{"id":"F2008L03624","name":"AD/DHC-1/2 - Engine Mount Pick-Up Points - Modification - CANCELLED","slug":"ad-dhc-1-2-engine-mount-pick-up-points-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75273,"registerId":"commonwealth-F2008L03624-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"De Havilland DHC-1 (Chipmunk) Series Aer","sectionType":"division","heading":"De Havilland DHC-1 (Chipmunk) Series Aeroplanes","content":"### De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n| AD/DHC-1/2 | Engine Mount Pick-Up Points - Modification | 11/2008 |\n| ---------- | ------------------------------------------ | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                  |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 23 October 2008.                                                                                                                                                                                                                                                    |\n| Background:  | This unique Australian AD, raised in 1952 against De Havilland Technical News Sheet (TNS) CT(CI) No. 63, required a modification to engine mount pick-up points. 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 September 2008","sortOrder":0},{"sectionNumber":"AD/DHC-1/2","sectionType":"part","heading":"AD/DHC-1/2","content":"## AD/DHC-1/2","sortOrder":1},{"sectionNumber":"Engine Mount Pick-Up Points - Modificati","sectionType":"part","heading":"Engine Mount Pick-Up Points - Modification","content":"## Engine Mount Pick-Up Points - Modification","sortOrder":2},{"sectionNumber":"11/2008","sectionType":"part","heading":"11/2008","content":"## 11/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1745},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a termination instrument. It does not expand the scope of the original legislation but rather ends its legal effect entirely because its purpose (ensuring all aircraft were modified) has been fulfilled."},"complexity_factors":["Single operative word: 'CANCELLED'","No defined terms or interpretation section","No conditional logic, exceptions, or procedural steps","Consists solely of a cancellation date and brief historical background"],"plain_english_summary":"**What this document does**\n\nThis officially cancels a 1952 aircraft safety directive (called an Airworthiness Directive or AD) that applied to De Havilland DHC-1 Chipmunk aeroplanes.\n\n**What the old rule required**\n\nThe original 1952 directive required owners to modify the **engine mount pick-up points** (the structural fittings where the engine attaches to the airframe) on these vintage military trainer aircraft. This was to address a safety issue identified by the manufacturer.\n\n**Why it was cancelled**\n\nThe directive was cancelled on 23 October 2008 because all affected aircraft would have been modified decades ago. The safety work is now complete, so the legal requirement is no longer needed.\n\n**What this means for aircraft owners**\n\nIf you own a De Havilland Chipmunk, you no longer need to check or comply with this specific directive (though you must still follow all other applicable safety rules)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-2-engine-mount-pick-up-points-modification-cancelled","history":"/api/acts/ad-dhc-1-2-engine-mount-pick-up-points-modification-cancelled/history","analysis":"/api/acts/ad-dhc-1-2-engine-mount-pick-up-points-modification-cancelled/analysis","conflicts":"/api/acts/ad-dhc-1-2-engine-mount-pick-up-points-modification-cancelled/conflicts","importantCases":"/api/acts/ad-dhc-1-2-engine-mount-pick-up-points-modification-cancelled/important-cases","documents":"/api/acts/ad-dhc-1-2-engine-mount-pick-up-points-modification-cancelled/documents"}}