--- title: "ATM/ANS.OR.A.001 – ATM/ANS.OR.A.090: SUBPART A — GENERAL REQUIREMENTS (ATM/ANS.OR.A) (Part-ATM/ANS.OR) — rule index · Avioverse" description: "ATM/ANS.OR.A.001 – ATM/ANS.OR.A.090, Regulation (EU) 2017/373. In accordance with Article 6, this Annex establishes the requirements to be met by the…" url: "https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a" --- # SUBPART A — GENERAL REQUIREMENTS (ATM/ANS.OR.A) ANNEX III COMMON REQUIREMENTS FOR SERVICE PROVIDERS (Part-ATM/ANS.OR) · Air Traffic Management / Air Navigation Services · Regulation (EU) 2017/373 · ATM/ANS.OR.A.001 – ATM/ANS.OR.A.090 On this page 1. ## [ATM/ANS.OR.A.001 Scope](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-001) In accordance with Article 6, this Annex establishes the requirements to be met by the service providers. [GM1 ATM/ANS.OR.A.001 Scope](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-001#gm1-atm-ans-or-a-001) [GM1 ATM/ANS.OR.A.001 Scope](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-001#gm1-atm-ans-or-a-001-2) 2. ## [ATM/ANS.OR.A.005 Application for a service provider certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-005) Application for a service provider certificate or an amendment to an existing certificate shall be made in a form and manner established by the competent… [AMC1 ATM/ANS.OR.A.005 Application for a service provider certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-005#amc1-atm-ans-or-a-005) [GM3 ATM/ANS.OR.A.005 Application for a service provider certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-005#gm3-atm-ans-or-a-005) 3. ## [GM1 to AMC1 ATM/ANS.OR.A.005 Application for a service provider certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/gm1-to-amc1-atm-ans-or-a-005-application-for-a-service-provider-certificate) EXPOSITION — DAT PROVIDERS The exposition should contain the following table of contents: 4. ## [GM2 to AMC1 ATM/ANS.OR.A.005 Application for a service provider certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/gm2-to-amc1-atm-ans-or-a-005-application-for-a-service-provider-certificate) EXPOSITION — DAT PROVIDERS A means to develop the exposition may be by cross-referring to the procedures of the quality manual, which are needed to… 5. ## [ATM/ANS.OR.A.010 Application for a limited certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-010) Notwithstanding point (b), the air traffic services provider may apply for a certificate limited to the provision of services in the airspace under the… [GM1 ATM/ANS.OR.A.010 Application for a limited certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-010#gm1-atm-ans-or-a-010) 6. ## [ATM/ANS.OR.A.015 Declaration by flight information services providers](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-015) Pursuant to Article 7, a flight information services provider may declare its capability and means of discharging the responsibilities associated with… [GM1 ATM/ANS.OR.A.015(b)(1) Declaration by flight information services providers](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-015#gm1-atm-ans-or-a-015-b-1) 7. ## [ATM/ANS.OR.A.020 Means of compliance](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-020) Alternative means of compliance (AltMOC) to the AMC adopted by the Agency may be used by the service provider to establish compliance with the… 8. ## [ATM/ANS.OR.A.025 Continued validity of a certificate](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-025) A service provider's certificate shall remain valid subject to: 9. ## [ATM/ANS.OR.A.030 Continued validity of a declaration of a flight information services provider](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-030) A declaration made by the flight information services provider in accordance with point ATM/ANS.OR.A.015 shall remain valid subject to: 10. ## [ATM/ANS.OR.A.035 Demonstration of compliance](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-035) A service provider shall provide all the relevant evidence to demonstrate compliance with the applicable requirements of this Regulation at the request… [AMC1 ATM/ANS.OR.A.035 Demonstration of compliance](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-035#amc1-atm-ans-or-a-035) [GM1 ATM/ANS.OR.A.035 Demonstration of compliance](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-035#gm1-atm-ans-or-a-035) [GM2 ATM/ANS.OR.A.035 Demonstration of compliance](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-035#gm2-atm-ans-or-a-035) [GM3 ATM/ANS.OR.A.035 Demonstration of compliance](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-035#gm3-atm-ans-or-a-035) 11. ## [ATM/ANS.OR.A.040 Changes — general](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-040) The notification