5.2.7.7 Protection against natural external influences

Local weather and climate conditions at the aerodrome where the services are provided, lighting conditions, animal interference on cameras/sensors (e.g. insects, birds), etc. may affect and degrade the performance of the visual presentation and the binocular functionality. In order to avoid negative effects on the ATCO’s/AFISO’s ability to provide the ATS, the visual surveillance system should include (as applicable, depending on the selected technical solution) means to reduce the impact caused by animals (e.g. insects, birds), variable light conditions across the field of view, counter-light effects (e.g. glare from direct sunlight/low standing sun), precipitation (e.g. rain, snow, hail), condensation, icing, winds, or any other weather phenomena as applicable to the local conditions at the aerodrome. In case the means of technical protection against the impact of external influences (e.g. bird droppings, precipitation, condensation, dust/dirt build up, etc.) are not sufficient, maintenance procedures should be set up as to ensure that camera installations can be cleaned regularly and on short notice, as needed for service provision.