spare part
as defined in Directive 2011/65/EU of the European Parliament and of the Council of 8 June…, Article 3, point (27) (Definitions)
a separate part of an EEE that can replace a part of an EEE. The EEE cannot function as intended without that part of the EEE. The functionality of EEE is restored or is upgraded when the part is replaced by a spare part