and management of: a change to the functional system or a change that affects the functional system shall be carried out in accordance… [AMC1 ATM/ANS.OR.A.040 Changes — general](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-040#amc1-atm-ans-or-a-040) [AMC1 ATM/ANS.OR.A.040(b) Changes — general](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-040#amc1-atm-ans-or-a-040-b) [AMC2 ATM/ANS.OR.A.040(b) Changes — general](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-040#amc2-atm-ans-or-a-040-b) [GM1 ATM/ANS.OR.A.040(b) Changes — general](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-040#gm1-atm-ans-or-a-040-b) 12. ## [ATM/ANS.OR.A.045 Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045) A service provider planning a change to its functional system shall: [AMC1 ATM/ANS.OR.A.045(a) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#amc1-atm-ans-or-a-045-a) [GM1 ATM/ANS.OR.A.045(a) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-a) [GM2 ATM/ANS.OR.A.045(a) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm2-atm-ans-or-a-045-a) [AMC1 ATM/ANS.OR.A.045(a)(3) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#amc1-atm-ans-or-a-045-a-3) [GM1 ATM/ANS.OR.A.045(a)(3) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-a-3) [AMC1 ATM/ANS.OR.A.045(b) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#amc1-atm-ans-or-a-045-b) [AMC1 ATM/ANS.OR.A.045(c) ; (d) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#amc1-atm-ans-or-a-045-c) [GM1 ATM/ANS.OR.A.045(c) ; (d) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-c) [AMC1 ATM/ANS.OR.A.045(e) Changes to the functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#amc1-atm-ans-or-a-045-e) [GM1 ATM/ANS.OR.A.045(e) Changes to the functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-e) [GM2 ATM/ANS.OR.A.045(e) Changes to the functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm2-atm-ans-or-a-045-e) [GM3 ATM/ANS.OR.A.045(e) Changes to the functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm3-atm-ans-or-a-045-e) [GM4 ATM/ANS.OR.A.045(e) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm4-atm-ans-or-a-045-e) [GM1 ATM/ANS.OR.A.045(e)(2) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-e-2) [GM1 ATM/ANS.OR.A.045(f) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-f) [AMC1 ATM/ANS.OR.A.045(g) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#amc1-atm-ans-or-a-045-g) [GM1 ATM/ANS.OR.A.045(g) and (i) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-g) [GM1 ATM/ANS.OR.A.045(g)(4) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-g-4) [AMC1 ATM/ANS.OR.A.045(j) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#amc1-atm-ans-or-a-045-j) [GM1 ATM/ANS.OR.A.045(j) Changes to a functional system](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-045#gm1-atm-ans-or-a-045-j) 13. ## [ATM/ANS.OR.A.050 Facilitation and cooperation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-050) A service provider shall facilitate inspections and audits by the competent authority or by a qualified entity acting on its behalf and it shall… [GM1 ATM/ANS.OR.A.050 Facilitation and cooperation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-050#gm1-atm-ans-or-a-050) 14. ## [ATM/ANS.OR.A.055 Findings and corrective actions](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-055) After receipt of notification of findings from the competent authority, the service provider shall: [GM1 ATM/ANS.OR.A.055 Findings and corrective actions](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-055#gm1-atm-ans-or-a-055) [AMC1 ATM/ANS.OR.A.055(b) Findings and corrective actions](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-055#amc1-atm-ans-or-a-055-b) [AMC1 ATM/ANS.OR.A.055(c) Findings and corrective actions](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-055#amc1-atm-ans-or-a-055-c) 15. ## [ATM/ANS.OR.A.060 Immediate reaction to a safety problem](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-060) A service provider shall implement any safety measures, including safety directives, mandated by the competent authority in accordance with point… 16. ## [ATM/ANS.OR.A.065 Occurrence reporting](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-065) As part of its management system, the ATM/ANS provider shall establish and maintain an occurrence-reporting system, including mandatory and voluntary… [AMC1 ATM/ANS.OR.A.065 Occurrence reporting](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-065#amc1-atm-ans-or-a-065) [AMC2 ATM/ANS.OR.A.065 Occurrence reporting](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-065#amc2-atm-ans-or-a-065) [AMC3 ATM/ANS.OR.A.065 Occurrence reporting](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-065#amc3-atm-ans-or-a-065) [AMC1 