{"id":"F2008L04018","name":"AD/DHA-3/7 - Horizontal Tail Plane Attachments - Modification - CANCELLED","slug":"ad-dha-3-7-horizontal-tail-plane-attachments-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75838,"registerId":"commonwealth-F2008L04018-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"DHA-3 (Drover) Series Aeroplanes","sectionType":"division","heading":"DHA-3 (Drover) Series Aeroplanes","content":"### DHA-3 (Drover) Series Aeroplanes\n\n| AD/DHA-3/7 | Horizontal Tail PlaneAttachments - Modification | 12/2008 |\n| ---------- | ----------------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                     |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 20 November 2008.                                                                                                                                                                                                                                                                                      |\n| Background:  | This AD was raised in 1954 against De Havilland TNS CT(A3) No. 86, requiring DH modification DRO.80 to be embodied to introduce strengthened tailplane forward attachment brackets in the fuselage. Compliance was required forthwith.As all affected aircraft would have been modified by now, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n8 October 2008","sortOrder":0},{"sectionNumber":"AD/DHA-3/7","sectionType":"part","heading":"AD/DHA-3/7","content":"## AD/DHA-3/7","sortOrder":1},{"sectionNumber":"Horizontal Tail PlaneAttachments - Modif","sectionType":"part","heading":"Horizontal Tail PlaneAttachments - Modification","content":"## Horizontal Tail Plane  \nAttachments - Modification","sortOrder":2},{"sectionNumber":"12/2008","sectionType":"part","heading":"12/2008","content":"## 12/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2424},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The cancellation represents the natural completion of the original legislative purpose. The 1954 directive was designed to ensure tailplane modifications were completed fleet-wide; once universal compliance was achieved, cancellation preserves the original safety scope without expansion or deviation."},"complexity_factors":["Single operative provision (cancellation) with no conditional logic or exceptions","Extremely brief—contains fewer than 100 words of substantive regulatory text","No definitions section, interpretation clauses, or cross-references to other legislation","Minimal technical complexity; refers to historical engineering documents only by reference number without incorporating their content"],"plain_english_summary":"This instrument cancels the 1954 Airworthiness Directive that required installation of reinforced tailplane attachment brackets (mod DRO.80) on De Havilland DHA‑3 Drover aircraft, effective 20 November 2008. CASA says the modification has been fitted to affected aircraft, so the directive is now obsolete; owners and operators (largely museums and collectors) no longer need to comply."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dha-3-7-horizontal-tail-plane-attachments-modification-cancelled","history":"/api/acts/ad-dha-3-7-horizontal-tail-plane-attachments-modification-cancelled/history","analysis":"/api/acts/ad-dha-3-7-horizontal-tail-plane-attachments-modification-cancelled/analysis","conflicts":"/api/acts/ad-dha-3-7-horizontal-tail-plane-attachments-modification-cancelled/conflicts","importantCases":"/api/acts/ad-dha-3-7-horizontal-tail-plane-attachments-modification-cancelled/important-cases","documents":"/api/acts/ad-dha-3-7-horizontal-tail-plane-attachments-modification-cancelled/documents"}}