除了ISO 10972-1中给出的一般要求外，ISO 10972-3:2003还规定了专门适用于塔式起重机机构和相关部件的要求。 这些附加要求涉及起重机机构的布置、特征和特性，以及某些机构部件的最低要求。 ISO 10972-3:2003不包括关于不同极限状态（屈服强度、疲劳、磨损）的能力证明计算规则。 ISO 10972-3:2003不适用于塔式起重机上使用的攀爬机构和相关部件，也不适用于攀爬架。

ISO 10972-3:2003 establishes requirements which apply specifically to the mechanisms and related components of tower cranes, in addition to the general requirements given in ISO 10972-1. These additional requirements concern the arrangement, features and characteristics of the crane mechanisms, and the minimum requirements for certain mechanism components. Rules for the proof of competence calculation regarding different limit states (yield strength, fatigue, wear) are excluded from ISO 10972-3:2003. ISO 10972-3:2003 is not applicable to the climbing mechanisms and related components used on tower cranes, nor to the climbing frame.