This document specifies the technical requirements to minimise the hazards listed in Clause 4 which can arise during the commissioning, operation and maintenance of aircraft jacks, axle jacks and hydraulic tail stanchions 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 document applies to:-all types of aircraft jacks;-axle jacks and hydraulic tail stanchions designed to be used at specific jacking points on the aircraft (examples see Annex A).NOTEA tail stanchion type is intended to be used with one type of aircraft.This document does not apply to aircraft recovery equipment.This document does not establish requirements for noise and vibration.Noise and vibration are dealt with respectively in EN 1915 4 and EN 1915 3.This Part of EN 12312 is not applicable to aircraft jacks, axle jacks and hydraulic tail stanchions which are manufactured before the date of publication of this document 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.