{"id":"F2009L02816","name":"AD/BUSHBY M2/1 - Canopy Frame - Modification - CANCELLED","slug":"ad-bushby-m2-1-canopy-frame-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80066,"registerId":"commonwealth-F2009L02816-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bushby Mustang II Series Aeroplanes","sectionType":"division","heading":"Bushby Mustang II Series Aeroplanes","content":"### Bushby Mustang II Series Aeroplanes\n\n| AD/BUSHBY M2/1 | Canopy Frame - Modification | 8/2009 |\n| -------------- | --------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                           |\n| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 30 July 2009.                                                                                                                                                                                                                                                                                |\n| Background:  | This AD, raised in1985 against Bushby Mustang II Canopy Frame Revision Instruction dated 11 January 1984, required a modification to prevent canopy detachment in-flight. Compliance was required prior to 31 August 1985.As all affected aircraft would have been modified long ago, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n18 June 2009","sortOrder":0},{"sectionNumber":"AD/BUSHBY M2/1","sectionType":"part","heading":"AD/BUSHBY M2/1","content":"## AD/BUSHBY M2/1","sortOrder":1},{"sectionNumber":"Canopy Frame - Modification","sectionType":"part","heading":"Canopy Frame - Modification","content":"## Canopy Frame - Modification","sortOrder":2},{"sectionNumber":"8/2009","sectionType":"part","heading":"8/2009","content":"## 8/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2277},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument represents the natural expiration of an airworthiness directive rather than a change in scope. The original directive achieved its safety purpose (ensuring canopy modifications were completed by 1985), and this cancellation merely recognises that the requirement is now spent."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references to other legislation","Extremely short operative text (under 50 words)","Self-executing with no compliance steps or implementation requirements"],"plain_english_summary":"**What this does:** This instrument cancels an old aviation safety rule (called an **Airworthiness Directive**) that required structural modifications to the canopy frames of Bushby Mustang II light aircraft.\n\n**The backstory:** In 1985, the aviation regulator required owners to modify these aircraft to stop the cockpit canopy from detaching during flight—a serious safety hazard that could kill the pilot. Owners had to complete the fix by August 1985.\n\n**Why cancel it now:** More than 20 years have passed since that deadline. Every affected aircraft was modified decades ago, so the rule is completely obsolete. This cancellation simply removes the spent regulation from the books. **No action is required**—if you own one of these planes, the modification should already be done."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bushby-m2-1-canopy-frame-modification-cancelled","history":"/api/acts/ad-bushby-m2-1-canopy-frame-modification-cancelled/history","analysis":"/api/acts/ad-bushby-m2-1-canopy-frame-modification-cancelled/analysis","conflicts":"/api/acts/ad-bushby-m2-1-canopy-frame-modification-cancelled/conflicts","importantCases":"/api/acts/ad-bushby-m2-1-canopy-frame-modification-cancelled/important-cases","documents":"/api/acts/ad-bushby-m2-1-canopy-frame-modification-cancelled/documents"}}