{"id":"F2006B06052","name":"AD/PAP/8 Amdt 1 - Propeller Time Controlled Inspections","slug":"ad-pap-8-amdt-1-propeller-time-controlled-inspections","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114450,"registerId":"commonwealth-F2006B06052-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PAP/8 Amdt 1 - Propeller Time Controlled Inspections","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 - Allison/Aeroproducts\n\n \n\nAD/PAP/8\n\nAmdt 1\n\n\nPropeller Time Controlled Inspections 1/75\n\n \n\nApplicability: All model A6441 FN-606 and 606A propellers. Document:  Allison CSL No. 140, Rev. 11.\n\nCompliance: As detailed in the requirement document except that calendar period for hubs and blades shall not exceed 55 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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a straightforward amendment (Amdt 1) to an existing Airworthiness Directive. It maintains the original scope — time-controlled inspections for specific propeller models — with a single modification to the compliance timeframe. There is no evidence of scope creep; it remains tightly focused on the original safety purpose."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","Single defined applicability (3 specific propeller models)","Single cross-reference to external technical document (Allison CSL No. 140, Rev. 11)","One simple modification to the external standard (55-month calendar limit replacing any longer period)","No nested conditions, exceptions, or defined terms section","Standard AD format with minimal procedural requirements"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for aircraft propellers.\n\n**What it does:** It requires owners and operators of specific Allison/Aeroproducts variable-pitch propellers (models A6441 FN-606 and 606A) to carry out time-controlled inspections. These are scheduled safety checks based on how long the propeller has been in service.\n\n**The key requirement:** While the inspections must follow the manufacturer's document (Allison CSL No. 140, Revision 11), there's a strict Australian limit added: **the hub and blades must be inspected at least every 55 months**, regardless of what the manufacturer's document says about longer periods.\n\n**Who it affects:** Anyone operating aircraft with these specific propeller models — typically owners, maintenance organisations, and operators of aircraft using Allison/Aeroproducts equipment.\n\n**Why it matters:** Propeller failures can be catastrophic. This directive prevents propellers from flying beyond safe time limits, ensuring critical components (hubs and blades) are inspected regularly to catch fatigue, corrosion, or wear before they cause accidents."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment imposes a specific maximum calendar interval for hubs and blades—no more than 55 months—overriding or constraining the inspection intervals otherwise described in the referenced requirement document. The AD therefore narrows or clarifies the timing scope of inspections by adding the 55-month ceiling to the external inspection requirements (Compliance; Document)."},"complexity_factors":["Narrow applicability limited to specific propeller models (A6441 FN-606 and 606A). (Applicability)","Primary substantive requirement is a single, clear calendar ceiling (55 months) for hubs and blades, which simplifies operational interpretation. (Compliance)","Dependence on an external document (Allison CSL No. 140, Rev. 11) for detailed inspection procedures increases implementation complexity and creates reliance on cross-document consistency. (Document)","Lack of detailed enforcement, exemption, or procedural text in the AD increases operational uncertainty about consequences and administrative steps. (Compliance)","Potential scheduling and logistical impacts for operators and maintenance providers due to the fixed calendar constraint, requiring administrative coordination. (Compliance)"],"plain_english_summary":"This AD mandates time‑controlled inspections for all A6441 FN‑606 and 606A variable‑pitch propellers following Allison CSL No. 140, Rev. 11, and adds a firm calendar ceiling: hubs and blades must be inspected at intervals no greater than 55 months. It affects owners/operators and maintenance organisations; owners bear inspection and any repair costs and must schedule maintenance to meet the 55‑month cap."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pap-8-amdt-1-propeller-time-controlled-inspections","history":"/api/acts/ad-pap-8-amdt-1-propeller-time-controlled-inspections/history","analysis":"/api/acts/ad-pap-8-amdt-1-propeller-time-controlled-inspections/analysis","conflicts":"/api/acts/ad-pap-8-amdt-1-propeller-time-controlled-inspections/conflicts","importantCases":"/api/acts/ad-pap-8-amdt-1-propeller-time-controlled-inspections/important-cases","documents":"/api/acts/ad-pap-8-amdt-1-propeller-time-controlled-inspections/documents"}}