CASA has repealed 18 structural fatigue airworthiness directives (ADs) unique to Australia, simplifying continuing airworthiness requirements for a range of ageing GA aircraft under 5700 kg.
The ADs imposed fatigue life limits that applied only in Australia and weren’t reflected in manufacturer requirements or State of Design ADs. After a policy review and public consultation earlier this year, CASA decided the requirements were no longer necessary. It says ageing aircraft risks can be managed effectively through existing continuing airworthiness obligations, manufacturer instructions and State of Design ADs.
The types covered by the review include the Beechcraft 55/61 and 90; Cessna 310, 320, 340 and 400 series; de Havilland DHC-2; Fuji FA-200 and FU-24; and Piper PA-23, PA-28, PA-31, PA-34 and PA-36.
The repeal doesn’t remove owners’ responsibilities. CASA says operators of affected aircraft should read its new continuing airworthiness guidance and review the manufacturer’s instructions for continued airworthiness (ICAs), State of Design ADs, and structural inspection requirements and life limits. They should then update maintenance programs where needed and document their assessments and decisions on service information.
For some types, that will mean reviewing manufacturer structural inspection programs such as Cessna’s Supplemental Inspection Documents (SIDs) and Beechcraft’s Structural Inspection and Repair Manuals (SIRM). Airworthiness limitations specified in a manufacturer’s ICA remain mandatory under CAO 100.5.
CASA says structural fatigue, corrosion and ageing aircraft issues remain significant safety concerns, and operators should review the new guidance as part of their next maintenance planning.
New Cessna 400-series AD
The review identified one type that needed further action. CASA has issued a new AD for Cessna 400-series aircraft covering wing lower spar cap inspection and modification, aligning Australian requirements with the FAA’s. The AD takes effect on 18 April 2027.
It recognises previously approved spar strap modifications and exempts aircraft that have already complied with the applicable SIDs. CASA expects most operators already meet the requirements, with only limited inspection or verification work likely.
Air transport direction
The repeal is backed by a new CASA continuing airworthiness management direction for ageing aircraft used in air transport operations. CASA states the direction doesn’t create a new safety standard. It clarifies how existing obligations apply, particularly for air transport operators not working under CASR Part 42.