ATM/ANS.OR.A.065(c) Occurrence reporting](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-065#amc1-atm-ans-or-a-065-c) [GM1 ATM/ANS.OR.A.065(c) Occurrence reporting](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-065#gm1-atm-ans-or-a-065-c) [AMC1 ATM/ANS.OR.A.065(e) Occurrence reporting](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-065#amc1-atm-ans-or-a-065-e) 17. ## [ATM/ANS.OR.A.070 Contingency plans](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-070) A service provider shall have in place contingency plans for all the services it provides in the case of events which result in significant degradation… [AMC1 ATM/ANS.OR.A.070 Contingency plans](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-070#amc1-atm-ans-or-a-070) [GM1 ATM/ANS.OR.A.070 Contingency plans](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-070#gm1-atm-ans-or-a-070) 18. ## [ATM/ANS.OR.A.075 Open and transparent provision of services](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-075) A service provider shall provide its services in an open and transparent manner. [AMC1 ATM/ANS.OR.A.075(a) Open and transparent provision of services](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-075#amc1-atm-ans-or-a-075-a) 19. ## [ATM/ANS.OR.A.080 Provision of aeronautical data](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-080) A service provider shall ensure that aeronautical data related to its services is provided in due time to the AIS provider. 20. ## [ATM/ANS.OR.A.085 Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085) When originating, processing or transmitting data to the AIS provider, the service provider shall: [GM1 ATM/ANS.OR.A.085(a) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-a) [GM1 ATM/ANS.OR.A.085(b) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-b) [GM1 ATM/ANS.OR.A.085(b)(4) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-b-4) [GM1 ATM/ANS.OR.A.085(b)(5) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-b-5) [AMC1 ATM/ANS.OR.A.085(b)(8) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#amc1-atm-ans-or-a-085-b-8) [AMC1 ATM/ANS.OR.A.085(d) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#amc1-atm-ans-or-a-085-d) [GM1 ATM/ANS.OR.A.085(d) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-d) [GM2 ATM/ANS.OR.A.085(d) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm2-atm-ans-or-a-085-d) [GM1 ATM/ANS.OR.A.085(e) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-e) [AMC1 ATM/ANS.OR.A.085(f) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#amc1-atm-ans-or-a-085-f) [GM1 ATM/ANS.OR.A.085(f) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-f) [GM1 ATM/ANS.OR.A.085(i) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-i) [GM2 ATM/ANS.OR.A.085(i) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm2-atm-ans-or-a-085-i) [GM1 ATM/ANS.OR.A.085(j) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-j) [GM2 ATM/ANS.OR.A.085(j) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm2-atm-ans-or-a-085-j) [GM1 ATM/ANS.OR.A.085(l) Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-085#gm1-atm-ans-or-a-085-l) 21. ## [GM1 ATM/ANS.OR.085 Aeronautical data quality management](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/gm1-atm-ans-or-085) URGENT DISTRIBUTION OF AERONAUTICAL INFORMATION The obligation to comply with the relevant provisions of ATM/ANS.OR.085 should not inhibit the urgent… 22. ## [ATM/ANS.OR.A.090 Common reference systems for air navigation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-090) For the purpose of air navigation, service providers shall use: [GM1 ATM/ANS.OR.A.090(a) Common reference systems for air navigation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-090#gm1-atm-ans-or-a-090-a) [GM2 ATM/ANS.OR.A.090(a) Common reference systems for air navigation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-090#gm2-atm-ans-or-a-090-a) [AMC1 ATM/ANS.OR.A.090(b) Common reference systems for air navigation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-090#amc1-atm-ans-or-a-090-b) [GM1 ATM/ANS.OR.A.090(b) Common reference systems for air navigation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-090#gm1-atm-ans-or-a-090-b) [GM2 ATM/ANS.OR.A.090(b) Common reference systems for air navigation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-090#gm2-atm-ans-or-a-090-b) [GM1 ATM/ANS.OR.A.090(c) Common reference systems for air navigation](https://avioverse.aero/regulations/easa/atm-ans/annex-iii-common-requirements-for-service/subpart-a/atm-ans-or-a-090#gm1-atm-ans-or-a-090-c) Consolidated from the EASA Easy Access Rules (revision 12 Mar 2025, extracted 13 Oct 2026) for convenience. 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