{"id":"F2006B03131","name":"AD/B747/233 - Horizontal Stabiliser Fuel Tank Wire Bundles","slug":"ad-b747-233-horizontal-stabiliser-fuel-tank-wire-bundles","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42503,"registerId":"commonwealth-F2006B03131-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.002.png)\n\n![](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/B747/233 Horizontal Stabiliser Fuel T","sectionType":"part","heading":"AD/B747/233 Horizontal Stabiliser Fuel Tank Wire Bundles 10/2000","content":"# AD/B747/233 Horizontal Stabiliser Fuel Tank Wire Bundles 10/2000\n\nApplicability: Model 747-400 series aeroplanes having line numbers (L/N) 1162 through 1223, except L/N 1174; equipped with horizontal stabiliser fuel tanks.\n\nRequirement: 1. Perform a one-time detailed visual inspection in accordance with Boeing Alert Service Bulletin (ASB) 747-28A2232, Revision 1, dated 22 June 2000 of wire bundles routed to the fuel tank transfer pumps in the horizontal stabiliser to determine if wire bundles W4601 and W4602 are routed correctly and to detect damage. If the wire bundles are routed correctly and no damage is detected, no further action is required by this Directive.\n\n    2. If either wire bundle is determined to be incorrectly routed, but damage is not detected, reroute the affected wire bundle in accordance with the ASB.\n\n    3. If any damage is detected (whether the wire bundles are routed properly or not), repair the affected wire bundle and route the wire bundle correctly, as applicable, in accordance with the ASB.\n\nInspections and corrective actions accomplished prior to the effective date of this Directive in accordance with Boeing ASB 747-28A2232, dated 2 March 2000, are acceptable for compliance with the applicable action specified in this amendment.\n\nNote 1: For the purposes of this Directive, a detailed visual inspection is defined as: \"An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.\"\n\nNote 2: FAA AD 2000-15-02 Amdt 39-11831 refers.\n\nCompliance: For Requirement 1 \\- Within 60 days after the effective date of this Directive.\n\nFor Requirement 2 \\- Before further flight. For Requirement 3 \\- Before further flight.\n\nThis Airworthiness Directive becomes effective on 5 October 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains focused on the same wire bundles and limited set of 747-400 line numbers; the Directive codifies a one-time inspection and corrective steps and expressly accepts earlier inspections performed under the March 2, 2000 Boeing ASB, so it does not expand the population or actions beyond the original service bulletin framework."},"complexity_factors":["Narrow applicability: specific Boeing 747-400 line numbers (L/N 1162–1223 except 1174)","Dependence on an external service document (Boeing ASB 747-28A2232 Rev 1) for procedural details","Three outcome branches with different required actions (no action; reroute; repair and reroute)","Mandatory timing constraints: inspection within 60 days; corrective actions before further flight","Accepts prior compliance under an earlier ASB (administrative exception to deadline)","Technical inspection definition requires lighting, access, and inspection aids which can increase practical effort"],"plain_english_summary":"This Directive requires operators of certain Boeing 747-400s (L/N 1162–1223 except 1174) with horizontal stabiliser fuel tanks to perform a one-time detailed visual inspection of wire bundles W4601 and W4602 per Boeing ASB 747-28A2232 Rev 1; if bundles are misrouted or damaged they must be rerouted or repaired before further flight. Inspections are due within 60 days. Aircraft operators bear inspection and repair costs and must adjust maintenance schedules; the stated aim is to correct an identified unsafe wiring condition."},"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":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose. It has not expanded beyond its original intent of addressing a particular wiring defect in specific aircraft."},"complexity_factors":["Short, single-purpose directive with only 3 requirements","Clear conditional logic (if-then structure) with only 3 branches","Single defined term ('detailed visual inspection' in Note 1)","One external cross-reference (to Boeing Alert Service Bulletin 747-28A2232)","Limited applicability criteria (specific line numbers plus equipment requirement)","No nested exceptions or sub-delegations"],"plain_english_summary":"This CASA safety order requires owners/operators of Boeing 747-400s (line numbers 1162–1223, except 1174) with horizontal‑stabiliser fuel tanks to urgently inspect wiring bundles W4601/W4602 in the rear tank. Within 60 days of the directive (5 Oct 2000) they must visually inspect, reroute incorrect but undamaged wires, and repair any damage before further flight. The measure addresses a fire/explosion risk from chafed or misrouted wiring in the fuel tank."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-233-horizontal-stabiliser-fuel-tank-wire-bundles","history":"/api/acts/ad-b747-233-horizontal-stabiliser-fuel-tank-wire-bundles/history","analysis":"/api/acts/ad-b747-233-horizontal-stabiliser-fuel-tank-wire-bundles/analysis","conflicts":"/api/acts/ad-b747-233-horizontal-stabiliser-fuel-tank-wire-bundles/conflicts","importantCases":"/api/acts/ad-b747-233-horizontal-stabiliser-fuel-tank-wire-bundles/important-cases","documents":"/api/acts/ad-b747-233-horizontal-stabiliser-fuel-tank-wire-bundles/documents"}}