{"id":"F2006B07244","name":"AD/T53/15 - Fuel Regulator - P1 Multiplier Connector Assembly Damping","slug":"ad-t53-15-fuel-regulator-p1-multiplier-connector-assembly-damping","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49123,"registerId":"commonwealth-F2006B07244-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/T53/15 - Fuel Regulator - P1 Multiplier Connector Assembly Damping","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/T53/15  Fuel Regulator - P1 Multiplier Connector Assembly Damping\n\n\n1/86\n\n \n\nApplicability: All T53 engines fitted with Chandler Evans Corporation (CECO) Fuel Regulators. Document:              1.              Lycoming SB 0048, Rev. 1; or\n\n2.        FAA AD 77-17-08 Amdt. 39-3019 as amended by Amdt. 39-3165; or\n\n \n\n3.        AD/LYC-T/16A. Compliance: Before 31 July 1978.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text imposes a narrowly targeted requirement on T53 engines with CECO fuel regulators to comply with specified service/airworthiness documents by a fixed date. The instrument itself does not indicate any expansion or narrowing of that target compared with its stated purpose (addressing P1 multiplier connector assembly damping); there is no internal text suggesting a change of scope from the original stated objective. (Applicability; Document; Compliance)"},"complexity_factors":["Clear, narrow applicability (\"All T53 engines fitted with Chandler Evans Corporation (CECO) Fuel Regulators\") reduces scope ambiguity. (Applicability)","Prescriptive cross-references to external technical documents (Lycoming SB 0048 Rev.1; FAA AD 77-17-08 as amended; AD/LYC-T/16A) require operators to consult and follow other materials, adding procedural complexity. (Document)","Technical mechanical nature of the work (damping of P1 multiplier connector assembly) requires specialist maintenance skills and possibly parts, increasing practical implementation complexity.","A firm compliance deadline creates scheduling and operational constraints (Compliance).","Potential for minor ambiguity if the referenced documents differ in detail or are unavailable, creating administrative complexity. (Document)"],"plain_english_summary":"This airworthiness directive requires owners/operators of AlliedSignal (Lycoming) T53 series engines fitted with Chandler Evans (CECO) fuel regulators to have specified damping work performed on the P1 multiplier connector assembly by 31 July 1978, using the cited service/airworthiness documents. \n\nOperators bear the costs and must comply to retain certified airworthiness; independent maintenance organisations may perform the work if they follow the referenced technical instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific engine series. It has not expanded beyond its original purpose of mandating a single engineering fix."},"complexity_factors":["Extremely short document — only 4 substantive paragraphs","Single, specific mechanical issue (fuel regulator damping assembly)","Clear applicability clause identifying exact engine series and manufacturer","Simple compliance mechanism: follow one of three referenced technical documents","Single, absolute deadline (31 July 1978) with no conditional extensions or exceptions","No defined terms section, no cross-references to other legislation, no nested conditions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft engines.\n\n**What it does:**\nOrders owners and operators of certain helicopter engines (the T53 series made by Lycoming, now part of Honeywell) to fix a specific mechanical problem. The issue involves the **fuel regulator** — a component that controls fuel flow to the engine. Specifically, it requires modifications to the \"P1 Multiplier Connector Assembly Damping\" — a part that helps stabilise fuel pressure readings to prevent dangerous engine fluctuations.\n\n**Who it affects:**\nAnyone operating aircraft with T53 engines that use Chandler Evans Corporation (CECO) fuel regulators. These engines are commonly found in helicopters like the Bell UH-1 \"Huey\" and AH-1 Cobra.\n\n**Why it matters:**\nFaulty damping in this assembly could cause erratic fuel control, potentially leading to engine failure or power loss in flight — obviously catastrophic in a helicopter. The directive mandates compliance by **31 July 1978**, meaning this was a time-critical safety fix.\n\n**How to comply:**\nOperators must follow one of three approved technical documents (a Lycoming service bulletin or equivalent FAA directives) to inspect and modify the affected component."}},"importantCases":[],"_links":{"self":"/api/acts/ad-t53-15-fuel-regulator-p1-multiplier-connector-assembly-damping","history":"/api/acts/ad-t53-15-fuel-regulator-p1-multiplier-connector-assembly-damping/history","analysis":"/api/acts/ad-t53-15-fuel-regulator-p1-multiplier-connector-assembly-damping/analysis","conflicts":"/api/acts/ad-t53-15-fuel-regulator-p1-multiplier-connector-assembly-damping/conflicts","importantCases":"/api/acts/ad-t53-15-fuel-regulator-p1-multiplier-connector-assembly-damping/important-cases","documents":"/api/acts/ad-t53-15-fuel-regulator-p1-multiplier-connector-assembly-damping/documents"}}