{"id":"F2006B07422","name":"AD/TPE 331/14 Amdt 1 - Fuel Control Drive - Inspection and Replacement","slug":"ad-tpe-331-14-amdt-1-fuel-control-drive-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49679,"registerId":"commonwealth-F2006B07422-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/14 Amdt 1 - Fuel Control Drive - Inspection and Replacement","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAlliedSignal (Garrett/AiResearch) Turbine Engines \\- TPE 331 Series\n\nAD/TPE 331/14\n\nAmdt 1\n\n  \nFuel Control Drive \\- Inspection and Replacement 5/96\n\nApplicability: TPE-331-25AA, \\-25DA, 25FA. TPE-331-43A, \\-47A, \\-55A, \\-61A, \\-25AB, \\-25DB, \\-\n\n43BL, -55B unless incorporating SB TPE-331-73-0056 and SB TPE-331-72-0123. TPE-331-1-100F, -101B, E, F, J, L, Z. TPE-331-1-151A, G, and K. TPE-331-2- 201A and C. TPE-331-2UA-203D,TPE-331-5-251M, TPE-331-6-252M, -252B, TPE-331-5-251C, K. TPE-331-6-251M, TPE-331-3U-303G, N, V & TPE-331-3U- 304G. TPE-331-5-252M, TPE-331-5-252K, unless incorporating SB TPE-331-73-\n\n0051 or TPE-331-73-0054 and SB TPE/TSE 331-72-0104.\n\nRequirement: Inspect and lubricate the fuel pump drive shaft splines in accordance with Garrett (AiResearch) SB No. TPE/TSE 331-72-0027, Rev. 9.\n\nNote 1. FAA AD 73-26-07 R3 also refers. Note 2. This AD supersedes AD/AIR-T/17E.\n\nNote 3. Compliance with AD/AIR-T/17E meets the intent of this AD.\n\nCompliance: As detailed in the requirement document.\n\nThis amendment becomes effective on 25 April 1996.\n\nBackground: Wear has been observed in the fuel pump drive shaft splines. This Directive mandates a periodic inspection of the splines area.\n\nThis amendment includes an additional engine model, the TPE331-3U-304G to the applicability listing.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment represents a minor expansion of scope—adding a single engine model (TPE331-3U-304G) to the applicability list. The core purpose (mandating inspection of fuel pump drive shaft splines due to wear concerns) remains unchanged from the original 1996 directive."},"complexity_factors":["Extensive model number list with conditional exclusions (14+ engine variants with 'unless incorporating' exceptions for specific service bulletins)","Cross-reference to manufacturer service bulletin (SB TPE/TSE 331-72-0027 Rev. 9) for actual technical requirements","Multiple note references creating a web of related documents (FAA AD 73-26-07 R3, superseded AD/AIR-T/17E)","Technical aviation terminology requiring specialised knowledge (fuel pump drive shaft splines, service bulletins, airworthiness directives)"],"plain_english_summary":"This safety directive requires owners, operators, and maintenance organisations of certain AlliedSignal (Garrett/AiResearch) TPE331 turbine engines to inspect and lubricate the fuel pump drive shaft splines per the manufacturer's service bulletin. It's mandatory because spline wear has been found and could cause engine failure.\n\nAmendment 1 adds the TPE331-3U-304G to the affected models; compliance with the previous directive remains valid."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expanded the AD’s scope by adding the TPE331-3U-304G to the applicability list and restates mandatory inspection/lubrication per Garrett SB Rev. 9. It also supersedes AD/AIR-T/17E while noting that compliance with the earlier AD meets this AD’s intent (Applicability; Background; Notes; Requirement)."},"complexity_factors":["Extensive and specific applicability list across many engine models increases administrative effort to determine if an engine is covered (Applicability).","Procedural detail is delegated to an external document (Garrett Service Bulletin TPE/TSE 331-72-0027 Rev. 9), so the AD’s legal requirement requires consulting and following that SB (Requirement).","Cross-references to prior CASA AD (AD/AIR-T/17E) and FAA AD 73-26-07 R3 create dependency on earlier directives for compliance history and interpretation (Notes 1–3).","Amendment adds an engine model to applicability, indicating a slight expansion of scope and the need to update operator records (Background; Applicability).","Compliance timing and intervals are not set out in the AD text itself but are ‘as detailed in the requirement document,’ making compliance contingent on the SB’s specifics (Compliance; Requirement).","Effective date and supersession mechanics (effective 25 April 1996; supersedes AD/AIR-T/17E) require fleet-level tracking to avoid gaps or duplications in mandated inspections."],"plain_english_summary":"This Airworthiness Directive requires operators of specified AlliedSignal (Garrett/AiResearch) TPE331 turbine engines to inspect and lubricate the fuel-pump drive-shaft splines in line with Garrett Service Bulletin TPE/TSE 331-72-0027 Rev. 9. It applies to a long list of engine models (an additional model was added in this amendment) and became effective 25 April 1996. Owners and maintenance organisations must follow the service bulletin’s procedures; compliance with the earlier AD/AIR-T/17E is accepted as meeting this AD’s intent."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-14-amdt-1-fuel-control-drive-inspection-and-replacement","history":"/api/acts/ad-tpe-331-14-amdt-1-fuel-control-drive-inspection-and-replacement/history","analysis":"/api/acts/ad-tpe-331-14-amdt-1-fuel-control-drive-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-tpe-331-14-amdt-1-fuel-control-drive-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-tpe-331-14-amdt-1-fuel-control-drive-inspection-and-replacement/important-cases","documents":"/api/acts/ad-tpe-331-14-amdt-1-fuel-control-drive-inspection-and-replacement/documents"}}