{"id":"F2006B09829","name":"AD/F406/4 - Engine Fuel Lines","slug":"ad-f406-4-engine-fuel-lines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54851,"registerId":"commonwealth-F2006B09829-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.003.png)![](image.002.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.","sortOrder":0},{"sectionNumber":"AD/F406/4 Engine Fuel Lines 6/2001 TX","sectionType":"part","heading":"AD/F406/4 Engine Fuel Lines 6/2001 TX","content":"# AD/F406/4 Engine Fuel Lines 6/2001 TX\n\nApplicability: Reims F406 aircraft, serial numbers F406-0001 to F406-0086\n\nRequirement: 1. Inspect fuel lines, P/N AE 7013108 H 0155 and AE 7013108 G 0105, in accordance with REIMS AVIATION Service Bulletin CAB01-6 dated 26 March 2001. The affected fuel lines are located between the firewall and the engine.\n\nIf the nuts on the end of the fuel lines are black or grey in colour, no further action is required. Make on appropriate entry in the aircraft log book and release the aircraft to service.\n\nIf the nuts are blue or yellow in colour, comply with Requirement 2 of this Directive.\n\n2 (a). For fuel lines with end nuts that are blue or yellow in colour, inspect the nuts for cracks in accordance with REIMS AVIATION Service Bulletin CAB01-6 dated 26 March 2001.\n\nIf a nut is found cracked the affected fuel line must be replaced with a serviceable fuel line of the correct type before further flight.\n\n2 (b). Replace fuels lines that have end nuts that are blue or yellow in colour.\n\nNote: DGAC AD 2001-131(A) refers.\n\nCompliance: 1. Unless previously accomplished, before further flight after the effective date of this Airworthiness Directive.\n\n2 (a). Unless previously accomplished, before further flight after the effective date of this Airworthiness Directive and thereafter at intervals not to exceed 20 flying hours.\n\n2 (b). Within 30 days of the effective date of this Airworthiness Directive.\n\nInstallation of fuel lines of the correct type constitutes terminating action for this Airworthiness Directive.\n\nThis Airworthiness Directive becomes effective on 14 April 2001.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive confines action to specified Reims F406 serials and two fuel-line part numbers and prescribes inspection, crack-checking and replacement with clear compliance timing (Applicability; Requirement; Compliance). The measures align with addressing the identified unsafe condition and do not broaden scope beyond those aircraft, parts and remedial steps set out in the AD."},"complexity_factors":["Narrow applicability: only Reims F406 serial numbers F406-0001 to F406-0086 (Applicability).","Specific parts identified by part numbers AE 7013108 H 0155 and AE 7013108 G 0105 (Requirement 1).","Simple visual criterion based on nut colour (black/grey versus blue/yellow) to trigger actions (Requirement 1 and 2).","Two-tiered actions: immediate inspection, crack checks, mandatory replacement for some items (Requirements 1, 2(a), 2(b)).","Short compliance windows and a recurring inspection interval of 20 flying hours for affected lines (Compliance).","Use of an external Service Bulletin (REIMS AVIATION CAB01-6 dated 26 March 2001) for inspection method (Requirement references).","Recordkeeping obligation to log results and release aircraft to service (Requirement 1).","Terminating action defined by installation of correct fuel lines (Compliance)."],"plain_english_summary":"This Airworthiness Directive orders operators of Reims F406 aircraft (serials F406-0001 to F406-0086) to inspect specific engine fuel lines and their end nuts, and to replace any with cracked or specified-colour nuts. It sets immediate compliance deadlines, a short recurring inspection interval for affected lines, and allows installing correct replacement lines to end the requirement. The aircraft owner/operator pays for inspections, repairs and downtime; the CASA delegate issues the AD and the Reims service bulletin provides the inspection method."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific unsafe condition identified in particular fuel lines on specific Reims F406 aircraft. The directive does not expand beyond its original safety purpose of correcting a known defect in identified aircraft components."},"complexity_factors":["Simple conditional logic based on nut colour (black/grey vs blue/yellow)","Two distinct compliance timelines: immediate (before further flight) and 30-day deadline","Ongoing recurring inspection requirement (every 20 flying hours) for affected components","Cross-reference to external technical document (REIMS AVIATION Service Bulletin CAB01-6) for detailed inspection procedures","Limited applicability scope (specific aircraft model and serial number range)","Reference to French aviation authority directive (DGAC AD 2001-131(A)) as related information"],"plain_english_summary":"CASA has issued a safety order for Reims F406 aircraft (S/N F406-0001 to F406-0086) to address unsafe fuel lines between the firewall and engine. Owners/operators must inspect the fuel-line nuts: black/grey nuts are acceptable and just logged; blue or yellow nuts require preflight and every-20-hour checks, replacement of the line within 30 days, and grounding if a nut is found cracked. The rule prevents fuel leaks, fire risk, and engine failure until corrected."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f406-4-engine-fuel-lines","history":"/api/acts/ad-f406-4-engine-fuel-lines/history","analysis":"/api/acts/ad-f406-4-engine-fuel-lines/analysis","conflicts":"/api/acts/ad-f406-4-engine-fuel-lines/conflicts","importantCases":"/api/acts/ad-f406-4-engine-fuel-lines/important-cases","documents":"/api/acts/ad-f406-4-engine-fuel-lines/documents"}}