Obstacle 11 on the current ICAO aerodrome obstacle chart, type A, for runway 11/29 at Dublin Airport was constructed in 1991. At this time, preparation and revision of aeronautical charts at the State airports was managed within the Air Navigation Services Office of the Department.
Obstacle 11, the FLS hangar was constructed in 1991 and is approximately 170 metres long by 110 meters wide by 30 metres high. Part of the hangar penetrates the take-off flight path area as depicted on the type A chart. At the point of penetration, the hangar is 720 metres approximately from the runway threshold and penetrates the 1.2% surface by approximately 19.5 metres.
SI 14 of 2002, Irish Aviation Authority (Obstacles to Aircraft in Flight) Order 2002, requires the reporting of obstacles to the authority and provides for the marking and lighting of same as required by the authority. The penetration of the obstacle limitation surface by the FLS building is published on the type A chart, is included in the aeronautical information publication and is also included in the aerodrome licence issued by the Irish Aviation Authority. The building itself is lit with red obstacle lights, which is the required procedure where any building penetrates an obstacle limitation surface.