{"id":"F2006B09009","name":"AD/DHC-1/29 Amdt 2 - Tailplane Attachment Fittings","slug":"ad-dhc-1-29-amdt-2-tailplane-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52668,"registerId":"commonwealth-F2006B09009-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/29 Amdt 2 - Tailplane Attachment Fittings","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/DHC-1/29 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nDe Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\nAD/DHC-1/29\n\nAmdt 2\n\n  \nTailplane Attachment Fittings 13/2003\n\nApplicability: All DHC-1 aircraft.\n\nRequirement: Action in accordance with British Aerospace Technical News Sheet CT (C1) No.176 Issue 2.\n\nNote: UK CAA AD 014-11-97 refers.\n\nCompliance: As specified in the Requirement document.\n\nThis Amendment becomes effective on 25 December 2003.\n\nBackground: The tailplane attachment fittings are lifed items, but in most cases the history of the installed fittings was not known. This Directive required an inspection within 3 months, then replacement of all fittings with C1.TP.313 fittings within 15 months. A TNS amendment dated 28 May 1986 increased the fitting life from 6240 hours to 9984 hours.\n\nAmendment 2 is issued to update the Requirement document to the current issue.\n\n![Signature of David Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 12 November 2003\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 3 December 2003.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment does not change the scope. It is a technical update to reference the current issue of an existing technical document. The original purpose — ensuring safe tailplane attachment fittings on DHC-1 aircraft — remains unchanged since the initial AD issuance."},"complexity_factors":["Very short document (1 page)","Only 4 operative sections: Applicability, Requirement, Compliance, and Background","Single cross-reference to external technical document (British Aerospace Technical News Sheet)","No defined terms section — relies on external aviation terminology","Simple linear structure with no conditional logic or exceptions","Amendment 2 is purely administrative (updating document reference), not substantive"],"plain_english_summary":"This Airworthiness Directive for De Havilland DHC-1 Chipmunk aircraft (effective 25 Dec 2003) revokes Amendment 1 and replaces it with Amendment 2. It requires owners/operators in Australia to follow the current British Aerospace Technical News Sheet on tailplane attachment fittings — lifed items with defined flying-hour limits. Amendment 2 updates the referenced document only; it does not impose new safety actions beyond following the latest instructions."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 2 updates the Requirement document to the current issue but does not change the AD's applicability or the core obligation to inspect and replace tailplane attachment fittings. The AD revokes Amdt 1 and reissues the same directive with an updated technical reference (Requirement; Applicability; Background)."},"complexity_factors":["Reference to an external technical document (British Aerospace Technical News Sheet CT (C1) No.176 Issue 2) for mandatory actions creates dependency on that document for compliance (Requirement).","Broad applicability to 'All DHC-1 aircraft' makes the directive affect many operators and fleets (Applicability).","Technical nature of required inspections and component replacement imposes specialised maintenance work and parts costs on owners/operators (Requirement; Background).","History and life-limit changes for the fittings (lifed items; previous life increased from 6240 to 9984 hours) introduce record-checking and traceability burdens where histories are unknown (Background).","Revocation of the prior amendment and reissue to update the Requirement document requires operators to confirm they are complying with the current issue, risking confusion during transition (first paragraph; Background)."],"plain_english_summary":"**What it does:** Requires owners/operators of all De Havilland DHC‑1 (Chipmunk) aeroplanes to inspect and, where necessary, replace tailplane attachment fittings by following British Aerospace Technical News Sheet CT (C1) No.176 Issue 2. The AD revokes the prior amendment and took effect 25 December 2003 (Applicability; Requirement; Compliance).  \n\n**Who pays and who decides:** Owners/operators fund inspections and replacements; the CASA delegate issues the AD and the TNS specifies the technical steps maintenance providers must follow (Requirement; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-29-amdt-2-tailplane-attachment-fittings","history":"/api/acts/ad-dhc-1-29-amdt-2-tailplane-attachment-fittings/history","analysis":"/api/acts/ad-dhc-1-29-amdt-2-tailplane-attachment-fittings/analysis","conflicts":"/api/acts/ad-dhc-1-29-amdt-2-tailplane-attachment-fittings/conflicts","importantCases":"/api/acts/ad-dhc-1-29-amdt-2-tailplane-attachment-fittings/important-cases","documents":"/api/acts/ad-dhc-1-29-amdt-2-tailplane-attachment-fittings/documents"}}