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Airworthiness Directive or “AD” - A document issued by the AAA having jurisdiction over the Engines, identifying an unsafe condition relating to such Engines Description:Airworthiness Notices are issued by the Civil Aviation Authority to circulate information to all concerned with the airworthiness of civil aircraft.Page 1 of 4. AIRWORTHINESS NOTICE. No 17. Issue 2. May 2011 This Airworthiness Notice provides information to aircraft operators and licensed aircraft. No 17. Issue 11. October 2020. Aircraft Maintenance Organisation Approval. 1. Purpose and scope. This Airworthiness Notice provides information to aircraft Hong Kong Airworthiness Notices, Issue 118 PDF (PDF: 5.4MB) new. Information Sheet No. 90. PDF (PDF: 271KB) new. CAD 549.