This European Standard specifies the technical requirements to minimise the hazards listed in Clause 4 which can arise during the commissioning, operation and maintenance of air start equipment when carried out in accordance with the specifications given by the manufacturer or his authorised representative. It also takes into account some performance requirements recognised as essential by authorities, aircraft and ground support equipment (GSE) manufacturers as well as airlines and handling agencies.This European Standard applies to the following types of air start equipment used for civil aircraft:-stored air systems without compressors;-mobile diesel powered air start units;-mobile turbine powered air start units;-air delivery systems of ramp or passenger boarding bridges,as defined in Clause 3 (Examples see Annex A).This European Standard does not establish requirements for the pressure vessels included in the air start equipment.This European Standard does not establish requirements for noise and vibration.Noise and vibration are dealt with respectively in EN 1915 4 and EN 1915 3.This European Standard does not deal with hazards in respect to a standard automotive chassis and from other vehicles on the apron.This Part of EN 12312 is not applicable to air start equipment which is manufactured before the date of publication of this European Standard by CEN.This part of EN 12312 is intended to be used in conjunction with EN 1915-1, EN 1915-2, EN 1915-3 (for vehicles) and EN 1915-4.