{"id":"F2009L00123","name":"AD/ML-M4/4 - Engine Mount Rear Support Fittings - Modification - CANCELLED","slug":"ad-ml-m4-4-engine-mount-rear-support-fittings-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76546,"registerId":"commonwealth-F2009L00123-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Maule M-4 Series Aeroplanes","sectionType":"division","heading":"Maule M-4 Series Aeroplanes","content":"### Maule M-4 Series Aeroplanes\n\n| AD/ML-M4/4 | Engine Mount RearSupport Fittings - Modification | 2/2009 |\n| ---------- | ------------------------------------------------ | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                              |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 12 February 2009.                                                                                                                                                                                                                                                               |\n| Background:  | This unique Australian AD, issued in 1967, required modification of the rear engine mount tubes in accordance with Maule Service Letter No. 10 to prevent cracking of the engine mount. The AD compliance was forthwith. As all aircraft would have been modified by now, the AD is no longer required. |\n\n![](image.001.png)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n12 December 2008","sortOrder":0},{"sectionNumber":"AD/ML-M4/4","sectionType":"part","heading":"AD/ML-M4/4","content":"## AD/ML-M4/4","sortOrder":1},{"sectionNumber":"Engine Mount RearSupport Fittings - Modi","sectionType":"part","heading":"Engine Mount RearSupport Fittings - Modification","content":"## Engine Mount Rear  \nSupport Fittings - Modification","sortOrder":2},{"sectionNumber":"2/2009","sectionType":"part","heading":"2/2009","content":"## 2/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1229},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument does not alter or expand the scope of aviation safety regulation. It is a formal cancellation of an obsolete airworthiness directive that has fulfilled its original purpose. The directive required immediate compliance upon issuance in 1967, meaning all affected aircraft were modified decades ago. This is administrative housekeeping to remove a spent instrument from the register."},"complexity_factors":["Single operative provision (cancellation) with no conditional logic","No cross-references to other legislation","No defined terms or interpretation sections","Straightforward historical background only"],"plain_english_summary":"This directive formally cancels an old aircraft safety rule that required owners of Maule M-4 series aeroplanes to modify their rear engine mount fittings (the metal brackets that attach the engine to the airframe).\n\n**What the original rule did:** Issued in 1967, it required immediate modification of rear engine mount tubes according to the manufacturer's Service Letter No. 10 to prevent dangerous metal fatigue and cracking.\n\n**Why it's being cancelled:** Because compliance was required immediately ('forthwith') when first issued over 40 years ago, every affected aircraft would have been modified long ago. The Civil Aviation Safety Authority (CASA) is simply removing this obsolete rule from the books as a housekeeping measure.\n\n**Who this affects:** Owners and operators of Maule M-4 series aircraft — though they would have completed this modification decades ago."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ml-m4-4-engine-mount-rear-support-fittings-modification-cancelled","history":"/api/acts/ad-ml-m4-4-engine-mount-rear-support-fittings-modification-cancelled/history","analysis":"/api/acts/ad-ml-m4-4-engine-mount-rear-support-fittings-modification-cancelled/analysis","conflicts":"/api/acts/ad-ml-m4-4-engine-mount-rear-support-fittings-modification-cancelled/conflicts","importantCases":"/api/acts/ad-ml-m4-4-engine-mount-rear-support-fittings-modification-cancelled/important-cases","documents":"/api/acts/ad-ml-m4-4-engine-mount-rear-support-fittings-modification-cancelled/documents"}}