{"id":"F2006B07243","name":"AD/T53/14 - Torque Meter Boost Pump - Replacement","slug":"ad-t53-14-torque-meter-boost-pump-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49120,"registerId":"commonwealth-F2006B07243-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/T53/14 - Torque Meter Boost Pump - Replacement","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 (Lycoming) Turbine Engines - T53 Series\n\n \n\nAD/T53/14 Torque Meter Boost Pump - Replacement 1/86\n\nApplicability: All T53 series engines.\n\n \n\nDocument: 1. Remove torque meter boost pump P/No. 1-300-221-01 or P/No. 1-300-221-02 and replace with P/No. 1-300-221.04; or\n\n \n\nNote: Avco Lycoming SB No. 0031 pertains to this subject.\n\n \n\n2. FAA AD 75-22-02, Amendment 39-2385; or\n\n \n\n3. AD/LYC-T/15.\n\n \n\nCompliance: Within 200 hours time in service after 31 December 1975.\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 safety directive focused solely on torque meter boost pump replacement. The scope remains tightly constrained to its original purpose — addressing a specific defective part in T53 engines. There is no evidence of scope creep or expansion beyond this narrow technical remedy."},"complexity_factors":["Extremely short document — approximately 150 words of substantive content","Only 2 defined part numbers explicitly referenced (1-300-221-01, 1-300-221-02, 1-300-221-04)","Single, unambiguous compliance action (remove and replace)","Simple temporal compliance trigger (200 hours time in service after fixed date)","No nested exceptions, conditional logic, or cross-references to other legislative provisions","References to external technical documents (FAA AD, manufacturer service bulletin) are informational rather than legally operative","No interpretation section, definitions, or administrative machinery"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1988.\n\n**What it does:**\nOrders owners and operators of **AlliedSignal (Lycoming) T53 series turbine engines** to replace a specific faulty part — the **torque meter boost pump** — with an updated, safer version.\n\n**Who must comply:**\nAnyone operating aircraft with **any T53 series engine** (commonly used in helicopters like the Bell UH-1 Iroquois \"Huey\" and Bell 204/205).\n\n**The specific requirement:**\n- **Remove** torque meter boost pumps with part numbers **1-300-221-01** or **1-300-221-02**\n- **Replace** with improved part number **1-300-221-04**\n\n**Deadline:**\nWithin **200 hours of engine operating time** after **31 December 1975**.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. Non-compliance means the aircraft cannot legally fly. This particular AD addresses a potential mechanical failure in the torque meter boost pump that could affect engine performance monitoring or safe operation. The directive references equivalent US Federal Aviation Administration (FAA) and manufacturer service bulletins, showing it aligns with international safety standards.\n\n**Key point:** Even though this AD dates from 1975 (indicated by \"1/86\" — likely a reissue or amendment reference), it remains enforceable for any T53 engines still in service."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text itself specifies the action (replacement of specific boost pump part numbers), the engines covered (all T53 series), and the compliance deadline (200 hours after 31 December 1975). The directive does not, within the supplied text, expand or narrow that coverage compared with the mandate it states; no indication of an amendment or change in scope from an earlier statement is present in the material provided."},"complexity_factors":["Narrow applicability: applies to a single engine family (\"Applicability: All T53 series engines\").","Single technical action: removal of specified part numbers and installation of a single replacement part (\"Document: 1.\").","Cross-references to additional documents and ADs that may require consultation for technical detail (\"Note: Avco Lycoming SB No. 0031\"; \"Document: 2.\" and \"Document: 3.\").","Fixed compliance timeframe that is retroactive to a calendar date (\"Within 200 hours time in service after 31 December 1975\"), which can affect scheduling and logistics.","Precision of parts numbering increases administrative/maintenance accuracy requirements (three specific P/No. values listed)."],"plain_english_summary":"All operators of AlliedSignal (Lycoming) T53 series turbine engines must replace boost pump P/N 1-300-221-01 or 1-300-221-02 with P/N 1-300-221.04. Issued under the Civil Aviation Safety Authority’s airworthiness directives, the replacement is mandatory to maintain airworthiness and must be completed within 200 hours time in service after 31 December 1975; related service and FAA ADs are cited for technical detail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-t53-14-torque-meter-boost-pump-replacement","history":"/api/acts/ad-t53-14-torque-meter-boost-pump-replacement/history","analysis":"/api/acts/ad-t53-14-torque-meter-boost-pump-replacement/analysis","conflicts":"/api/acts/ad-t53-14-torque-meter-boost-pump-replacement/conflicts","importantCases":"/api/acts/ad-t53-14-torque-meter-boost-pump-replacement/important-cases","documents":"/api/acts/ad-t53-14-torque-meter-boost-pump-replacement/documents"}}