A.045(e) Changes to the functional system ED Decision 2017/001/R CHANGES AFFECTING MULTIPLE SERVICE PROVIDERS AND AVIATION UNDERTAKINGS — GENERAL (a)       Any change proposed by a service provider as defined in [ATM/ANS.OR.A.045(a)](#_DxCrossRefBm1726554913) affects other service providers and/or aviation undertakings when: (1)       the proposed change may alter the service delivered to other service providers and aviation undertakings as users of that service; or (2)       the proposed change may alter the operational context in which the services of other service providers and aviation undertakings are delivered or in which the aviation undertakings are operating. (b)       The changes referred to in [ATM/ANS.OR.A.045(e)](#_DxCrossRefBm1726554913) could be considered ‘multi-actor changes’ and are those changes that require coordination between the service provider(s) proposing the change and any service providers and aviation undertakings affected by the change(s) due to the presence of dependencies between the service providers that planned the change and other affected service providers and/or other aviation undertakings. This coordination is essential to ensure a correct safety (support) assessment when there are dependencies. (c)       A single-actor change is one that is limited to those cases where a change to a service provider’s functional system alters neither the service nor the operational context of other service providers and aviation undertakings.