{"id":"F2006B07440","name":"AD/TPE 331/30 Amdt 2 - Fuel Pump Drive Shaft","slug":"ad-tpe-331-30-amdt-2-fuel-pump-drive-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49738,"registerId":"commonwealth-F2006B07440-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/30 Amdt 2 - Fuel Pump Drive Shaft","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 331/30\n\nAmdt 2\n\n\nFuel Pump Drive Shaft 4/88\n\n \n\nApplicability: TPE 331 models as listed in Garrett Service Bulletin TPE 331-73-0121 Rev 5. Requirement:               Garrett Service Bulletin TPE 331-73-0121 Rev 5.\n\nCompliance: Unless already accomplished; in accordance with Requirement document Para D.\n\n \n\nNote: Compliance with the previous issue of this Directive (SB TPE 334-73-0121 Rev 4) does not necessarily constitute compliance with this Directive - refer Rev 5 Accomplishment Instruction Section 2.\n\n \n\nBackground: This Directive is amended to reflect GTEC SB TPE 331-73-0121 Rev 5 which deletes engine models, corrects a part number and adds reference to SB 73-0156 and a hazardous material warning.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 routine amendment (Amendment 2) to an existing Airworthiness Directive. The changes are minor technical updates: removing some engine models from coverage, correcting a part number, and adding cross-references to related bulletins and safety warnings. The scope remains tightly focused on the original purpose — ensuring safe fuel pump drive shafts in TPE 331 engines."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined reference (the Service Bulletin)","No nested conditional logic — simple 'unless already accomplished' exception","Single cross-reference to external technical document","No interpretation section or defined terms","Straightforward applicability and compliance structure typical of aviation safety directives"],"plain_english_summary":"This CASA Airworthiness Directive orders operators and maintenance organisations of certain AlliedSignal (Garrett/AiResearch) TPE331 turbine engines to comply with Garrett Service Bulletin TPE331-73-0121 Revision 5 to address fuel pump drive‑shaft defects. It affects TPE331-equipped regional turboprops and warns that prior compliance with earlier revisions may not suffice. The amendment updates affected models, corrects a part number, and adds hazardous‑materials safety warnings to prevent engine failures that could cause catastrophic accidents."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. The amendment modifies the directive’s scope and obligations by deleting certain engine models from applicability, correcting a part number, and adding a cross-reference to SB 73-0156 plus a hazardous‑materials warning. These changes alter which engines and parts are subject to the directive and add procedural/handling requirements. (See Applicability; Requirement; Note; Background.)"},"complexity_factors":["Relies entirely on an external technical document (Garrett Service Bulletin TPE 331-73-0121 Rev 5) to define required work and compliance steps (Requirement; Compliance).","Amendment changes applicability by deleting engine models, requiring operators to check the revised applicability list (Background; Applicability).","Correction of a part number requires verification of parts records and may trigger parts replacement or procurement changes (Background).","Adds reference to another service bulletin (SB 73-0156), increasing the number of cross-referenced compliance obligations (Background).","Introduces a hazardous-materials warning that imposes additional handling or procedural obligations for maintenance staff (Background).","Note warns that compliance with the previous revision (Rev 4) may not satisfy the new requirements, creating potential uncertainty for operators relying on earlier compliance."],"plain_english_summary":"AD/TPE 331/30 Amdt 2 requires operators and maintenance organisations of specified AlliedSignal (Garrett/AiResearch) TPE 331 turbine engines to carry out the fuel-pump drive‑shaft work described in Garrett Service Bulletin TPE 331-73-0121 Rev 5. The amendment updates which engine models are covered, corrects a part number, and adds a cross-reference to another service bulletin and a hazardous‑materials warning. Compliance must be performed as set out in the Service Bulletin (para D)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-30-amdt-2-fuel-pump-drive-shaft","history":"/api/acts/ad-tpe-331-30-amdt-2-fuel-pump-drive-shaft/history","analysis":"/api/acts/ad-tpe-331-30-amdt-2-fuel-pump-drive-shaft/analysis","conflicts":"/api/acts/ad-tpe-331-30-amdt-2-fuel-pump-drive-shaft/conflicts","importantCases":"/api/acts/ad-tpe-331-30-amdt-2-fuel-pump-drive-shaft/important-cases","documents":"/api/acts/ad-tpe-331-30-amdt-2-fuel-pump-drive-shaft/documents"}}