Chapter 5 of Annex 14, Volume I specifically addresses the marking of aircraft stands on aprons, prescribing that stand markings be designed on the nose wheel guide line principle. The appendices to Annex 14 provide detailed specifications for character dimensions, colors, and spacing for both markings and signs.
Chipped or peeling paint is a FOD hazard. Markings must be repainted when retroreflectivity falls below 80% of original value (typically every 12–18 months in temperate climates; 6–9 months in heavy snow/sanding climates).
No ground service equipment (GSE) or vehicles may be parked inside these lines before the aircraft has completely stopped, the engines are shut down, and the anti-collision beacons are turned off. Equipment Parking and Staging Areas Apron Markings Signs Handbook
The handbook provides guidelines for the design and installation of apron markings and signs, including:
These standards are mandatory for projects funded by the Airport Improvement Program (AIP). Chapter 5 of Annex 14, Volume I specifically
Some sources categorize the system more broadly: red for safety warning, white for traffic/vehicle markings, and yellow for aircraft movement on aprons, taxiways, and runways as per ICAO.
Indicates danger, mandatory stopping, or structural boundaries, such as fuel hydrant zones, jet bridge wheels clearance arcs, and no-encroachment lines. Some sources categorize the system more broadly: red
: This circular provides comprehensive guidance and recommendations on the installation of airport visual aids, including lighting, markings, and signage systems.