{"id":"F2006B08710","name":"AD/DART/24 - Fuel Servo Pipe","slug":"ad-dart-24-fuel-servo-pipe","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51902,"registerId":"commonwealth-F2006B08710-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DART/24 - Fuel Servo Pipe","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)  Rolls Royce Turbine Engines - Dart Series\n\n \n\nAD/DART/24 Fuel Servo Pipe 6/93\n\nApplicability: Dart 506, 510, 511, 514, 515, 520, 525, 526, 527, 528, 529, 530, 532, 533, 534, 535,\n\n536, 542, 543, 550, 552 series engines.\n\n \n\nRequirement: Inspect the fuel servo pipe in accordance with the requirements of Rolls Royce Alert Service Bulletin Da73-A86.\n\n \n\nCompliance: Prior to 30 June 1993.\n\n \n\nBackground: This Directive requires a once only inspection of the fuel servo pipe. The requirement follows three reports of fuel leakage from the servo pipe between the fuel pump and the fuel control unit.\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, time-limited safety directive focused on a specific mechanical defect. It has not expanded beyond its original purpose of addressing reported fuel leaks in the specified engine series."},"complexity_factors":["Single, specific mechanical component targeted (fuel servo pipe)","One-time inspection requirement with fixed deadline","No defined terms section — relies on external technical reference (Rolls Royce Service Bulletin)","No conditional logic, exceptions, or nested provisions","Extremely short — approximately 150 words of substantive content","Simple applicability list (engine model numbers only)"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Rolls Royce Dart series turbine engines** used in aircraft.\n\n**What it does:**\n- Requires aircraft operators to **inspect a specific fuel pipe** (the \"fuel servo pipe\") that runs between the fuel pump and the fuel control unit.\n- The inspection must follow the exact procedure laid out in a Rolls Royce technical bulletin (Alert Service Bulletin Da73-A86).\n\n**Why it matters:**\n- Three reports of **fuel leakage** from this pipe prompted the directive. Fuel leaks near hot turbine engines create fire risks.\n- This was a **one-time inspection** required to be completed before 30 June 1993.\n\n**Who it affects:**\n- Owners and operators of aircraft fitted with the listed Dart engine models (506 through 552 series).\n- Maintenance engineers responsible for keeping these engines airworthy.\n\nAirworthiness Directives are legally binding. Flying an aircraft without complying with an AD can ground the aircraft and expose operators to penalties."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope remains a one‑time inspection of the fuel servo pipe on the specified Rolls Royce Dart engine series, to be performed per Rolls Royce Alert Service Bulletin Da73‑A86 and completed prior to 30 June 1993. The source text shows no amendment or broadening of applicability or obligations beyond that single inspection requirement (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow, specific applicability to a defined list of engine series (Applicability)","Single, one‑off action (inspect the fuel servo pipe) rather than ongoing regime (Requirement)","Reliance on an external technical document (Rolls Royce Alert Service Bulletin Da73‑A86) for the inspection procedure (Requirement)","Fixed compliance deadline concentrates scheduling needs for operators (Compliance)","No procedural detail or discretionary criteria included in the directive text (Requirement; Compliance)"],"plain_english_summary":"Requires a one‑time inspection of the fuel servo pipe between pump and fuel control on specified Rolls‑Royce Dart engines, to be done per Rolls‑Royce Alert Service Bulletin Da73‑A86. Affects owners/operators and maintenance staff of the listed Dart models.\n\nIssued after three reported fuel leaks to detect and address leakage risk; inspections must be completed by 30 June 1993 and are arranged and paid for by the operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dart-24-fuel-servo-pipe","history":"/api/acts/ad-dart-24-fuel-servo-pipe/history","analysis":"/api/acts/ad-dart-24-fuel-servo-pipe/analysis","conflicts":"/api/acts/ad-dart-24-fuel-servo-pipe/conflicts","importantCases":"/api/acts/ad-dart-24-fuel-servo-pipe/important-cases","documents":"/api/acts/ad-dart-24-fuel-servo-pipe/documents"}}