{"id":"F2006B06295","name":"AD/PMC/40 - Blade Counterweight Bolt Replacement","slug":"ad-pmc-40-blade-counterweight-bolt-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47381,"registerId":"commonwealth-F2006B06295-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PMC/40 - Blade Counterweight Bolt Replacement","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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propellers - Variable Pitch - McCauley\n\n \n\nAD/PMC/40 Blade Counterweight Bolt Replacement 12/87 DM\n\nApplicability: All model 4HFR34C652, 4HFR34C754 and 4HFR34C755 Propellers.\n\n \n\nNote: Propeller S/No’s affected are contained in Table 1 of Requirement document.\n\n \n\nRequirement: Action in accordance with McCauley Service Bulletin No 166A.\n\n \n\nCompliance: At next issue of Maintenance Release or within 50 hours time in service after 14 September 1987 whichever occurs first.\n\n \n\nBackground:  The manufacturer advised of corrosion being found on the black oxide counter weight bolts. Corroded bolts can crack, so replacement of these bolts with a new part number item is required.\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":1287},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains a narrow, targeted safety intervention addressing a specific hardware defect (corroding counterweight bolts) in identified propeller models. It has not expanded beyond its original technical scope."},"complexity_factors":["Single mechanical requirement limited to three specific propeller models","Simple dual-path compliance deadline (next maintenance OR 50 hours)","Only one external technical reference (Service Bulletin No 166A)","No nested exceptions or conditional sub-clauses"],"plain_english_summary":"This Airworthiness Directive requires operators of aircraft fitted with McCauley propellers (models 4HFR34C652, 4HFR34C754, 4HFR34C755; affected serials per the service bulletin) to replace blade counterweight bolts because original black oxide bolts can corrode and crack, risking propeller or engine failure.\n\nCompliance follows McCauley Service Bulletin No.166A — replacement at the next maintenance release or within 50 flight hours after 14 Sep 1987, whichever comes first."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pmc-40-blade-counterweight-bolt-replacement","history":"/api/acts/ad-pmc-40-blade-counterweight-bolt-replacement/history","analysis":"/api/acts/ad-pmc-40-blade-counterweight-bolt-replacement/analysis","conflicts":"/api/acts/ad-pmc-40-blade-counterweight-bolt-replacement/conflicts","importantCases":"/api/acts/ad-pmc-40-blade-counterweight-bolt-replacement/important-cases","documents":"/api/acts/ad-pmc-40-blade-counterweight-bolt-replacement/documents"}}