Suspected Unapproved Parts Details
This SIB is issued to advise transport aeroplane owners, operators and maintenance personnel of an airworthiness concern affecting carbon brake assemblies which have been modified through the installation of replacement heat packs. Consequently, the affected brake assemblies no longer meet the certification specifications. Only the holder of a European Technical Standard Order Authorisation (ETSOA) or equivalent approval, according to EC 1702/2003, Part 21A.611, which is usually the original equipment manufacturer (OEM), is permitted to design changes to the ETSO equipment. Brake assemblies with unapproved replacement heat packs should no longer bear the ETSO marking. Alternative brake assemblies or brake heat packs can only be approved for installation through an approved Major Change of the original Type Design, which can be obtained from the aeroplane Type Certificate (TC) holder, or through a Supplemental Type Certificate (STC) modification to the aeroplane type design.
The installation of unapproved replacement heat packs may produce unknown effects on the aeroplane on which they are installed. Loss of one brake during a rejected take off operation could result in reduced control of the aeroplane.
