Explanatory Statement
Civil Aviation Regulations 1988
Revocation of Airworthiness Directives
Legislation
Under section 98 of the Civil Aviation Act 1988, the Governor-General may make regulations for the purposes of the Act and in the interests of the safety of air navigation. Under regulation 39.001 of the Civil Aviation Safety Regulations 1998, CASA may issue airworthiness directives (ADs) for kinds of aircraft or aeronautical products. Subregulation 39.001(5) of the Civil Aviation Safety Regulations 1998 provides that an AD is a disallowable instrument for the purposes of section 46A of the Acts Interpretation Act 1901. Therefore, in accordance with section 6 of the Legislative Instruments Act 2003, an AD is a legislative instrument.
Under Annex 8 to the Convention on International Civil Aviation, the State of Design has overall responsibility for continuing airworthiness of an aircraft type, and must provide any information necessary to ensure the continuing airworthiness of a type to appropriate States of Registry. ADs (and their equivalents) are the most common form of continuing airworthiness information, and are issued by most ICAO Contracting States.
The State of Registry of an individual aircraft is responsible for its continuing airworthiness. Under Annex 8, the State of Registry must develop or adopt requirements to ensure the continuing airworthiness of aircraft. When a State of Design issues an AD against a type of aircraft on the Australian Register, CASA, as Australia’s national airworthiness authority, must assess that information and, if appropriate, issue an Australian AD to mandate the requirements of the State of Design.
State of Design ADs issued on or after 1 October 2009 are defined as ADs per Civil Aviation Safety Regulations Part 39.001A.
AD/HS 125/9 Amdt 2
This AD was first raised in 1967 and amended in 1968 requiring repetitive tests and inspections for fuel or methanol leaks from fuel filter and windshield de-icing systems in accordance with Hawker Siddeley Aviation Service Bulletin (SB) 125-28-23 and 23A. The AD was again amended in 1973 against Hawker Siddeley Aviation Service Bulletin (SB) 125-28-56 enabling a modification to be incorporated to terminate the need for repetitive inspections.
As this AD has been promulgated for an extended period giving plenty of time for the modification to be incorporated, it is considered that this AD it is no longer required. This AD is therefore cancelled.
AD/HS 125/10 Amdt 1
This AD was raised in 1967 and amended in 1968 against Hawker Siddeley Service Bulletin (SB) 125-27-49 initially requiring an inspection, followed by a modification, to prevent the flap centre hinge bolt retaining nut becoming unlocked in service. Compliance was initially an inspection within 10 hours TIS followed by a modification before 1 July 1968.
As this AD has been promulgated over an extended period it is considered to be no longer required. This AD is therefore cancelled.
AD/HS 125/12
This unique Australian AD was raised in 1967 requiring installation of a gaiter on the control column to prevent ingress of foreign objects that could restrict travel of the control column. Compliance was required forthwith.
As this AD has been promulgated for an extended period it is considered to be no longer required. This AD is therefore cancelled.
AD/HS 125/13
This unique Australian AD was raised in 1967 requiring installation of a landing gear audible warning system. Compliance was required forthwith.
As this AD has been promulgated for an extended period it is considered to be no longer required. This AD is therefore cancelled.
AD/HS 125/14
This AD was raised in 1968 against Hawker Siddeley Service Bulletin (SB)
125-53-37 requiring repetitive inspection of the right hand nose leg mounting bracket. Installation of modification 25/2048 precluded further inspections. Inspection was required within 25 hours TIS and thereafter at intervals not exceeding 100 hours TIS.
As this AD has been promulgated for an extended period and the modification would have been actioned by now, it is considered to be no longer required. Therefore this AD is cancelled.
AD/HS 125/15
This AD was raised in 1969 against Hawker Siddeley Service Bulletin (SB) 27-30 requiring aircraft not modified to Mod. 257111 to have Flap Servo Part Nos AIR45566/2 and AIR45568/2 replaced following expiry of the manufacturer’s fatigue life. Compliance was required for aircraft Serial No. 25015 before 5600 landings and all other aircraft before 8000 landings.
As this AD has been promulgated for an extended period and the requirement will be established in an aircraft’s system of maintenance as a time-life item, it is considered to be no longer required. This AD is therefore cancelled.
AD/HS 125/120
This AD was raised in 1991 against British Aerospace Service Bulletin (SB) 27-155 requiring an NDT inspection of the rudder pedal torque tubes. Compliance was required at the earliest opportunity but not later than 29 February 1992, or at next Service ‘A’, whichever was the sooner.
As this AD requiring a one-time inspection has been promulgated for an extended period it is considered to be no longer required. This AD is therefore cancelled.
Consultation
No consultation with the Australian public has taken place on these AD cancellations. The Office of Best Practice Regulation has determined that ADs do not require a Regulatory Impact Statement.
The AD has been made by the Manager, Continuing Airworthiness in the Airworthiness and Engineering Branch, on behalf of CASA, in accordance with subsection 94 (1) of the Act.
[Instrument number CASA ADCX 007/10]