{"id":"F2006B07593","name":"AD/VW/2 - Cast Crankshafts","slug":"ad-vw-2-cast-crankshafts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50250,"registerId":"commonwealth-F2006B07593-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VW/2 - Cast Crankshafts","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Volkswagen Derivative Piston Engines\n\n \n\nAD/VW/2 Cast Crankshafts 8/88\n\nApplicability: Revmaster R2100D engines fitted with ductile steel crankshafts.\n\n \n\nRequirement: Replace cast crankshafts fitted to applicable engines with the equivalent forged crankshaft.\n\n \n\nCompliance: Before installation in an aircraft.\n\n \n\nBackground:  This Directive has been issued to reflect, in part, the requirements of cancelled Airworthiness Directive ANO 106 AD/REV/1A. The inspection requirements of AD/REV/1A are n ow contained in Airworthiness Directive ANO 106 AD/VW/1.\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 safety directive with a single, focused purpose. It has not expanded beyond its original intent of mandating crankshaft replacement for safety reasons."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative sections: Applicability, Requirement, Compliance, and Background","No defined terms section — all language is plain technical English","No cross-references to other legislation except a historical note about a cancelled directive","Single, unambiguous requirement with clear timing (before installation)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires specific action on aircraft or aircraft parts.\n\n**What it does:** It orders that **cast (moulded) crankshafts** in certain Volkswagen-derived aircraft engines must be **replaced with stronger forged crankshafts** before the engine can be installed in an aircraft.\n\n**Who it affects:** Owners, operators, and maintainers of **Revmaster R2100D engines** that currently have ductile steel (cast) crankshafts fitted.\n\n**Why it matters:** Cast crankshafts can fail under stress in ways that forged crankshafts don't. This directive prevents engine failures that could cause accidents. It also tidies up older safety rules by moving some inspection requirements to a separate directive (AD/VW/1) while keeping this replacement rule active."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"Compared with the cancelled AD referenced in the Background, this directive focuses on mandatory replacement of cast crankshafts with forged equivalents and places inspection requirements separately in AD/VW/1. The practical scope therefore appears narrowed in this instrument to replacement before installation, while inspection obligations have been relocated to another directive (Background)."},"complexity_factors":["Very narrow applicability: applies only to Revmaster R2100D engines fitted with ductile steel (cast) crankshafts (Applicability).","Single clear mandatory action: replace cast crankshafts with equivalent forged crankshafts (Requirement).","Simple timing requirement: replacement must be done before installation in an aircraft (Compliance).","Cross-reference to other ADs: inspection requirements moved to AD/VW/1, so implementers must consult multiple directives (Background).","No detailed procedural, certification or enforcement provisions included in the text supplied (reduces legal complexity but shifts detail into related ADs)."],"plain_english_summary":"This directive requires that any Revmaster R2100D engine fitted with a cast (ductile steel) crankshaft be fitted with an equivalent forged crankshaft before the engine is installed in an aircraft. It affects engine owners, maintainers and installers, who bear the cost and must change procurement and pre‑installation checks. The AD replaces elements of a cancelled directive by focusing on mandatory replacement, while related inspection obligations are now covered separately."}},"importantCases":[],"_links":{"self":"/api/acts/ad-vw-2-cast-crankshafts","history":"/api/acts/ad-vw-2-cast-crankshafts/history","analysis":"/api/acts/ad-vw-2-cast-crankshafts/analysis","conflicts":"/api/acts/ad-vw-2-cast-crankshafts/conflicts","importantCases":"/api/acts/ad-vw-2-cast-crankshafts/important-cases","documents":"/api/acts/ad-vw-2-cast-crankshafts/documents"}}