{"id":"F2006B06309","name":"AD/PR/11 Amdt 1 - Blade Operating Pin - Inspection for Cracking","slug":"ad-pr-11-amdt-1-blade-operating-pin-inspection-for-cracking","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47426,"registerId":"commonwealth-F2006B06309-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PR/11 Amdt 1 - Blade Operating Pin - Inspection for Cracking","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 - Dowty Rotol\n\n \n\nAD/PR/11\n\nAmdt 1\n\n\nBlade Operating Pin - Inspection for Cracking NK\n\n \n\nApplicability: As detailed in the requirement document.\n\n \n\nDocument: 1. Dowty Rotol Alert SBs No. 61-A733 (Model (c) R175/4-30-4/13E and No. 61- A740 (Model (c) R193/4-30-4/50 and 61); and\n\n \n\n2. Dowty Rotol SB 61-711 Rev. 2 (All 4 bladed Nos. 20, 30 and 40 root size propellers fitted to RR Dart engined aircraft).\n\n \n\nCompliance: As detailed in the requirement document.\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 standard, narrow airworthiness directive focused on a specific safety-critical component (blade operating pins) on specific propeller models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","No defined terms section","Minimal conditional logic - straightforward applicability and compliance references","Relies entirely on external technical documents (service bulletins) for actual requirements","Single amendment (Amdt 1) with no nested amendments or complex versioning","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates safety inspections for specific aircraft propellers made by Dowty Rotol.\n\n**What it does:**\n- Requires operators to inspect the **blade operating pins** on certain variable-pitch propellers for **cracks** (cracking can lead to catastrophic failure).\n- Applies to specific propeller models fitted to Rolls-Royce Dart engine aircraft.\n\n**Who it affects:**\n- Owners and operators of aircraft with Dowty Rotol 4-bladed propellers (specific models listed in the referenced service bulletins).\n- Maintenance organisations servicing these propeller types.\n\n**Why it matters:**\n- Blade operating pins are critical components that allow propeller blades to change pitch (angle). If they crack and fail, the pilot could lose control of the propeller, potentially causing engine damage or loss of aircraft control.\n- This directive ensures potential defects are caught before they cause accidents.\n\n**How to comply:**\n- Follow the detailed inspection procedures in the referenced Dowty Rotol Service Bulletins (SB 61-A733, SB 61-A740, and SB 61-711 Rev. 2)."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The instrument is labelled as an amendment (\"Amdt 1\") but the supplied text does not state what, if any, changes were made compared with an earlier version. The AD text provided only sets the inspection requirement and points to the requirement document and specific Dowty Rotol service bulletins for applicability and compliance; it does not describe a change of scope within this excerpt."},"complexity_factors":["Delegates key technical details (inspection methods, intervals, corrective actions, affected serials) to an external \"requirement document\" rather than stating them in the AD text.","References multiple manufacturer service bulletins (Nos. 61-A733, 61-A740, 61-711 Rev. 2), requiring cross-referencing and access to several documents.","Technical subject matter (propeller blade operating pin cracking) requires specialised maintenance skills and judgement by certified personnel.","Compliance and applicability are unspecified in the AD itself, increasing administrative effort to determine exact obligations.","Enforcement and operational discretion split between the regulator (AD issuance) and maintenance organisations (implementation scheduling and execution).","Potential variability across affected propeller models/root sizes listed in the SBs creates heterogeneity in required actions for different operators."],"plain_english_summary":"This AD mandates inspection for cracking of the blade operating pin on certain Dowty Rotol variable‑pitch propellers, creating a regulatory obligation to follow the inspection, remedial and applicability rules set out in an external requirement document and the listed Dowty Rotol service bulletins.  \n\nIt affects aircraft owners/operators (who bear inspection and repair costs) and is enforced by the Civil Aviation Safety Authority; precise intervals, methods and corrective actions are specified only in the referenced documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-11-amdt-1-blade-operating-pin-inspection-for-cracking","history":"/api/acts/ad-pr-11-amdt-1-blade-operating-pin-inspection-for-cracking/history","analysis":"/api/acts/ad-pr-11-amdt-1-blade-operating-pin-inspection-for-cracking/analysis","conflicts":"/api/acts/ad-pr-11-amdt-1-blade-operating-pin-inspection-for-cracking/conflicts","importantCases":"/api/acts/ad-pr-11-amdt-1-blade-operating-pin-inspection-for-cracking/important-cases","documents":"/api/acts/ad-pr-11-amdt-1-blade-operating-pin-inspection-for-cracking/documents"}}