{"id":"F2009L03418","name":"AD/TPE 331/21 - Fuel Pump Spline Wear Inspection and/or Replacement - CANCELLED","slug":"ad-tpe-331-21-fuel-pump-spline-wear-inspection-and-or-replacement-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140996,"registerId":"commonwealth-F2009L03418-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AlliedSignal (Garrett/AiResearch) Turbin","sectionType":"division","heading":"AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series","content":"### AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series\n\n| AD/TPE 331/21 | Fuel Pump Spline WearInspection and/or Replacement | 10/2009 |\n| ------------- | -------------------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                 |\n| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 24 September 2009.                                                                                                                                 |\n| Background:  | This unique Australian AD specified inspections in accordance with Airesearch SB No. 73-0033 Rev 5 at intervals between 3000 and 3200 hours. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2009","sortOrder":0},{"sectionNumber":"AD/TPE 331/21","sectionType":"part","heading":"AD/TPE 331/21","content":"## AD/TPE 331/21","sortOrder":1},{"sectionNumber":"Fuel Pump Spline WearInspection and/or R","sectionType":"part","heading":"Fuel Pump Spline WearInspection and/or Replacement","content":"## Fuel Pump Spline Wear  \nInspection and/or Replacement","sortOrder":2},{"sectionNumber":"10/2009","sectionType":"part","heading":"10/2009","content":"## 10/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":4025},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"The legislation has been completely cancelled, eliminating all previously mandated inspection requirements for fuel pump splines. While the original purpose imposed specific maintenance obligations on aircraft operators, this version removes those obligations entirely, reducing the regulatory scope to nil."},"complexity_factors":["Single operative provision (cancellation)","No definitions or interpretation clauses","No conditional logic, exceptions, or procedural steps","Minimal historical reference only"],"plain_english_summary":"**This document cancels a previous aircraft safety rule.**\n\nThis Airworthiness Directive (AD) officially scraps the requirement for operators to inspect and potentially replace fuel pump splines on AlliedSignal (Garrett/AiResearch) TPE 331 turbine engines.\n\n**Key points:**\n*   **Who cares:** Anyone flying or maintaining aircraft with TPE 331 engines (common in regional airliners and agricultural aircraft).\n*   **What it did:** Previously, you had to check the fuel pump splines every 3,000 to 3,200 flight hours per a specific service bulletin.\n*   **What changed:** As of 24 September 2009, that inspection is no longer mandatory. CASA decided the rule was obsolete.\n\n**Bottom line:** One less maintenance task for these engines, saving time and money for operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-21-fuel-pump-spline-wear-inspection-and-or-replacement-cancelled","history":"/api/acts/ad-tpe-331-21-fuel-pump-spline-wear-inspection-and-or-replacement-cancelled/history","analysis":"/api/acts/ad-tpe-331-21-fuel-pump-spline-wear-inspection-and-or-replacement-cancelled/analysis","conflicts":"/api/acts/ad-tpe-331-21-fuel-pump-spline-wear-inspection-and-or-replacement-cancelled/conflicts","importantCases":"/api/acts/ad-tpe-331-21-fuel-pump-spline-wear-inspection-and-or-replacement-cancelled/important-cases","documents":"/api/acts/ad-tpe-331-21-fuel-pump-spline-wear-inspection-and-or-replacement-cancelled/documents"}}