{"id":"F2005L00844","name":"AD/B747/327 - Engine Fuel Feed System Electrical Bonding","slug":"ad-b747-327-engine-fuel-feed-system-electrical-bonding","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":113185,"registerId":"commonwealth-F2005L00844-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/327 | Engine Fuel Feed System Electrical Bonding | 5/2005 |\n| ----------- | ------------------------------------------ | ------ |\n\n| Applicability: | Model 747 series aeroplanes as follows:                                                                                                                                                                                                |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|                | 747SP, 747SR, 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400,-400D, and -400F series aeroplanes listed in Boeing Alert Service Bulletin (ASB) 747-28A2239, Revision 1, dated 17 October 2002; and                          |\n|                | 747-400 and -400F series aeroplanes listed in Boeing ASB 747-28A2245, Revision 1, dated 21 August 2003.                                                                                                                                |\n| Requirement:   | 1. Action in accordance with paragraph 3.B. of ASB 747-28A2239, Revision 1 or ASB 747-28A2245, Revision 1, as applicable.                                                                                                              |\n|                | 2. Carry out any necessary corrective actions on deficiencies detected during the accomplishment of Requirement 1.                                                                                                                     |\n|                | Note 1: Operators may use their own CASA accepted equivalent procedures for draining the fuel tanks and gaining access to the fuel tanks.                                                                                              |\n|                | Note 2: Actions accomplished before the effective date of this Directive in accordance with Boeing ASB 747-28A2239 dated 29 November 2001 or ASB 747-28A2245 dated 26 November 2001 are acceptable for compliance with this Directive. |\n|                | Note 3: FAA AD 2005-04-01 Amdt 39-13973 refers.                                                                                                                                                                                        |\n| Compliance:    | For Requirement 1 - Before 12 May 2010.                                                                                                                                                                                                |\n|                | For Requirement 2 - Before further flight after accomplishing Requirement 1.                                                                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 12 May 2005.                                                                                                                                                                         |\n\n| Background: | The United States Federal Aviation Administration has determined that is necessary to reduce the potential for ignition sources inside fuel tanks. This Directive is issued to prevent arcing or sparking at the interface between the bulkhead fittings of the engine fuel feed tube and the front spar inside the fuel tank of the wings and between the overwing fuel fill ports and the aeroplane structure during a lightning strike. Such arcing or sparking could provide a possible ignition source for the fuel vapour inside the fuel tank and cause consequent fuel tank explosions. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n31 March 2005","sortOrder":0},{"sectionNumber":"AD/B747/327","sectionType":"part","heading":"AD/B747/327","content":"## AD/B747/327","sortOrder":1},{"sectionNumber":"Engine Fuel Feed System Electrical Bondi","sectionType":"part","heading":"Engine Fuel Feed System Electrical Bonding","content":"## Engine Fuel Feed System Electrical Bonding","sortOrder":2},{"sectionNumber":"5/2005","sectionType":"part","heading":"5/2005","content":"## 5/2005","sortOrder":3}],"analysis":{"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 AD maintains its original narrow scope — addressing a specific electrical bonding defect in Boeing 747 fuel systems. It does not expand beyond this safety-critical maintenance requirement."},"complexity_factors":["Short, single-purpose directive with only 2 substantive requirements","Heavy reliance on external documents (Boeing Service Bulletins) — the actual technical instructions are not reproduced in the AD itself","Multiple applicability categories requiring cross-referencing to two different Boeing bulletins","Simple conditional logic: 'if deficiencies found, fix before next flight'","Minimal defined terms (only standard aviation terminology like 'ASB' and 'AD')","Clear compliance dates with single deadline"],"plain_english_summary":"This AD orders operators of specified Boeing 747 models to inspect and, if needed, repair electrical bonding of engine fuel-feed fittings and tubes to the airframe to prevent arcing during lightning strikes that could ignite fuel vapour.  \n\nWork must follow the Boeing Alert Service Bulletins named in the AD, fix discrepancies before further flight, and complete the required inspection by 12 May 2010."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive implements the corrective actions specified in the cited Boeing Alert Service Bulletins and aligns with the FAA airworthiness directive referenced. It does not expand the set of affected components or aircraft beyond those listed in the ASBs, nor does it add new obligations beyond completing the inspections, bonding work and any corrective actions within the stated timeframes."},"complexity_factors":["Multiple affected model variants across two different Boeing Alert Service Bulletins (ASB 747-28A2239 Rev 1 and ASB 747-28A2245 Rev 1), increasing applicability tracking.","Technical nature of the work: electrical bonding inside fuel tanks, which requires draining tanks and safe access (operationally demanding and safety‑critical).","Requirement to perform corrective actions discovered during inspection; open‑ended repair scope can vary workload and parts needs per aircraft.","Compliance deadline (Requirement 1 before 12 May 2010) and 'before further flight' obligation for corrective work create scheduling and operational constraints.","Regulatory interaction: references to earlier Boeing ASBs and FAA AD 2005-04-01, so operators must reconcile multiple normative documents.","Regulator discretion: CASA acceptance of equivalent operator procedures for tank access introduces administrative review and recordkeeping obligations.","Effect on operators: direct compliance cost (maintenance labor, possible parts, downtime) and procedural decisions about using CASA‑accepted equivalents."],"plain_english_summary":"This directive requires operators of specified Boeing 747 models to carry out the electrical bonding work described in Boeing Alert Service Bulletins to prevent arcing between engine fuel feed fittings, overwing fill ports and the airframe. Operators must complete the mandated inspections and any corrective repairs by the stated deadline; CASA allows operator procedures it has accepted for tank drainage and access. The rule aims to reduce the risk of fuel‑tank ignition from lightning strikes by fixing bonding defects."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-327-engine-fuel-feed-system-electrical-bonding","history":"/api/acts/ad-b747-327-engine-fuel-feed-system-electrical-bonding/history","analysis":"/api/acts/ad-b747-327-engine-fuel-feed-system-electrical-bonding/analysis","conflicts":"/api/acts/ad-b747-327-engine-fuel-feed-system-electrical-bonding/conflicts","importantCases":"/api/acts/ad-b747-327-engine-fuel-feed-system-electrical-bonding/important-cases","documents":"/api/acts/ad-b747-327-engine-fuel-feed-system-electrical-bonding/documents"}}