{"id":"F2006B02316","name":"AD/ALF/20 - Flow Divider Fuel Tube - Inspection","slug":"ad-alf-20-flow-divider-fuel-tube-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41546,"registerId":"commonwealth-F2006B02316-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAllied Signal (Lycoming) Turbine Engines \\- ALF502 and LF507 Series","sortOrder":0},{"sectionNumber":"AD/ALF/20 Flow Divider Fuel Tube - Inspe","sectionType":"part","heading":"AD/ALF/20 Flow Divider Fuel Tube - Inspection 3/2003","content":"# AD/ALF/20 Flow Divider Fuel Tube \\- Inspection 3/2003\n\nDM\n\nApplicability: Honeywell ALF502 Series engines as identified in the Requirement Document. Requirement: Carry out inspection as detailed in FAA AD 2003-02-01, Amdt 39-13017.\n\nCompliance: Within 100 flight hours after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 29 January 2003.\n\nBackground: Inadequate clamping resulted in fatigue failure of primary fuel supply tube on an ALF502 engine causing engine fire. This Directive mandates an inspection to ensure that fuel tubes are clamped per the design requirements.\n\n![](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 24 January 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive applies to ALF502-series engines identified in the Requirement Document and mandates inspection per FAA AD 2003-02-01 to address a clamp-related fatigue failure and fire risk. The text gives no indication that the applicability or substantive scope was changed from the stated remedial purpose."},"complexity_factors":["Cross-reference to an external FAA AD (FAA AD 2003-02-01) requiring users to consult another instrument for detailed instructions","Applicability limited to ALF502-series engines 'as identified in the Requirement Document' — requires locating and matching that document","Short compliance window (within 100 flight hours) creates operational scheduling pressure","Technical nature of inspection requires qualified maintenance personnel and potential corrective actions","Regulatory enforcement by CASA delegate is straightforward but leaves little operational discretion to operators"],"plain_english_summary":"This Directive requires operators of Honeywell ALF502-series engines (as identified in the Requirement Document) to inspect the flow-divider fuel tube per FAA AD 2003-02-01 within 100 flight hours of the Directive (effective 29 January 2003). CASA issued it after inadequate clamping led to a fuel-tube fatigue failure and engine fire. Operators must carry out the FAA-prescribed inspection and any corrective work, bearing inspection and maintenance costs and any aircraft downtime while complying."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating one specific inspection."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term (Requirement Document, implicitly referenced)","Single, clear compliance action (one inspection)","No nested exceptions or conditional logic","Cross-reference to external FAA document but incorporated by simple citation","Straightforward applicability (specific engine series only)"],"plain_english_summary":"Owners/operators of Honeywell ALF502 series engines must inspect the flow divider fuel tube within 100 flight hours (after 29 Jan 2003) to verify proper clamping. This mandatory AD follows an engine fire caused by tube fracture from metal fatigue and inadequate clamp retention. Comply with the inspection instructions in FAA AD 2003-02-01 to prevent potential engine fires."}},"importantCases":[],"_links":{"self":"/api/acts/ad-alf-20-flow-divider-fuel-tube-inspection","history":"/api/acts/ad-alf-20-flow-divider-fuel-tube-inspection/history","analysis":"/api/acts/ad-alf-20-flow-divider-fuel-tube-inspection/analysis","conflicts":"/api/acts/ad-alf-20-flow-divider-fuel-tube-inspection/conflicts","importantCases":"/api/acts/ad-alf-20-flow-divider-fuel-tube-inspection/important-cases","documents":"/api/acts/ad-alf-20-flow-divider-fuel-tube-inspection/documents"}}