{"id":"F2006B06313","name":"AD/PR/15 - Blade Bearings - Overhaul Procedures","slug":"ad-pr-15-blade-bearings-overhaul-procedures","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47439,"registerId":"commonwealth-F2006B06313-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PR/15 - Blade Bearings - Overhaul Procedures","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/15 Blade Bearings - Overhaul Procedures NK\n\nApplicability: All models. Document: SB No. 61-380. Effective:  31 January 1974.\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 discrete, single-issue airworthiness directive from 1974 addressing a specific maintenance procedure for a specific propeller component. There is no evidence of scope creep; it remains tightly focused on blade bearing overhauls for Dowty Rotol propellers as originally intended."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — relies entirely on external technical reference (SB No. 61-380)","No conditional logic, exceptions, or nested provisions","Single, unambiguous applicability clause ('All models')","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Straightforward command structure: applies to X, do Y, effective Z"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). \n\n**What it does:**\n- Requires specific **overhaul procedures** (detailed maintenance work) for **blade bearings** on variable-pitch propellers made by Dowty Rotol.\n- Blade bearings are critical components that allow the propeller blades to change angle (pitch) during flight.\n\n**Who it affects:**\n- Owners and operators of aircraft fitted with **any model** of Dowty Rotol variable-pitch propellers.\n- Licensed aircraft maintenance engineers who perform overhauls on these propellers.\n\n**Why it matters:**\n- Faulty blade bearings can cause propeller failure, potentially leading to loss of control or engine damage.\n- Compliance is **legally mandatory** — aircraft cannot fly legally if this directive is not followed.\n\n**Key details:**\n- **Document reference:** Service Bulletin No. 61-380 (the technical instructions for the overhaul).\n- **Effective date:** 31 January 1974.\n- **Identifier:** AD/PR/15 — the \"PR\" indicates it relates to propellers, \"15\" is the sequence number."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The source text provides no indication that the scope has been changed from its original formulation. The entry states applicability as “All models,” references Service Bulletin No. 61-380 for procedures, and gives an effective date of 31 January 1974 (source: Applicability, Document, and Effective lines). There is no text in the supplied source showing an amendment, narrowing, or expansion relative to an earlier version."},"complexity_factors":["Minimal text: the AD entry is brief and largely a pointer to an external document (source: Document: SB No. 61-380).","External-document dependence: substantive technical requirements are contained in the referenced service bulletin, not in the AD text (source: Document line).","Broad applicability: the AD applies to “All models,” which expands the set of affected operators and increases practical scope despite the short text (source: Applicability line).","Lack of procedural detail: the AD does not specify compliance deadlines, exemptions, or enforcement mechanisms in the text provided (source: entire entry).","Regulatory placement: it is issued within the CASA Schedule of Airworthiness Directives under Part 39 - 107, which places it in an external regulatory framework that may add procedural complexity (source: header)."],"plain_english_summary":"AD/PR/15 directs that blade-bearing overhaul work follow the procedures in Service Bulletin No. 61‑380. Issued in CASA’s Schedule of Airworthiness Directives under Part 39‑107 (effective 31 Jan 1974), it applies to “All models.” Practically, operators, owners and maintenance organisations must consult SB 61‑380 when overhauling blade bearings, centralising the technical standard and shifting compliance costs to those performing the work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-15-blade-bearings-overhaul-procedures","history":"/api/acts/ad-pr-15-blade-bearings-overhaul-procedures/history","analysis":"/api/acts/ad-pr-15-blade-bearings-overhaul-procedures/analysis","conflicts":"/api/acts/ad-pr-15-blade-bearings-overhaul-procedures/conflicts","importantCases":"/api/acts/ad-pr-15-blade-bearings-overhaul-procedures/important-cases","documents":"/api/acts/ad-pr-15-blade-bearings-overhaul-procedures/documents"}}