{"id":"F2006B10340","name":"AD/HELIO/1 Amdt 1 - Wing Centre Section Main Spar Carry Thru Assembly","slug":"ad-helio-1-amdt-1-wing-centre-section-main-spar-carry-thru-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56096,"registerId":"commonwealth-F2006B10340-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HELIO/1 Amdt 1 - Wing Centre Section Main Spar Carry Thru Assembly","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nHelio Courier Series Aeroplanes\n\nAD/HELIO/1\n\nAmdt 1\n\nApplicability: All models.\n\n  \n\nWing Centre Section Main Spar Carry Thru Assembly\n\n  \n1/87\n\nRequirement: 1. For aircraft incorporating wing main spar centre section carry thru assembly P/N 295-030-401, inspect the carry- thru assembly in accordance with Para B) of FAA AD 82-16-08.\n\n    2. Modify the wing centre section carry-thru assembly P/N 391-030-401 or 295-030- 401 as applicable, by installing a full span (wing joint to wing joint) fail safe reinforcement of the lower tube in accordance with a scheme approved by the Secretary. FAA STC’s SA 1590CE and SA 1728CE, respectively, are approved schemes.\n\n    3. After modification in accordance with 2 above, inspect the carry-thru assembly in accordance with Para D) of FAA AD 82-16-08.\n\nCompliance: For Para 1: At intervals not exceeding 100 hours time in service, until modified in\n\naccordance with Para 2.\n\nFor Para 2: For land planes \\- prior to exceeding 2000 hours time in service.\n\nFor float planes or aircraft which have at any time had floats installed - prior to exceeding 2000 hours equivalent land plane time in service. To convert float plane time to equivalent land plane time, multiply by two.\n\nFor Para 3: At intervals not exceeding 1500 hours time in service.\n\nBackground: Fatal accidents have occurred overseas as a result of fatigue failures of the wing spar carry-thru assembly lower tube or end fitting. This Directive combines the requirements of the previous AD/HELIO/1 and AD/HELIO/3 Amdt 1 but provides for fail safe reinforcement modification rather than retirement. Most importantly, it eliminates confusion over the “modification” aspect of those earlier AD’s; it was not clear that the modification referred to is the joint to joint straps across the full span of the lower tube, rather than the end reinforcement only (ie. the P/N 295-030-401 configuration).","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original safety purpose of preventing wing spar failures. It consolidates two previous directives and clarifies the modification requirements, but does not expand beyond the core airworthiness safety objective. The scope remains focused on the specific wing component and aircraft series."},"complexity_factors":["Multiple part numbers referenced (P/N 295-030-401, P/N 391-030-401) requiring cross-checking against aircraft records","Conditional compliance timelines based on aircraft configuration (land plane vs float plane) with conversion formula required","References to external FAA documents (AD 82-16-08, STCs SA 1590CE and SA 1728CE) that must be consulted for full requirements","Technical aviation terminology throughout (STC = Supplemental Type Certificate, P/N = Part Number, fail-safe, time in service)","Amendment structure that consolidates and replaces previous directives (AD/HELIO/1 and AD/HELIO/3 Amdt 1), requiring historical knowledge"],"plain_english_summary":"This safety directive for all Helio Courier owners/operators requires regular inspections of the carry‑thru wing assembly and a mandated full‑span reinforcement strap retrofit to make the structure fail‑safe, addressing fatal overseas wing failures from metal fatigue. It replaces earlier confusing guidance, distinguishes land‑plane vs. float use for compliance, and sets new inspection and modification timeframes so aircraft can remain serviceable rather than be retired."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The Directive changes prior treatment by allowing a full-span fail-safe reinforcement modification instead of mandatory retirement of the lower tube. It consolidates previous ADs and clarifies that the required modification is a joint‑to‑joint reinforcement, not only end fitting reinforcement, thereby altering the remedial option available to owners/operators."},"complexity_factors":["Technical engineering content: fatigue failure, fail-safe reinforcement and specific part numbers (P/N 295-030-401, 391-030-401)","Cross-reference to foreign regulatory material (FAA AD 82-16-08) for inspection procedures","Acceptance of FAA STCs (SA 1590CE, SA 1728CE) plus option for Secretary-approved schemes (administrative discretion)","Multiple, differing compliance intervals (100 hours periodic until modification; 2000 hours modification deadline; 1500 hours post-mod inspection)","Float-plane time conversion rule (multiply by two) introducing a non-standard time metric","Applies to all models but targets specific assemblies—interaction with legacy ADs (combines earlier ADs) may complicate compliance histories","Safety-critical consequences increase regulatory strictness and monitoring burden on operators"],"plain_english_summary":"**What this does:** This Airworthiness Directive requires owners/operators of Helio Courier aeroplanes with certain wing centre section main spar carry-thru assemblies to inspect those assemblies and, by a set service-hours deadline, install a full‑span fail‑safe reinforcement to the lower tube. FAA repair schemes are accepted as approved options.\n\n**Who pays and who decides:** Operators pay for inspections and work; the Secretary must approve modification schemes (FAA STCs named in the AD are accepted). Inspections continue on a scheduled basis until and after modification."}},"importantCases":[],"_links":{"self":"/api/acts/ad-helio-1-amdt-1-wing-centre-section-main-spar-carry-thru-assembly","history":"/api/acts/ad-helio-1-amdt-1-wing-centre-section-main-spar-carry-thru-assembly/history","analysis":"/api/acts/ad-helio-1-amdt-1-wing-centre-section-main-spar-carry-thru-assembly/analysis","conflicts":"/api/acts/ad-helio-1-amdt-1-wing-centre-section-main-spar-carry-thru-assembly/conflicts","importantCases":"/api/acts/ad-helio-1-amdt-1-wing-centre-section-main-spar-carry-thru-assembly/important-cases","documents":"/api/acts/ad-helio-1-amdt-1-wing-centre-section-main-spar-carry-thru-assembly/documents"}}