{"id":"F2022L00612","name":"AD/YA-1/8 Wing Structural Fatigue Limitation","slug":"ad-ya-1-8-wing-structural-fatigue-limitation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":102420,"registerId":"commonwealth-F2022L00612-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Yeoman Aircraft YA-1 Series Aeroplanes","sectionType":"part","heading":"Yeoman Aircraft YA-1 Series Aeroplanes","content":"# Yeoman Aircraft YA-1 Series Aeroplanes\n\n| AD/YA-1/8 | Wing Structural Fatigue Limitation | 8/2022 |\n| --------- | ---------------------------------- | ------ |\n\n| Applicability: | All models of Yeoman Aircraft YA-1 series aircraft:a. with any of serial numbers 101 to 106 inclusive, certificated to a maximum agricultural gross weight of 3250 lbs and with wings exceeding 6500 hours’ time in service.b. with any of serial numbers 108 and subsequent certificated to a maximum agricultural gross weight of 3530 lbs and with wings exceeding 5500 hours’ time in service. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Retire wings from service.Note: These life limitations assume that the maximum agricultural gross weight is not exceeded. Operators are warned that overweight agricultural operations will have a marked adverse effect upon the fatigue life of the structure.                                                                                                                                   |\n| Compliance:    | Within 90 days after the commencement date of this AD, unless previously accomplished.                                                                                                                                                                                                                                                                                                             |\n|                | This AD commences on 29 April 2022.                                                                                                                                                                                                                                                                                                                                                                |\n| Background:    | This AD is being re-made under Part 39 of the Civil Aviation Safety Regulations 1998 because an example of the aircraft type, for which Australia is the State of Design, has returned to the Australian aircraft register and the AD had previously lapsed due to the Legislation Act 2003.                                                                                                       |\n\n![Text\nDescription automatically generated](image.001.jpeg)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n14 April 2022","sortOrder":0},{"sectionNumber":"AD/YA-1/8","sectionType":"part","heading":"AD/YA-1/8","content":"## AD/YA-1/8","sortOrder":1},{"sectionNumber":"Wing Structural Fatigue Limitation","sectionType":"part","heading":"Wing Structural Fatigue Limitation","content":"## Wing Structural Fatigue Limitation","sortOrder":2},{"sectionNumber":"8/2022","sectionType":"part","heading":"8/2022","content":"## 8/2022","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It is a straightforward safety directive re-issued to address a technical lapse in legislative continuity, not an expansion of regulatory reach."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability categories based on serial numbers and weight certifications","Single, unambiguous requirement: retire wings","No cross-references to other legislation beyond a brief mention of Civil Aviation Safety Regulations 1998 Part 39","Simple compliance deadline: 90 days from commencement","No nested exceptions or conditional logic — the applicability criteria are straightforward OR conditions"],"plain_english_summary":"This AD requires permanent retirement of the wing assemblies on certain Yeoman Aircraft YA-1 agricultural planes once they reach specified flight-hour limits tied to their certificated maximum weights, to prevent metal-fatigue failures. It affects owners/operators of the listed YA-1 serials and assumes compliance with weight limits, since overloading accelerates fatigue.\n\nThe directive was reissued after a prior expiry when a YA-1 returned to Australia’s register."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope has not been broadened or narrowed in substance: the AD is a re-issue to restore the previous requirement after lapse (Background). It continues to target YA-1 aircraft meeting the same serial-number, weight and hours-in-service criteria and retains the same life-limit caveat regarding maximum agricultural gross weight (Applicability; Requirement; Note)."},"complexity_factors":["Single clear mandatory action: 'Retire wings from service' (Requirement).","Applicability depends on a conjunction of serial-number ranges, certified maximum agricultural gross weight, and wings’ hours-in-service thresholds (Applicability).","Compliance deadline is short and fixed: within 90 days after commencement (Compliance).","Operational caveat: life-limits assume the maximum agricultural gross weight is not exceeded; overweight operations reduce fatigue life (Note in Requirement).","Legal re-issue mechanism: AD re-made under Part 39 because prior AD lapsed when an aircraft returned to the register (Background).","Administrative detail: fixed commencement date specified (AD commences on 29 April 2022)."],"plain_english_summary":"This Airworthiness Directive requires operators to retire wings on specified Yeoman Aircraft YA-1 series aeroplanes once those wings exceed specified hours-in-service, with the retirement to be completed within 90 days of the AD’s commencement. It affects owners/operators of YA-1s that meet the AD’s serial-number, weight and hours criteria and therefore imposes the direct cost and operational consequence of removing or replacing wings. The AD is re-made under Part 39 because an example returned to the Australian register and the prior AD had lapsed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ya-1-8-wing-structural-fatigue-limitation","history":"/api/acts/ad-ya-1-8-wing-structural-fatigue-limitation/history","analysis":"/api/acts/ad-ya-1-8-wing-structural-fatigue-limitation/analysis","conflicts":"/api/acts/ad-ya-1-8-wing-structural-fatigue-limitation/conflicts","importantCases":"/api/acts/ad-ya-1-8-wing-structural-fatigue-limitation/important-cases","documents":"/api/acts/ad-ya-1-8-wing-structural-fatigue-limitation/documents"}}