CS ADR-DSN.R.870 Unserviceable areas

• ED Decision 2014/013/R found in: Aerodromes (139/2014) Part-ADR.AR Part-ADR.OR Part-ADR.OPS CS-ADR-DSN CS-HPT-DSN (Jun 2023)
• ED Decision 2025/004/R found in: Easy Access Rules for Aerodromes (Mar 2026)

CS ADR-DSN.R.870 Unserviceable areas ED Decision 2014/013/R (a) Applicability of unserviceability markers and lights: Unserviceability markers should be displayed wherever any portion of a taxiway, apron, or holding bay is declared unfit for the movement of aircraft but it is still possible for aircraft to bypass the area safely. On a movement area used at night, unserviceability lights should be used. (b) Location: Unserviceability markers and lights should be placed at intervals sufficiently close so as to delineate the unserviceable area. (c) Characteristics: (1) Unserviceability markers should consist of conspicuous upstanding devices such as flags, cones, or marker boards. (2) An unserviceability light should consist of a red fixed light. The light should have intensity sufficient to ensure conspicuity considering the intensity of the adjacent lights and the general level of illumination against which it would normally be viewed. In no case should the intensity be less than 10 cd of red light. (3) An unserviceability cone should be at least 0.5 m in height and red, orange, or yellow, or any one of these colours in combination with white. (4) An unserviceability flag should be at least 0.5 m square and red, orange, or yellow, or any one of these colours in combination with white. (5) An unserviceability marker board should be at least 0.5 m in height and 0.9 m in length, with alternate red and white, or orange and white vertical stripes. CS ADR-DSN.R.870 Unserviceable areas ED Decision 2014/013/R (a) Applicability of unserviceability markers and lights: Unserviceability markers should be displayed wherever any portion of a taxiway, apron, or holding bay is declared unfit for the movement of aircraft but it is still possible for aircraft to bypass the area safely. On a movement area used at night, unserviceability lights should be used. (b) Location: Unserviceability markers and lights should be placed at intervals sufficiently close so as to delineate the unserviceable area. (c) Characteristics: (1) Unserviceability markers should consist of conspicuous upstanding devices such as flags, cones, or marker boards. (2) An unserviceability light should consist of a red fixed light. The light should have intensity sufficient to ensure conspicuity considering the intensity of the adjacent lights and the general level of illumination against which it would normally be viewed. In no case should the intensity be less than 10 cd of red light. (3) An unserviceability cone should be at least 0.5 m in height and red, orange, or yellow, or any one of these colours in combination with white. (4) An unserviceability flag should be at least 0.5 m square and red, orange, or yellow, or any one of these colours in combination with white. (5) An unserviceability marker board should be at least 0.5 m in height and 0.9 m in length, with alternate red and white, or orange and white vertical stripes. #### CS ADR-DSN.R.870 Unserviceable areas *ED Decision 2025/004/R* (a) Characteristics: (1) Unserviceability markers should consist of conspicuous upstanding devices such as flags, cones, or marker boards. (2) An unserviceability light should consist of a red fixed light. The light should have intensity sufficient to ensure conspicuity considering the intensity of the adjacent lights and the general level of illumination against which it would normally be viewed. In no case should the intensity be less than 10 cd of red light. (3) An unserviceability cone should be at least 0.5 m in height and red, orange, or yellow, or any one of these colours in combination with white. (4) An unserviceability flag should be at least 0.5 m square and red, orange, or yellow, or any one of these colours in combination with white. (5) An unserviceability marker board should be at least 0.5 m in height and 0.9 m in length, with alternate red and white, or orange and white vertical stripes. [Issue: ADR-DSN/7]