CHAPTER Q — VISUAL AIDS FOR DENOTING OBSTACLES
Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7 · Aerodromes · Regulation (EU) No 139/2014 · CS ADR-DSN.Q.840 – CS ADR-DSN.Q.852
On this page
CS ADR-DSN.Q.840 Objects to be marked and/or lighted within the lateral boundaries of the obstacle limitation surfaces
Applicability: The specifications for objects to be marked and/or lighted within the lateral boundaries of the obstacle limitation surfaces apply only to…
GM1 ADR-DSN.Q.840 Objects to be marked and/or lighted within the lateral boundaries of the obstacle limitation surfaces
The marking and/or lighting of obstacles is intended to reduce hazards to aircraft by indicating the presence of the obstacles.
CS ADR-DSN.Q.841 Objects to be marked and/or lighted outside the lateral boundaries of the obstacle limitation surfaces
Applicability: The specifications for objects to be marked and/or lighted outside the lateral boundaries of the obstacle limitation surfaces apply only…
GM1 ADR-DSN.Q.841 Objects to be marked and/or lighted outside the lateral boundaries of the obstacle limitation surfaces
Other objects outside the obstacle limitation surfaces should be marked and/or lighted if a safety assessment indicates that the object could constitute…
CS ADR-DSN.Q.845 Marking of fixed objects
General: All fixed objects to be marked should, whenever practicable, be coloured but if this is not practicable, markers or flags should be displayed on…
GM1 ADR-DSN.Q.845 Marking of fixed objects
Orange and white or alternatively red and white are preferably used, except where such colours merge with the background.
CS ADR-DSN.Q.846 Lighting of fixed objects
The presence of objects which should be lighted, as specified in CS ADR-DSN.Q.840 and CS ADR-DSN.Q.841 should be indicated by low-, medium- or…
GM1 ADR-DSN.Q.846 Lighting of fixed objects
Guidance on how a combination of low-, medium-, and/or high-intensity lights on obstacles should be displayed is given in Figures GM-Q-1 to GM-Q-8.
CS ADR-DSN.Q.847 Lighting of fixed objects with a height less than 45 m above ground level
Low-intensity obstacle lights, Type A or B, should be used where the object is a less extensive one and its height above the surrounding ground is less…
GM1 ADR-DSN.Q.847 Lighting of fixed objects with a height less than 45 m above ground level
A group of buildings is regarded as an extensive object. [Issue:
CS ADR-DSN.Q.848 Lighting of fixed objects with a height 45 m to a height less than 150 m above ground level
Medium-intensity obstacle lights, Type A, B, or C, should be used where the object is an extensive one.
GM1 ADR-DSN.Q.848 Lighting of fixed objects with a height 45 m to a height less than 150 m above ground level
Low-intensity obstacle lights, Type A or B, may be used for obstacles higher than 45 m if it is determined to be sufficient.
CS ADR-DSN.Q.849 Lighting of fixed objects with a height 150 m or more above ground level
High-intensity obstacle lights, Type A, should be used to indicate the presence of an object if its height above the level of the surrounding ground…
GM1 ADR-DSN.Q.849 Lighting of fixed objects with a height 150 m or more above ground level
Where, the use of high-intensity obstacle lights, Type A, at night may dazzle pilots in the vicinity of an aerodrome (within approximately 10 000 m…
CS ADR-DSN.Q.850
Intentionally left blank [Issue: ADR-DSN/3] [Issue: ADR-DSN/5]
GM1 ADR-DSN.Q.850
Intentionally left blank [Issue: ADR-DSN/3] [Issue: ADR-DSN/5]
CS ADR-DSN.Q.851 Marking and lighting of wind turbines
Applicability: When considered as an obstacle a wind turbine should be marked and/or lighted.
GM1 ADR-DSN.Q.851 Marking and lighting of wind turbines
Additional markings and lighting may be provided to the wind turbines if indicated by a safety assessment.
CS ADR-DSN.Q.852 Marking and lighting of overhead wires, cables, supporting towers, etc.
Marking: The wires, cables, etc. to be marked should be equipped with markers;
GM1 ADR-DSN.Q.852 Marking and lighting of overhead wires, cables, supporting towers, etc.
Where high-intensity obstacle lights, Type B, are used, and it is not possible to locate them as described in CS ADR-DSN.Q.852(d)(2), in some cases, this…
Consolidated from the EASA Easy Access Rules (revision 13 Mar 2026, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.
Metis opens with Avioverse in October 2026 · request early access.