Who retains the Basis of Certification (BoC) for aircraft derived from commercial models and ensures it remains in compliance?
The DND Basis of Certification (BoC) for commercially-derived aircraft is documented in the DND Type Certificate Data Sheet (TCDS) and retained by the Type Certificate Holder (TCH), usually the DND Technical Authority (TA). The Type Certificate Holder has the responsibility to ensure that the aircraft type design remains in compliance with the BoC. If a design change is required and the existing BoC is not adequate, then the TA is required to contact the Technical Airworthiness Authority (TAA) who will help identify the appropriate additions or amendments to the BoC.
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