--- title: "CS ADR-DSN.J.465 – CS ADR-DSN.J.487: CHAPTER J — OBSTACLE LIMITATION REQUIREMENTS (Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes) — rule index · Avioverse" description: "CS ADR-DSN.J.465 – CS ADR-DSN.J.487, Regulation (EU) No 139/2014. Obstacle limitation requirements should be distinguished between:" url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements" --- # CHAPTER J — OBSTACLE LIMITATION REQUIREMENTS Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7 · Aerodromes · Regulation (EU) No 139/2014 · CS ADR-DSN.J.465 – CS ADR-DSN.J.487 On this page 1. ## [CS ADR-DSN.J.465 General](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-465) Obstacle limitation requirements should be distinguished between: 2. ## [GM1 ADR-DSN.J.465 General](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-465) The requirements for obstacle limitation surfaces are specified on the basis of the intended use of a runway, i.e. 3. ## [CS ADR-DSN.J.470 Non-instrument runways](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-470) The following obstacle limitation surfaces should be established for a non-instrument runway: 4. ## [GM1 ADR-DSN.J.470 Non-instrument runways](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-470) Circumstances in which the shielding principle may reasonably be applied are described in the ICAO Doc 9137, Airport Services Manual, Part 6, Control of… 5. ## [CS ADR-DSN.J.475 Non-precision approach runways](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-475) The following obstacle limitation surfaces should be established for a non-precision approach runway: 6. ## [GM1 ADR-DSN.J.475 Non-precision approach runways](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-475) If it is of particular importance for safe operation on circuits, arrival routes towards the aerodrome or on departure or missed approach climb-paths, an… 7. ## [CS ADR-DSN.J.480 Precision approach runways](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-480) The following obstacle limitation surfaces should be established for a precision approach runway Category I: 8. ## [GM1 ADR-DSN.J.480 Precision approach runways](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-480) The following obstacle limitation surfaces should be established for a precision approach runway Category I: 9. ## [CS ADR-DSN.J.485 Runways meant for take-off](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-485) The safety objective of the take-off climb surface slopes and dimensions is to allow safe take-off operations by defining the limits above which new… 10. ## [GM1 ADR-DSN.J.485 Runways meant for take-off](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-485) If no object reaches the 2 % (1:50) take-off climb surface, an obstacle-free surface of 1.6 % (1:62.5) should be established. 11. ## [CS ADR-DSN.J.486 Other objects](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-486) Objects which do not project through the approach surface but which would nevertheless adversely affect the optimum siting or performance of visual or… 12. ## [GM1 ADR-DSN.J.486 Other objects](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-486) In certain circumstances, objects that do not project above any of the obstacle limitation surfaces may constitute a hazard to aeroplanes as, for… 13. ## [CS ADR-DSN.J.487 Objects outside the obstacle limitation surfaces](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-487) Applicability: The specifications in paragraph (b) below apply only to the area under control of the aerodrome operator. 14. ## [GM1 ADR-DSN.J.487 Objects outside the obstacle limitation surfaces](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-487) Beyond the limits of the obstacle limitation surfaces the safety assessment should be conducted for the proposed constructions that extend above the… Consolidated from the EASA Easy Access Rules (revision 13 Mar 2026, extracted 13 Oct 2026) for convenience. 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