{"id":"F2006B04692","name":"AD/BELL 47/62 Amdt 2 - Centre Fuselage Frame Assembly","slug":"ad-bell-47-62-amdt-2-centre-fuselage-frame-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44444,"registerId":"commonwealth-F2006B04692-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 47/62 Amdt 2 - Centre Fuselage Frame 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)  \nBell Helicopter Textron 47 (All Variants) Series Helicopters\n\nAD/BELL 47/62\n\nAmdt 2\n\n  \nCentre Fuselage Frame Assembly 5/87\n\nApplicability: All model 47D, 47G and 47J Series.\n\nRequirement: Inspect the following fuselage frame assembly tubes for internal corrosion using radiographic technique, DCA/NDI/R/3A or other technique approved by the Secretary:\n\n    (a) Sections of the three main side tube LH and RH which meet at the engine basket pick-up junction, top and bottom.\n\n    (b) The centre of the lower longerons LH and RH.\n\n    (c) A section of the upper longeron LH and RH, adjacent to the engine pick-up basket.\n\n    (d) For “D” and “G” models inspect the tubes described in (a), (n) and (c) plus the first cross tube in the tail boom structure and the forward ends of the upper tail boom longerons LH & RH.\n\nNote: The length of the tube inspected at each location should be not less than 25.4 cm (10 inches). Where a tube is found to contain corrosion, the entire length of that tube and sample lengths of adjacent tubes must be inspected to ascertain the extent of the corrosion.\n\nCompliance: Unless already accomplished in accordance with earlier issues of this Directive, within 5 years from date of manufacture and thereafter at intervals not exceeding six years.\n\nBackground: A survey of radiographic results and defect reports has indicated that the tube corrosion problem is well under control and therefore the periodicity of the inspection may be relaxed.","sortOrder":0}],"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":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the airworthiness directive. The amendment number (Amdt 2) indicates this is a revision that relaxes inspection intervals based on operational data, but does not expand the directive's coverage to new aircraft types, new structural areas, or new operational requirements. The scope remains focused on corrosion inspection of centre fuselage frame assemblies in Bell 47 series helicopters."},"complexity_factors":["Short, single-purpose directive with clear applicability (3 specific model series)","Straightforward inspection list with 4 main items plus 1 conditional item for D/G models","Single defined technical term ('radiographic technique') with reference to standard DCA/NDI/R/3A","Simple compliance timeline (5 years initial, 6 years recurring)","No nested exceptions or complex conditional logic — only one model-specific variation","Background section provides clear rationale for the relaxed inspection interval","Total length: approximately 250 words"],"plain_english_summary":"This CASA airworthiness directive requires owners/operators of Bell 47D, 47G and 47J helicopters to perform mandatory internal corrosion inspections of the centre fuselage frame assembly (using radiography or CASA‑approved methods). First inspection is within five years of manufacture, then every six years.\n\nIt aims to detect hidden corrosion that could cause structural failure in flight; the rule relaxes earlier, stricter measures after data showed improved control but keeps periodic checks mandatory."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The Directive relaxes inspection periodicity compared with earlier issues: it requires an initial inspection within five years of manufacture and thereafter at intervals not exceeding six years. The Background explicitly states the inspection interval may be relaxed because radiographic surveys indicate corrosion is under control (Background; Compliance)."},"complexity_factors":["Technical non‑destructive inspection requirement: radiographic technique DCA/NDI/R/3A or other technique approved by the Secretary (Requirement).","Precise physical scope: defined fuselage tube locations and minimum inspected length of 25.4 cm (Note).","Follow-up scope: if corrosion is found the entire tube and sample lengths of adjacent tubes must be inspected to determine extent (Note).","Scheduling rules: initial compliance within 5 years of manufacture and recurring inspections at intervals not exceeding 6 years (Compliance).","Limited applicability: only Bell 47 models 47D, 47G and 47J (Applicability).","Regulatory discretion: Secretary may approve alternative techniques, creating an approval step for compliance (Requirement).","Operational compliance burden: requires access to radiography/NDI capability or outsourcing to certified NDI providers (implied by Requirement)."],"plain_english_summary":"This Directive requires owners/operators of Bell 47 (47D/47G/47J) helicopters to have specified centre-fuselage tubes inspected for internal corrosion by radiography or a Secretary‑approved alternative, and to extend inspection to adjacent tubes if corrosion is found. Compliance must begin within five years of manufacture and recur at intervals not exceeding six years; the Directive states the interval was relaxed because survey data show corrosion is under control. Operators or their maintenance/NDI providers pay for and arrange the inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-47-62-amdt-2-centre-fuselage-frame-assembly","history":"/api/acts/ad-bell-47-62-amdt-2-centre-fuselage-frame-assembly/history","analysis":"/api/acts/ad-bell-47-62-amdt-2-centre-fuselage-frame-assembly/analysis","conflicts":"/api/acts/ad-bell-47-62-amdt-2-centre-fuselage-frame-assembly/conflicts","importantCases":"/api/acts/ad-bell-47-62-amdt-2-centre-fuselage-frame-assembly/important-cases","documents":"/api/acts/ad-bell-47-62-amdt-2-centre-fuselage-frame-assembly/documents"}}