{"id":"F2008L04014","name":"AD/DHA-3/3 - Wing Engine Mount Cross Brace Tube - Modification - CANCELLED","slug":"ad-dha-3-3-wing-engine-mount-cross-brace-tube-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75830,"registerId":"commonwealth-F2008L04014-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"DHA-3 (Drover) Series Aeroplanes","sectionType":"division","heading":"DHA-3 (Drover) Series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-3/3 | Wing Engine Mount CrossBrace Tube - 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 1952 against De Havilland TNS CT(A3) No. 22, requiring DH modification DRO.24 to be carried out to prevent cracking of the cross brace at the bend in its end plate. 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-3/3","sectionType":"part","heading":"AD/DHA-3/3","content":"## AD/DHA-3/3","sortOrder":1},{"sectionNumber":"Wing Engine Mount CrossBrace Tube - Modi","sectionType":"part","heading":"Wing Engine Mount CrossBrace Tube - Modification","content":"## Wing Engine Mount Cross  \nBrace Tube - 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":1788},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument performs exactly the function intended: it formally cancels an obsolete Airworthiness Directive. The scope has not expanded or drifted from its original purpose of housekeeping and regulatory cleanup."},"complexity_factors":["Single operative provision (cancellation) with no conditional logic","No defined terms or interpretation section","No cross-references to other legislation or regulations","Background is purely historical narrative with no legal tests"],"plain_english_summary":"**What this is:** This document cancels an old aircraft safety rule (called an Airworthiness Directive) that applied to De Havilland DHA-3 Drover aeroplanes.\n\n**What the old rule required:** Back in 1952, the Civil Aviation Safety Authority ordered owners to carry out a specific modification (called \"DRO.24\") to strengthen a metal tube in the wing engine mount. This prevented cracks from forming at the bend where the tube connects to the end plate.\n\n**Why it's being cancelled:** The rule was emergency stuff back in 1952—planes had to be fixed immediately. By November 2008, every affected aircraft would have been modified decades ago, so the rule is now unnecessary. This is essentially housekeeping to remove outdated red tape.\n\n**Who this affects:** Pretty much nobody today. The DHA-3 Drover is a rare vintage aircraft (a 1950s Australian-built plane), and any still flying would have had this fix done years ago."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dha-3-3-wing-engine-mount-cross-brace-tube-modification-cancelled","history":"/api/acts/ad-dha-3-3-wing-engine-mount-cross-brace-tube-modification-cancelled/history","analysis":"/api/acts/ad-dha-3-3-wing-engine-mount-cross-brace-tube-modification-cancelled/analysis","conflicts":"/api/acts/ad-dha-3-3-wing-engine-mount-cross-brace-tube-modification-cancelled/conflicts","importantCases":"/api/acts/ad-dha-3-3-wing-engine-mount-cross-brace-tube-modification-cancelled/important-cases","documents":"/api/acts/ad-dha-3-3-wing-engine-mount-cross-brace-tube-modification-cancelled/documents"}}