{"id":"F2006B04923","name":"AD/CESSNA 150/25 - Engine to Mount Attachment","slug":"ad-cessna-150-25-engine-to-mount-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44768,"registerId":"commonwealth-F2006B04923-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/25 - Engine to Mount 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)  Cessna 150, F150, 152 & F152 Series Aeroplanes\n\n \n\nAD/CESSNA 150/25 Engine to Mount Attachment 5/76\n\nApplicability: All Reims models 150 with S/Nos. FRA1500121 to 0269, FRA1500273 to 0276, FRA1500278 and FRA1500279.\n\n \n\nRequirement: Action in accordance with Cessna SL SE76-2. Compliance:  Within 200 hours time in service after 31 May 1976.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1173},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original precise scope—a targeted safety fix for specific Reims-built aircraft regarding engine mount integrity. It has not expanded beyond its original technical maintenance purpose."},"complexity_factors":["Extremely narrow applicability limited to specific aircraft serial numbers","Single requirement referencing an external technical document (Cessna Service Letter SE76-2)","No conditional logic, exceptions, or nested provisions","Clear, absolute compliance deadline","Minimal regulatory text (approximately 100 words)"],"plain_english_summary":"This is a mandatory safety directive requiring owners of specific Cessna 150 aircraft to inspect and repair how the engine attaches to the plane's frame.\n\n**Who it affects:**\nOwners of specific Reims-manufactured Cessna 150 planes with these serial numbers:\n- FRA1500121 through FRA1500269\n- FRA1500273 through FRA1500276  \n- FRA1500278 and FRA1500279\n\n**What you must do:**\nFollow the instructions in **Cessna Service Letter SE76-2** to check and fix the engine-to-mount attachment points.\n\n**Deadline:**\nComplete the work within 200 hours of flight time after 31 May 1976.\n\n**Why it matters:**\nLoose or failing engine mounts can cause the engine to separate from the airframe during flight, which is catastrophic."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-25-engine-to-mount-attachment","history":"/api/acts/ad-cessna-150-25-engine-to-mount-attachment/history","analysis":"/api/acts/ad-cessna-150-25-engine-to-mount-attachment/analysis","conflicts":"/api/acts/ad-cessna-150-25-engine-to-mount-attachment/conflicts","importantCases":"/api/acts/ad-cessna-150-25-engine-to-mount-attachment/important-cases","documents":"/api/acts/ad-cessna-150-25-engine-to-mount-attachment/documents"}}