{"id":"F2006B09013","name":"AD/DHC-1/32 Amdt 2 - Fuselage Rear Bulkhead","slug":"ad-dhc-1-32-amdt-2-fuselage-rear-bulkhead","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52677,"registerId":"commonwealth-F2006B09013-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/32 Amdt 2 - Fuselage Rear Bulkhead","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)  De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n \n\n# AD/DHC-1/32\n\nAmdt 2\n\nApplicability: All models.\n\n# Fuselage Rear Bulkhead 3/92\n\n \n\nRequirement:  Inspect the fuselage rear bulkhead, reinforcing plates and forward angle fittings in the area of the tailplane fittings in accordance with British Aerospace TNS No 183, Issue 4, dated 15 May 1991.\n\n \n\nNote: Transport Canada AD CF-91-38 and UK CAA AD 005-05-90 refer.\n\n \n\nCompliance: Unless already accomplished in accordance with a previous issue of this Directive, inspect:\n\n \n\nBefore further flight for the purposes of aerobatics or glider towing; Within 10 flight hours after 6 March 1992 for other flying.\n\nThereafter inspect as specified in British Aerospace TNS 183 Para 4 (7).\n\n \n\nNote: The Compliance date of the original issue of this Directive was 16 May 1990.\n\n \n\nBackground: Cracking of the fuselage rear bulkhead has been found in service. In most cases the reinforcing plates and forward angle fittings have also been found cracked. This amendment references Issue 4 of the Requirement document and adds a reference to the Transport Canada AD.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: addressing fuselage rear bulkhead cracking in Chipmunk aircraft. The changes from previous issues are minor administrative updates (referencing Issue 4 of the technical standard rather than earlier issues, and adding references to equivalent Canadian and UK directives). The core safety requirement and affected aircraft population remain unchanged."},"complexity_factors":["Single, clearly defined applicability (all DHC-1 Chipmunk models)","One primary technical requirement referencing an external standard (British Aerospace TNS No 183)","Simple conditional compliance structure with two clear pathways (aerobatics/towing vs other flying)","Minimal defined terms (no interpretation section)","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Straightforward background explanation without nested exceptions"],"plain_english_summary":"This CASA Airworthiness Directive applies to all De Havilland DHC‑1 Chipmunk aircraft and requires inspection of the rear fuselage bulkhead (and associated reinforcing plates/angles) per British Aerospace TNS No 183, Issue 4, because service cracks have been found that could affect structural integrity.\n\nInspections are required immediately before any further aerobatic flying or glider towing, within 10 flight hours for other operations, and thereafter at the recurring intervals in the referenced TNS. Amendment 2 updates the technical reference and adds equivalent foreign notices."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment updates the Requirement reference to British Aerospace TNS No 183 Issue 4 and adds a reference to the Transport Canada AD (Background). It does not expand applicability (still 'All models') but modifies the normative inspection document and cross-references, so procedural requirements and referenced guidance changed rather than the population subject to the AD."},"complexity_factors":["External-norm dependency: requires following British Aerospace TNS No 183 Issue 4 (Requirement) rather than setting detailed methods in the AD.","Differentiated timing: immediate-before-flight for aerobatics/glider towing vs 10 flight hours for other operations (Compliance).","Ongoing inspection schedule is set by an external paragraph (TNS 183 Para 4(7)), creating operational record-keeping and interval-management obligations.","Cross-references to foreign ADs (Transport Canada, UK CAA) increase the sources operators must check (Note; Background).","Potential for follow-on work: inspections may reveal cracking requiring repairs, affecting cost and aircraft downtime (Background)."],"plain_english_summary":"This AD requires owners/operators of all De Havilland DHC-1 (Chipmunk) aeroplanes to inspect the fuselage rear bulkhead, reinforcing plates and forward angle fittings around the tailplane in accordance with British Aerospace TNS No 183, Issue 4 (Requirement). Inspections must be done before further flight for aerobatics or glider towing, or within 10 flight hours after 6 March 1992 for other flying, then at intervals set in TNS 183 Para 4(7); owners/operators bear inspection and repair costs and must comply with CASA's directive (Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-32-amdt-2-fuselage-rear-bulkhead","history":"/api/acts/ad-dhc-1-32-amdt-2-fuselage-rear-bulkhead/history","analysis":"/api/acts/ad-dhc-1-32-amdt-2-fuselage-rear-bulkhead/analysis","conflicts":"/api/acts/ad-dhc-1-32-amdt-2-fuselage-rear-bulkhead/conflicts","importantCases":"/api/acts/ad-dhc-1-32-amdt-2-fuselage-rear-bulkhead/important-cases","documents":"/api/acts/ad-dhc-1-32-amdt-2-fuselage-rear-bulkhead/documents"}}