FAQ n.136690

The applicability of 21.A.7 AMCs/GMs is not clear in the case of TCH without new production. Could you please clarify?


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.
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