An Airworthiness Directive (commonly abbreviated as AD) is a notification to owners and operators of certified aircraft that a known safety deficiency with a particular model of aircraft, engine, avionics or other system exists and must be corrected.[1][2]
If a certified aircraft has outstanding airworthiness directives that have not been complied with, the aircraft is not considered airworthy.[1][2] Thus, it is mandatory for an aircraft operator to comply with an AD.
ADs usually result from service difficulty reporting by operators or from the results of aircraft accident investigations. They are issued either by the national civil aviation authority of the country of aircraft manufacture or of aircraft registration. When ADs are issued by the country of registration they are almost always coordinated with the civil aviation authority of the country of manufacture to ensure that conflicting ADs are not issued.
In detail, the purpose of an AD is to notify aircraft owners:
that the aircraft may have an unsafe condition, or[3]
that the aircraft may not be in conformity with its basis of certification or of other conditions that affect the aircraft's airworthiness, or[3]
that there are mandatory actions that must be carried out to ensure continued safe operation, or[3]
that, in some urgent cases, the aircraft must not be flown until a corrective action plan is designed and carried out.[3]
ADs are mandatory in most jurisdictions and often contain dates or aircraft flying hours by which compliance must be completed.
The FAA issues ADs by three different processes:[5]
Standard AD process: Notice of Proposed Rulemaking (NPRM), followed by a Final Rule
Final Rule and Request for Comments
Emergency airworthiness directives – issued without time for comment. This is only used issued "when an unsafe condition exists that requires immediate action by an owner/operator...to rapidly correct an urgent safety of flight situation."[5]
^ abcTransport Canada (October 2008). . Archived from the original on 17 April 2011. Retrieved 3 November 2008.
^ abTransport Canada (January 2008). . Archived from the original on 7 December 2008. Retrieved 3 November 2008.
^ abcdTransport Canada (January 2008). . Archived from the original on 18 May 2013. Retrieved 3 November 2008.
^Pilot's Handbook of Aeronautical Knowledge. US Department of Transportations, Federal Aviation Administration. 2016. pp. 9–12.
^ abFederal Aviation Administration (October 2009). "Types of Airworthiness Directives". from the original on 16 October 2009. Retrieved 4 October 2009.
External linksedit
FAA Airworthiness Directives 15 May 2021 at the Wayback Machine
EASA Airworthiness Directives
CAA Airworthiness Directives
April 09, 2024
airworthiness, directive, commonly, abbreviated, notification, owners, operators, certified, aircraft, that, known, safety, deficiency, with, particular, model, aircraft, engine, avionics, other, system, exists, must, corrected, certified, aircraft, outstandin. An Airworthiness Directive commonly abbreviated as AD is a notification to owners and operators of certified aircraft that a known safety deficiency with a particular model of aircraft engine avionics or other system exists and must be corrected 1 2 If a certified aircraft has outstanding airworthiness directives that have not been complied with the aircraft is not considered airworthy 1 2 Thus it is mandatory for an aircraft operator to comply with an AD Contents 1 Purpose 2 Issuance 3 National procedures 3 1 United States 4 See also 5 References 6 External linksPurpose editADs usually result from service difficulty reporting by operators or from the results of aircraft accident investigations They are issued either by the national civil aviation authority of the country of aircraft manufacture or of aircraft registration When ADs are issued by the country of registration they are almost always coordinated with the civil aviation authority of the country of manufacture to ensure that conflicting ADs are not issued In detail the purpose of an AD is to notify aircraft owners that the aircraft may have an unsafe condition or 3 that the aircraft may not be in conformity with its basis of certification or of other conditions that affect the aircraft s airworthiness or 3 that there are mandatory actions that must be carried out to ensure continued safe operation or 3 that in some urgent cases the aircraft must not be flown until a corrective action plan is designed and carried out 3 ADs are mandatory in most jurisdictions and often contain dates or aircraft flying hours by which compliance must be completed ADs may be divided into two categories 4 Those of an emergency nature requiring immediate compliance prior to further flight and Those of a less urgent nature requiring compliance within a specified period of time Issuance editADs are issued by most civil aviation regulatory authorities including Civil Aviation Safety Authority Australia European Aviation Safety Agency Directorate General of Civil Aviation India Federal Aviation Administration United States Civil Aviation Authority of New Zealand Transport Canada 1 National procedures editUnited States edit The FAA issues ADs by three different processes 5 Standard AD process Notice of Proposed Rulemaking NPRM followed by a Final Rule Final Rule and Request for Comments Emergency airworthiness directives issued without time for comment This is only used issued when an unsafe condition exists that requires immediate action by an owner operator to rapidly correct an urgent safety of flight situation 5 See also editAdvisory circular Aircraft maintenanceReferences edit a b c Transport Canada October 2008 Aeronautical Information Manual LRA 2 0 Aircraft Airworthiness Airworthiness Directives Archived from the original on 17 April 2011 Retrieved 3 November 2008 a b Transport Canada January 2008 Canadian Aviation Regulation 605 84 Aircraft Maintenance General Archived from the original on 7 December 2008 Retrieved 3 November 2008 a b c d Transport Canada January 2008 Canadian Aviation Regulation Standard 593 02 Airwothiness Directives Archived from the original on 18 May 2013 Retrieved 3 November 2008 Pilot s Handbook of Aeronautical Knowledge US Department of Transportations Federal Aviation Administration 2016 pp 9 12 a b Federal Aviation Administration October 2009 Types of Airworthiness Directives Archived from the original on 16 October 2009 Retrieved 4 October 2009 External links editFAA Airworthiness Directives Archived 15 May 2021 at the Wayback Machine EASA Airworthiness Directives CASA Airworthiness Directives Transport Canada Continuing Airworthiness Web Information System CAWIS CAA Airworthiness Directives Retrieved from https en wikipedia org w index php title Airworthiness Directive amp oldid 1194758458, wikipedia, wiki, book, books, library,
