{"id":"F2006B10695","name":"AD/HU 369/33 Amdt 1 - Fuselage Structure, Forward Section - Modification","slug":"ad-hu-369-33-amdt-1-fuselage-structure-forward-section-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116654,"registerId":"commonwealth-F2006B10695-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/33 Amdt 1 - Fuselage Structure, Forward Section - Modification","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)  \nMcDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters\n\nAD/HU 369/33\n\nAmdt 1\n\n  \n\nFuselage Structure, Forward Section - Modification\n\n  \n6/80\n\nApplicability: All 500D model 369D with S/Nos. 0003D to 0339D, 0341 to 0385D, 0387D to 0401D, 0403D to 0406D, 0408D to 0417D, 0419D to 0429D, 0431D to 0434D,\n\n0436D to 0442D, 0444D to 0491D, 0493D to 0503D, 0505D to 0507D, 0509D,\n\n0510D, 0512D to 0519D, 0521D to 0552D, 0554D to 0568D, 0572D to 0590D,\n\n0594D to 0596D, 0599D to 0620D, 0622D to 0625D, 0627D to 0633D, 0635D,\n\n0636D, 0638D to 0645D, 0647D, 0649D.\n\nDocument: Hughes SIN No. DN-25.1.\n\nCompliance: At the next major or 1200 hourly inspection whichever occurs first.\n\nBackground: Overseas field reports indicate that cracking and/or damage has occurred in the area of the forward most attach nutplate assembly, for both LH and RH sides of the engine inlet fairing assemblies.\n\nThis Directive is raised in issue to extend applicability to additional serial numbered aircraft following a revision to the requirement document.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2099},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expands the original directive's scope to cover additional helicopter serial numbers not included in the original issue (6/80), following a revision to the manufacturer's requirement document (Hughes SIN No. DN-25.1)."},"complexity_factors":["Extensive serial number applicability list with multiple non-contiguous ranges (approximately 80 separate ranges)","Technical aviation terminology requiring specialized engineering knowledge (nutplate assemblies, engine inlet fairings, hourly inspection cycles)","External technical document reference (Hughes SIN DN-25.1) containing the actual modification instructions not reproduced in the directive","Amendment structure requiring cross-reference to original AD/HU 369/33 to fully understand the regulatory requirement"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Hughes 500D helicopters with the specified serial numbers to inspect and modify the forward fuselage where the engine inlet cover nutplates attach, in line with Hughes Service Information Notice DN‑25.1. Work must be done before the next major inspection or within 1,200 flight hours. The measure responds to overseas reports of cracking around those bolt holes that could cause structural failure and expands the original directive to cover additional aircraft after revised manufacturer guidance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-33-amdt-1-fuselage-structure-forward-section-modification","history":"/api/acts/ad-hu-369-33-amdt-1-fuselage-structure-forward-section-modification/history","analysis":"/api/acts/ad-hu-369-33-amdt-1-fuselage-structure-forward-section-modification/analysis","conflicts":"/api/acts/ad-hu-369-33-amdt-1-fuselage-structure-forward-section-modification/conflicts","importantCases":"/api/acts/ad-hu-369-33-amdt-1-fuselage-structure-forward-section-modification/important-cases","documents":"/api/acts/ad-hu-369-33-amdt-1-fuselage-structure-forward-section-modification/documents"}}