{"id":"F2022L00615","name":"AD/YA-1/4 Fuel Tank Bay - Modification","slug":"ad-ya-1-4-fuel-tank-bay-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":102422,"registerId":"commonwealth-F2022L00615-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-1/4 | Fuel Tank Bay - Modification | 8/2022 |\n| --------- | ---------------------------- | ------ |\n\n| Applicability: | All models of Yeoman Aircraft YA-1 250 and YA-1 250R aircraft.                                                                                                                                                                                                                               |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect and modify the fuel tank bay in accordance with the technical requirements of Yeoman Aircraft Service Bulletin YA1‑SB‑005 dated 13 July 1964, as in force on the commencement date of this AD.                                                                                       |\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-1/4","sectionType":"part","heading":"AD/YA-1/4","content":"## AD/YA-1/4","sortOrder":1},{"sectionNumber":"Fuel Tank Bay - Modification","sectionType":"part","heading":"Fuel Tank Bay - Modification","content":"## Fuel Tank Bay - Modification","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 applies only to the fuel tank bay modification for specific Yeoman aircraft models. The re-making under Part 39 of CASR 1998 is procedural (addressing lapse under the Legislation Act 2003) rather than an expansion of substantive requirements."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined term implicitly referenced (the Service Bulletin)","No cross-references to other legislation beyond the Civil Aviation Safety Regulations 1998","Simple conditional logic: single compliance deadline with one exception clause ('unless previously accomplished')","Single technical requirement referencing an external standard rather than embedding complex technical specifications"],"plain_english_summary":"This AD mandates that owners/operators of Yeoman YA‑1 250 and YA‑1 250R aircraft in Australia inspect and modify the fuel tank bay per Yeoman Service Bulletin YA1‑SB‑005 (July 1964). It was reissued after one aircraft returned to the register; the work must be completed within 90 days of 29 April 2022 to address fuel‑tank leak/fire risks before further flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD reinstates the prior requirement without expanding affected types or additional obligations: it mandates inspection/modification per Service Bulletin YA1‑SB‑005 'as in force' on commencement and sets a 90‑day compliance deadline. The re‑making reflects an administrative re‑issue because the type returned to the register after the original AD lapsed (Background; Requirement)."},"complexity_factors":["Narrow technical focus but mandatory action for affected owners/operators (Applicability; Requirement).","Primary compliance depends on an external historical technical document (Service Bulletin YA1‑SB‑005 dated 13 July 1964) which requires checking the version 'as in force' at commencement (Requirement).","Short mandatory compliance window (90 days from 29 April 2022) imposes scheduling and operational interruption costs (Compliance).","Re‑issuance under Part 39 due to prior lapse introduces administrative verification tasks for regulators and operators (Background).","Costs and operational decisions fall squarely on private owners/operators rather than the regulator (Requirement; Compliance)."],"plain_english_summary":"**What it does:** Requires owners/operators of all Yeoman Aircraft YA‑1 250 and YA‑1 250R aeroplanes to inspect and modify the fuel tank bay to meet Yeoman Aircraft Service Bulletin YA1‑SB‑005 (13 July 1964). Compliance is required within 90 days of 29 April 2022.\n\n**Who pays and who decides:** The aircraft owner/operator must arrange and pay for the work; the Civil Aviation Safety Authority (Delegate David Punshon) issued and re‑made the AD because an example returned to the Australian register and the prior AD had lapsed (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ya-1-4-fuel-tank-bay-modification","history":"/api/acts/ad-ya-1-4-fuel-tank-bay-modification/history","analysis":"/api/acts/ad-ya-1-4-fuel-tank-bay-modification/analysis","conflicts":"/api/acts/ad-ya-1-4-fuel-tank-bay-modification/conflicts","importantCases":"/api/acts/ad-ya-1-4-fuel-tank-bay-modification/important-cases","documents":"/api/acts/ad-ya-1-4-fuel-tank-bay-modification/documents"}}