FAQ n.136690

Indeed, this has not been clarified at the level of the respective AMC/GM. Certain parts of the AMC/GM may raise questions on 'retroactive' application. 

1. In regard to the topic of ICA identification, AMC2 21.A.7(a) Identification of ICA and AMC 1 21.A.7(b) Identification of a complete set of instructions for continued airworthiness (ICA), should be applied for: 
   • new design approvals (TC/STC) certified after the 18th of May 2022 
   • for existing design approvals at the next opportunity of a TCDS/STC/STCDS update.
2. In regard to the topic of ICA format, GM2 21.A.7(b) ICA — format, should be applied for a new design approval (S)TC applied after the 18th of May 2022.