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SofemaOnline (SOL) www.sofemaonline.com considers the different roles of SB,s & AD,s BriefingWire.com, 3/01/2021 - Airworthiness Directives Airworthiness Directives (ADs) are legally enforceable rules issued by the Regulatory Authority of the Type Certificate Holder, (TCH) Supplemental Type Certificate Holder (STCH), or Original Equipment Manufacturer (OEM) (may also be issued by other Regulatory Authorities). Now Consider the Following Statements : · Airworthiness Directives (AD,s) are Mandatory. · If an Aircraft is not in compliance with AD requirements its Certificate of Airworthiness is not valid and the aircraft shall not fly legally. · AD,s are only issued by Regulatory Authorities – most usually the authority of the State of Design of the Aircraft or Product.

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