{"id":"F2006B07444","name":"AD/TPE 331/34 - Beryllium Spectrometric Oil Analysis","slug":"ad-tpe-331-34-beryllium-spectrometric-oil-analysis","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49754,"registerId":"commonwealth-F2006B07444-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/34 - Beryllium Spectrometric Oil Analysis","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)  AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series\n\n \n\nAD/TPE 331/34 Beryllium Spectrometric Oil Analysis 9/88\n\nCANCELLED.\n\n \n\nBackground: Revision 1 to GTEC SB TPE 331-72-0530 cancels the requirement to 'SOAP' check for beryllium as the inspection has not proved completely effective in detecting beryllium copper nut erosion. This Directive is therefore cancelled.\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":1,"scope_assessment":{"changed":false,"description":"This is a straightforward cancellation of a single airworthiness directive. The scope remains precisely limited to removing one specific testing requirement for one engine series. No expansion of regulatory scope has occurred."},"complexity_factors":["Single operative word: 'CANCELLED'","No defined terms section","No conditional logic or cross-references to other legislation","Extremely short document (under 150 words of substantive content)","No operative provisions — purely administrative cancellation","Background explanation is narrative, not legal drafting"],"plain_english_summary":"This is a **cancellation notice** for an aviation safety rule about engine oil testing.\n\n**What it was:** Airworthiness Directive AD/TPE 331/34 previously required airlines and aircraft operators to perform \"SOAP\" checks — a laboratory test that looks for tiny metal particles in engine oil. Specifically, they had to check for **beryllium**, a toxic metal that could indicate wear on beryllium copper nuts inside AlliedSignal (Garrett/AiResearch) TPE 331 turbine engines.\n\n**Why it's cancelled:** The engine manufacturer (GTEC) revised their service bulletin and found these oil tests weren't reliably detecting the nut erosion they were meant to catch. Since the safety check wasn't working as intended, the Civil Aviation Safety Authority has scrapped the requirement entirely.\n\n**Who this affects:** Operators of aircraft with TPE 331 series turbine engines — commonly used in regional airliners and utility aircraft. They no longer need to perform this specific oil analysis.\n\n**Why it matters:** This removes a regulatory burden that wasn't providing adequate safety protection. Operators save time and money on unnecessary testing, while the regulator acknowledges that better detection methods are needed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"Scope was reduced: the original AD requirement to perform the beryllium spectrometric oil ('SOAP') check for TPE 331 series engines has been cancelled. The source explicitly attributes the cancellation to Revision 1 of GTEC Service Bulletin TPE 331-72-0530, which \"cancels the requirement to 'SOAP' check for beryllium\" because the inspection \"has not proved completely effective in detecting beryllium copper nut erosion.\" The entry does not indicate any replacement requirement or alternate inspection method."},"complexity_factors":["Single, discrete administrative action (cancellation) rather than a multipart regulatory scheme.","Short, specific rationale provided in the source (ineffective inspection), reducing ambiguity about why change occurred.","No technical implementation details or replacement requirements included in the source, limiting procedural complexity but increasing scope ambiguity for operators.","Multiple actors involved (manufacturer/service bulletin author and regulator) but their roles are plainly stated in a single background sentence.","Limited statutory or cross-referential material in the supplied text — few legal references to interpret or reconcile."],"plain_english_summary":"This entry records cancellation of AD/TPE 331/34, which had required beryllium spectrometric oil (\"SOAP\") checks for AlliedSignal TPE331 engines. The cancellation follows Revision 1 to GTEC SB TPE 331‑72‑0530, which found the SOAP inspection ineffective at detecting beryllium‑copper nut erosion.\n\nPractically, operators and maintenance organisations no longer must perform that AD‑mandated test, reducing compliance costs but leaving a potential detection gap unless an alternative is adopted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-34-beryllium-spectrometric-oil-analysis","history":"/api/acts/ad-tpe-331-34-beryllium-spectrometric-oil-analysis/history","analysis":"/api/acts/ad-tpe-331-34-beryllium-spectrometric-oil-analysis/analysis","conflicts":"/api/acts/ad-tpe-331-34-beryllium-spectrometric-oil-analysis/conflicts","importantCases":"/api/acts/ad-tpe-331-34-beryllium-spectrometric-oil-analysis/important-cases","documents":"/api/acts/ad-tpe-331-34-beryllium-spectrometric-oil-analysis/documents"}}