{"id":"F2006B06310","name":"AD/PR/12 - Blade Eyebolt and Operating Link Group - Inspection and/or Rework","slug":"ad-pr-12-blade-eyebolt-and-operating-link-group-inspection-and-or-rework","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47429,"registerId":"commonwealth-F2006B06310-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PR/12 - Blade Eyebolt and Operating Link Group - Inspection and/or Rework","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/12 Blade Eyebolt and Operating Link NK\n\nGroup - Inspection and/or Rework\n\nApplicability: All 20 root, 30 root and 40 root propellers fitted to RR Dart engined aircraft. Document:               Alert SB No. 61-A753 and SB No. 61-754.\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\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 mechanical component (blade eyebolts and operating link groups) on specific propeller models. It reflects the original purpose of ADs: targeted safety interventions for identified airworthiness issues. No scope creep is evident."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies entirely on external technical references","No conditional logic or nested exceptions within the directive itself","Simple structure: applicability statement + compliance requirement + document references","Complexity is externalised to referenced Service Bulletins (SB 61-A753 and SB 61-754), which contain the actual technical detail"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates safety inspections and potential repairs for specific aircraft propellers.\n\n**What it does:**\n- Requires owners and operators to inspect or rework the **blade eyebolts** and **operating link groups** on certain Dowty Rotol variable-pitch propellers.\n- These propellers have 20, 30, or 40 \"roots\" (mounting points) and are fitted to aircraft powered by **Rolls-Royce Dart engines** — commonly used in older regional airliners like the Fokker F27 and some HS 748 aircraft.\n\n**Who it affects:**\n- Aircraft operators and maintenance organisations using these specific propeller models.\n- Owners of vintage or heritage aircraft with RR Dart engines and Dowty Rotol propellers.\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. Non-compliance grounds an aircraft (meaning it cannot fly legally).\n- The directive references specific **Service Bulletins** (manufacturer-issued repair instructions) that detail the actual inspection or rework procedures. This suggests the manufacturer identified a potential defect or wear pattern that could affect flight safety.\n\n**Key point:** This document itself doesn't contain the technical instructions — it simply orders compliance with separate technical documents (Alert SB 61-A753 and SB 61-754)."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD defines its scope explicitly (all 20‑root, 30‑root and 40‑root propellers fitted to RR Dart engined aircraft) and does not indicate any amendment or change to that scope within the text provided. There is no statement in this instrument that alters or expands the applicability beyond what is listed. (Applicability)"},"complexity_factors":["Technical nature of inspections and possible rework (mechanical and maintenance expertise required).","Key procedural details are deferred to external documents (Alert SB No. 61‑A753 and 61‑754), requiring operators to obtain and interpret those documents.","Operational impacts (aircraft downtime and parts logistics) depend on the external SB specifications and are not detailed in the AD.","Applicability is narrowly defined (specific propeller root types on RR Dart aircraft), which reduces scope but requires accurate fleet identification.","AD text provides no timing, acceptability criteria or alternatives, increasing dependency on the service bulletins for implementation decisions."],"plain_english_summary":"This AD mandates inspection—and where required, rework or replacement—of the blade eyebolt and operating link group on specified Dowty Rotol variable‑pitch propellers installed on Rolls‑Royce Dart‑engined aircraft. Compliance must follow the procedures and intervals set out in the referenced Alert Service Bulletins, so operators and maintenance organisations bear the direct costs and must adjust maintenance scheduling, resources and spares. The AD is brief and delegates technical detail to the service bulletins, increasing reliance on their clarity and timely availability."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-12-blade-eyebolt-and-operating-link-group-inspection-and-or-rework","history":"/api/acts/ad-pr-12-blade-eyebolt-and-operating-link-group-inspection-and-or-rework/history","analysis":"/api/acts/ad-pr-12-blade-eyebolt-and-operating-link-group-inspection-and-or-rework/analysis","conflicts":"/api/acts/ad-pr-12-blade-eyebolt-and-operating-link-group-inspection-and-or-rework/conflicts","importantCases":"/api/acts/ad-pr-12-blade-eyebolt-and-operating-link-group-inspection-and-or-rework/important-cases","documents":"/api/acts/ad-pr-12-blade-eyebolt-and-operating-link-group-inspection-and-or-rework/documents"}}