{"id":"F2006B02363","name":"AD/AMD 20/24 - Engine Cowl Attachment","slug":"ad-amd-20-24-engine-cowl-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41593,"registerId":"commonwealth-F2006B02363-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AMD 20/24 - Engine Cowl Attachment","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  AMD Fan Jet Falcon (Falcon 20/Mystere-Falcon 200) Series Aeroplanes\n\n \n\nAD/AMD 20/24 Engine Cowl Attachment 12/91\n\nApplicability: Mystere-Falcon 200 all serial numbers.\n\n \n\nRequirement: Inspect and modify the engine cowl attachments in accordance with the technical requirements of DGAC AD 91-197-018(B).\n\n \n\nCompliance: As specified in the Requirement Document with a revised effective date of 12 December 1991 for Australian registered aircraft.\n\n \n\nBackground: Instances of fatigue cracking have been reported in the engine cowl attachments. These defects could ultimately lead to in-flight loss of the small aprons and hinged cowls. The effective date of the DGAC AD is September 1991. This Directive permits compliance to be deferred two months.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1518},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an original airworthiness directive addressing a specific safety defect (fatigue cracking in engine cowl attachments). It has not expanded beyond its original purpose of mandating inspections and modifications to prevent in-flight loss of engine cowling components."},"complexity_factors":["Single straightforward requirement referring to an external technical document","No defined terms, interpretation sections, or conditional exceptions","Simple applicability clause limited to one specific aircraft model and all its serial numbers","Minimal cross-referencing (only to the French DGAC directive)"],"plain_english_summary":"This is a **safety order** (called an Airworthiness Directive) issued by Australia's aviation safety regulator for aircraft operators. It requires owners of specific French-made business jets (the **Mystere-Falcon 200** series) to **inspect and repair the engine covers** (cowls).\n\n**Why it matters:** Cracks have been discovered in the metal brackets that hold the engine cowls in place. These cracks are caused by **metal fatigue** (wear and tear from repeated stress). If not fixed, the engine covers could **fall off during flight**, creating serious hazards.\n\n**What must be done:** Aircraft mechanics must follow specific French aviation safety guidelines (technical document **DGAC AD 91-197-018(B)**) to inspect the attachment points and carry out any necessary modifications.\n\n**Deadline:** While the original French directive took effect in September 1991, Australian-registered aircraft were given until **12 December 1991** to complete the work—a two-month extension to allow time for scheduling maintenance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-20-24-engine-cowl-attachment","history":"/api/acts/ad-amd-20-24-engine-cowl-attachment/history","analysis":"/api/acts/ad-amd-20-24-engine-cowl-attachment/analysis","conflicts":"/api/acts/ad-amd-20-24-engine-cowl-attachment/conflicts","importantCases":"/api/acts/ad-amd-20-24-engine-cowl-attachment/important-cases","documents":"/api/acts/ad-amd-20-24-engine-cowl-attachment/documents"}}