{"id":"F2006B07402","name":"AD/TFE 731/2 - Fuel Pump Anti-Icing Valve - Inspection","slug":"ad-tfe-731-2-fuel-pump-anti-icing-valve-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49614,"registerId":"commonwealth-F2006B07402-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TFE 731/2 - Fuel Pump Anti-Icing Valve - Inspection","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 - TFE731 Series\n\n \n\nAD/TFE731/2 Fuel Pump Anti-Icing Valve - Inspection 3/86\n\nApplicability: TFE-731-2-1C, -2-2B fitted with fuel control assemblies P/No. 3070900-1 and 3070900-2.\n\n \n\nDocument: 1. AiResearch SB TFE 731-73-3004; or\n\n \n\n2. FAA AD No. 74-13-09; or\n\n \n\n3. AD/AIR-T/29.\n\n \n\nCompliance: Within 100 hours time in service after 27 February 1976.\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, single-issue airworthiness directive from 1986 (referencing 1976 compliance dates). It addresses one specific mechanical component on specific engine models. There is no indication of scope creep; it remains tightly focused on its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability criteria (engine models and part numbers)","Simple compliance requirement (single time-based deadline)","No nested exceptions or conditional logic","No cross-references to other legislation sections","Straightforward reference to external technical documents rather than internal legislative provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a safety inspection for specific aircraft engines.\n\n**What it does:**\n- Requires owners/operators to inspect the **fuel pump anti-icing valve** on certain AlliedSignal (Garrett/AiResearch) TFE731 series turbine engines.\n- The anti-icing valve prevents ice from forming in the fuel system, which could cause engine failure.\n\n**Who it affects:**\n- Operators of aircraft using **TFE-731-2-1C or TFE-731-2-2B engines** that have specific fuel control part numbers (3070900-1 and 3070900-2).\n\n**What must be done:**\n- The inspection must be completed **within 100 hours of flight time** after 27 February 1976.\n- Mechanics can follow one of three approved technical documents to perform the inspection:\n  - AiResearch Service Bulletin TFE 731-73-3004, OR\n  - FAA Airworthiness Directive 74-13-09, OR\n  - Australian AD/AIR-T/29.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. Failure to comply means the aircraft cannot legally fly. This particular directive addresses a potential defect that could cause engine failure due to ice buildup in the fuel system."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument maintains a narrowly targeted inspection requirement limited to specified TFE‑731 engine variants fitted with particular fuel control assemblies and sets a single, short compliance deadline. The AD does not expand scope beyond those engines or parts and delegates procedural detail to the listed service bulletin(s) and ADs."},"complexity_factors":["Narrow technical applicability (specific engine models and fuel control assembly part numbers)","Short fixed compliance window (100 hours after a specified date)","Dependence on external technical documents (service bulletin and other ADs) for procedural detail","Mandatory regulatory character with limited operator discretion","Minimal content in the AD itself (procedural details are offloaded to referenced documents)"],"plain_english_summary":"This AD requires inspection of the fuel pump anti‑icing valve on AlliedSignal TFE731‑2‑1C and TFE731‑2‑2B engines fitted with fuel control assemblies P/N 3070900‑1 or ‑2, to be completed within 100 hours TIS after 27 Feb 1976. The AD is mandatory, issued by the Civil Aviation Safety Authority, and points to AiResearch SB TFE 731‑73‑3004 or FAA AD 74‑13‑09 for the inspection procedure.\n\nCosts, downtime and any repairs fall to operators/owners; compliance depends on following the referenced technical documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tfe-731-2-fuel-pump-anti-icing-valve-inspection","history":"/api/acts/ad-tfe-731-2-fuel-pump-anti-icing-valve-inspection/history","analysis":"/api/acts/ad-tfe-731-2-fuel-pump-anti-icing-valve-inspection/analysis","conflicts":"/api/acts/ad-tfe-731-2-fuel-pump-anti-icing-valve-inspection/conflicts","importantCases":"/api/acts/ad-tfe-731-2-fuel-pump-anti-icing-valve-inspection/important-cases","documents":"/api/acts/ad-tfe-731-2-fuel-pump-anti-icing-valve-inspection/documents"}}