{"id":"F2006B09046","name":"AD/DHC-2/28 - Wing Strut Lower Steel End-Fitting","slug":"ad-dhc-2-28-wing-strut-lower-steel-end-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52763,"registerId":"commonwealth-F2006B09046-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-2/28 - Wing Strut Lower Steel End-Fitting","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  DHC-2 (Beaver) Series Aeroplanes\n\n \n\nAD/DHC-2/28 Wing Strut Lower Steel End-Fitting 12/93\n\nApplicability: Model DHC-2 aircraft with steel end-fittings on C2W1115-1/-2 wing struts. Requirement:               Visually inspect the wing strut in accordance with de Havilland Alert Service Bulletin\n\nNo. A2/48. If damage is detected, repair or replace the strut in accordance with the\n\nabove mentioned Service Bulletin.\n\n \n\nNote: Transport Canada AD CF-93-21 refers.\n\n \n\nCompliance: Within 50 hours time in service after 11 November 1993, and thereafter at intervals not to exceed 12 calendar months.\n\n \n\nBackground: Service difficulty reports received by Transport Canada indicated the occurrence of skin corrosion and fastener damage at the wing strut lower steel end-fittings.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD is narrowly focused on addressing reports of skin corrosion and fastener damage at the wing strut lower steel end‑fittings on the specified struts. The instrument's scope (affected aircraft, inspection requirement, remedial action) aligns with that stated purpose; the text contains no indication that the scope was expanded or altered from that intent."},"complexity_factors":["Narrow applicability: only DHC‑2 aircraft with steel end‑fittings on C2W1115‑1/-2 wing struts (simple target population).","Operational requirement is a basic visual inspection rather than complex testing (low technical complexity).","Mandates follow-up action (repair or replace) tied to an external document (de Havilland Alert Service Bulletin A2/48), creating a dependency on that bulletin for method and standards.","Fixed compliance timing: initial inspection within 50 hours after 11 Nov 1993 and recurrent inspections at intervals not to exceed 12 calendar months (administrative scheduling burden).","Potential cost and logistics of repairs or replacement if damage is found (financial and parts/maintenance availability considerations).","Cross-reference to Transport Canada AD CF-93-21 (international regulatory linkage may affect operators using foreign-sourced guidance)."],"plain_english_summary":"Requires owners/operators of de Havilland DHC‑2 aircraft fitted with steel lower end‑fittings on C2W1115‑1/‑2 wing struts to perform a visual inspection (per de Havilland Alert Service Bulletin A2/48) within 50 hours after 11 November 1993 and then at least annually. If corrosion or fastener damage is found, the strut must be repaired or replaced in accordance with that Service Bulletin. The directive responds to Transport Canada reports of skin corrosion and fastener damage; operators bear the inspection and repair costs and must adjust maintenance schedules to comply."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standalone Airworthiness Directive issued in 1993. It has not grown beyond its original purpose — it remains a targeted safety inspection requirement for a specific aircraft part. ADs are typically narrow, technical instruments and this fits that pattern precisely."},"complexity_factors":["Single, specific technical requirement (visual inspection per referenced Service Bulletin)","Only one applicability criterion (specific model with specific part numbers)","Simple compliance timeline (50 hours + 12-month recurring)","No defined terms section, no cross-references to other legislation beyond the Service Bulletin","Background explanation is straightforward (corrosion reports from Canada)","Document is essentially a one-page safety notice with standard AD format"],"plain_english_summary":"This CASA Airworthiness Directive legally requires owners/operators of de Havilland DHC-2 \"Beaver\" aircraft fitted with steel end‑fittings on C2W1115‑1 or C2W1115‑2 lower wing struts to inspect those end‑fittings for corrosion/damage, repair or replace if found, following de Havilland Alert SB A2/48. Initial inspection was mandated within 50 flight hours after 11 Nov 1993 and then every 12 months. Issued after reports of corrosion and fastener damage that could cause strut failure and wing collapse."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-2-28-wing-strut-lower-steel-end-fitting","history":"/api/acts/ad-dhc-2-28-wing-strut-lower-steel-end-fitting/history","analysis":"/api/acts/ad-dhc-2-28-wing-strut-lower-steel-end-fitting/analysis","conflicts":"/api/acts/ad-dhc-2-28-wing-strut-lower-steel-end-fitting/conflicts","importantCases":"/api/acts/ad-dhc-2-28-wing-strut-lower-steel-end-fitting/important-cases","documents":"/api/acts/ad-dhc-2-28-wing-strut-lower-steel-end-fitting/documents"}}