{"id":"F2006B06294","name":"AD/PMC/39 - Propeller Blade Replacement","slug":"ad-pmc-39-propeller-blade-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47378,"registerId":"commonwealth-F2006B06294-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PMC/39 - Propeller Blade 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/39 Propeller Blade Replacement 7/87\n\nApplicability: Propeller model B2A34C205/90DHA-4 with Blade S/Nos DA001 to DA040.\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 164.\n\n \n\nCompliance: Before 1250 hours total time in service or 31 November 1988 whichever occurs first.\n\n \n\nBackground: The manufacturer believes a number of blades were manufactured in 1983 without shot peening. It is necessary that these blades be retired from service.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2011},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains precisely targeted at its original scope: remedying a specific manufacturing defect in a limited batch of propeller blades produced in 1983. It has not expanded beyond this narrow safety-specific purpose."},"complexity_factors":["Extremely brief document (under 150 words) containing a single operative requirement","No definitions section, interpretation clauses, or legislative cross-references","Applicability limited to one specific propeller model and discrete serial number range","Simple compliance trigger using 'whichever occurs first' logic","Single external reference to technical standard (McCauley Service Bulletin No 164)"],"plain_english_summary":"**What this is:** A mandatory safety order (an Airworthiness Directive) issued by the Civil Aviation Safety Authority requiring specific aircraft propeller blades to be replaced.\n\n**Who it affects:** Owners or operators of aircraft fitted with McCauley propeller model **B2A34C205/90DHA-4** bearing blade serial numbers **DA001 to DA040**.\n\n**What you must do:** Replace the affected blades following the instructions in **McCauley Service Bulletin No. 164**.\n\n**Why:** Blades manufactured in 1983 were produced without \"shot peening\" — a manufacturing process that strengthens metal by blasting it with small particles. Without this treatment, blades could develop dangerous weaknesses.\n\n**Deadline:** You must complete the replacement before the propeller accumulates **1,250 total flight hours** **or** before **31 November 1988** (likely a typographical error for 30 November), whichever comes first."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pmc-39-propeller-blade-replacement","history":"/api/acts/ad-pmc-39-propeller-blade-replacement/history","analysis":"/api/acts/ad-pmc-39-propeller-blade-replacement/analysis","conflicts":"/api/acts/ad-pmc-39-propeller-blade-replacement/conflicts","importantCases":"/api/acts/ad-pmc-39-propeller-blade-replacement/important-cases","documents":"/api/acts/ad-pmc-39-propeller-blade-replacement/documents"}}