GB/T 21635-2008 in English

《GB/T 21635-2008飞机 千斤顶空间尺寸》由519（中国航空工业集团公司）归口，主管部门为中国航空工业集团公司。
本标准规定了在飞机主起点之下提供的最小无障碍空间，用以容纳三脚架式千斤顶，并保证千斤顶与飞机相邻结构之间有足够的间隙。本标准等同采用ISO 1464:1985《航空　三脚架式千斤顶　空间尺寸》。
本标准与ISO 1464:1985相比对标准中的图、表做了编辑性修改。

Scope

This standard specifies the minimum unobstructed space provided below the origin of the main roof of the aircraft to accommodate a tripod jack and to provide adequate clearance between the jack and adjacent structures of the aircraft. This standard does not define all jack space dimensions. In the case of critical space, this standard is only used as a reference for design. The final critical space should be determined according to the actual size of the jack used.