{"id":"F2006B06279","name":"AD/PMC/18 Amdt 1 - Propeller Hub - Modification or Replacement","slug":"ad-pmc-18-amdt-1-propeller-hub-modification-or-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47328,"registerId":"commonwealth-F2006B06279-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PMC/18 Amdt 1 - Propeller Hub - Modification or Replacement","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPropellers \\- Variable Pitch \\- McCauley\n\nAD/PMC/18\n\nAmdt 1\n\n  \nPropeller Hub \\- Modification or Replacement 2/71\n\nApplicability: Models 2D34C8 and 2D34C8-A, \\-J and \\-K; 2D34C53 and 2D34C53-A, B2D34C53-J and -K; 2D34CT69 and B2D34CT69-J and -K.\n\nRequirement: For models 2D34C8, 2D34C8-A, \\-J and \\-K modify the hub by shot peening the blade retention threads in accordance with SB No. 88 or fit a replacement hub model 2D34C8-M or subsequent.\n\nFor models 2D34C53, 2D34C53-A, B3D34C53-J and B2D34C53-K, modify the hub by shot peening the blade retention threads in accordance with SB No. 88 or fit a replacement hub model 2D34C53-M or subsequent, or B2D34C53-M or subsequent.\n\nFor models 2D34CT69, B2D34CT69-J and -K, modify the hub by shot peening the blade retention threads in accordance with SB No. 88 or fit a replacement hub model 2D34CT69-M or subsequent, or B2D34CT69-M or subsequent.\n\nCompliance: For propellers that have completed 600 or more hours total time in service - within 100 hours time in service. For propellers that have completed less than 600 hours total time in service - before achieving 700 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1682},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original directive's scope focused on McCauley propeller hub safety. It updates specific model designations and compliance pathways without expanding beyond the original safety purpose of preventing blade retention failures."},"complexity_factors":["Technical aviation terminology requiring specialist knowledge (shot peening, blade retention threads, Service Bulletin references)","Multiple similar model numbers with subtle variations in replacement hub specifications","Conditional compliance timeframe based on accumulated flight hours (two different calculation methods)","Reference to external technical document (SB No. 88) not reproduced within the directive text"],"plain_english_summary":"This mandatory CASA safety order requires owners/operators of aircraft with specified McCauley variable‑pitch propeller hubs to either shot‑peen the blade‑retention threads per Service Bulletin No. 88 or replace the hub with the improved “‑M” (or later) design. Compliance depends on hours: address within 100 flight hours if already >600 hours, or before reaching 700 total hours if under 600. It prevents thread failure and possible blade separation, which could cause catastrophic aircraft loss."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pmc-18-amdt-1-propeller-hub-modification-or-replacement","history":"/api/acts/ad-pmc-18-amdt-1-propeller-hub-modification-or-replacement/history","analysis":"/api/acts/ad-pmc-18-amdt-1-propeller-hub-modification-or-replacement/analysis","conflicts":"/api/acts/ad-pmc-18-amdt-1-propeller-hub-modification-or-replacement/conflicts","importantCases":"/api/acts/ad-pmc-18-amdt-1-propeller-hub-modification-or-replacement/important-cases","documents":"/api/acts/ad-pmc-18-amdt-1-propeller-hub-modification-or-replacement/documents"}}