Published date: 29 April 2024


This Advisory Circular (AC) describes an acceptable means of compliance with Civil Aviation Rule Part 139 Aerodromes Certification, Operation and Use. In relation to the aerodrome design standards for the obstacle limitation surfaces.


This AC is intended for the holder of an aerodrome operating certificate issued under Part 139 and any other aerodrome operator who promulgates aerodrome data and information in the aeronautical information publication (AIP).

Related rules

This AC relates specifically to Part 139, rule 139.51, Aerodrome Design Requirements, specifically 139.51 (a), Obstacle Limitation Surfaces and Appendix D, Obstacle Restriction and Removal.

Change notice

Revision 2 updates references and key information, makes the language more direct and adds a Version History.