{"id":"F2006B03444","name":"AD/B767/91 - Fuel Transfer Tube Leakage Modification","slug":"ad-b767-91-fuel-transfer-tube-leakage-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42998,"registerId":"commonwealth-F2006B03444-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/91 - Fuel Transfer Tube Leakage Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 767 Series Aeroplanes\n\nAD/B767/91 Fuel Transfer Tube Leakage Modification 12/96\n\nApplicability: All Boeing 767 series aircraft, line position 1 - 329 (incl) equipped with Pratt & Whitney JT9D-7R4 series engines. The Airplane Variable Number, Line Number, and Serial Number Data are as shown in Boeing Service Bulletin 767-71A0082 dated Jul 6/95.\n\nRequirement: To prevent chafing of the number 18 fuel nozzle, two clamps are installed between the pylon drain tube and the ECS controller tube in accordance with Boeing Alert Service Bulletin 767-71A0082.\n\nNote: FAA Airworthiness Directive 96-14-02 refers.\n\nCompliance: Within six months of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 7 November 1996.\n\nBackground: Two operators have reported chafing of the number 18 fuel nozzle secondary transfer fuel tube, resulting in \"heavy\" fuel leakage in one case and an engine fire in another. In one case (the fire), chafing was due to an installation of the wrong engine fuel manifold. In the other case the chafing was due to an improperly installed or loose pylon drain tube which contacted the number 18 fuel nozzle. The fuel tube chafing can be prevented by the installation of clamps on the ECS controller tube and the pylon drain tube as shown in the Boeing Service Bulletin. This Directive requires a one off inspection of the clearance between the engine fuel manifold and pylon drain line and the fitment of clamps to prevent chafing between the two pipes.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive addressing a specific safety defect in specific aircraft. It has not expanded beyond its original purpose of preventing fuel tube chafing."},"complexity_factors":["Single, specific technical requirement (install two clamps)","Limited applicability (one aircraft series, specific engine type, specific production line numbers)","No defined terms section","No cross-references to other legislation (only references to Boeing technical documents and FAA directive)","Simple compliance deadline (six months from effective date)","Straightforward background explanation with clear causal chain"],"plain_english_summary":"This is a safety order for specific Boeing 767 aircraft. It requires airlines to install two clamps on certain fuel pipes to stop them rubbing together and causing fuel leaks or engine fires. The affected planes are Boeing 767s with Pratt & Whitney JT9D-7R4 engines, specifically those built at line positions 1 through 329. Airlines must complete this modification within six months of 7 November 1996. The order was issued after two incidents: one where a fuel leak caused an engine fire, and another with heavy fuel leakage. Both were caused by pipes rubbing against each other due to improper installation."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains a targeted corrective measure limited to a defined subset of Boeing 767s with JT9D‑7R4 engines. The Directive mandates a one‑off inspection and clamp installation per the Boeing service bulletin within a fixed six‑month window; it does not broaden to other models, engines, or recurring obligations."},"complexity_factors":["Narrow technical scope: applies only to Boeing 767 line positions 1–329 with JT9D‑7R4 engines (Applicability).","Clear, single remedial action: install two clamps between the pylon drain tube and ECS controller tube (Requirement).","Mandatory compliance timeframe: completes action within six months of the Directive (Compliance) — creates a short, fixed scheduling window for operators.","Dependence on external service instructions: work must be done in accordance with Boeing Alert Service Bulletin 767‑71A0082 (Requirement/Applicability).","Safety-driven origin: based on two operator reports of fuel-tube chafing, one causing an engine fire (Background) — evidentiary basis is limited but concrete.","Low regulatory discretion: issued as an Airworthiness Directive under Part 39, so operators must comply rather than choose between options (Directive nature).","Operational cost and logistics: inspection and clamp installation impose labour, downtime and parts costs on affected operators (Requirement/Compliance).","Traceability burden: applicability is tied to specific line/serial numbers listed in the Boeing service bulletin, requiring record checks (Applicability)."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 767 aircraft fitted with Pratt & Whitney JT9D‑7R4 engines to inspect the clearance around the No.18 fuel nozzle and fit two clamps between the pylon drain tube and the ECS controller tube, per Boeing Service Bulletin 767‑71A0082. It matters because chafing of the transfer tube has caused fuel leaks and at least one engine fire; operators must complete the inspection and clamp installation within six months, bearing the cost and scheduling the work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-91-fuel-transfer-tube-leakage-modification","history":"/api/acts/ad-b767-91-fuel-transfer-tube-leakage-modification/history","analysis":"/api/acts/ad-b767-91-fuel-transfer-tube-leakage-modification/analysis","conflicts":"/api/acts/ad-b767-91-fuel-transfer-tube-leakage-modification/conflicts","importantCases":"/api/acts/ad-b767-91-fuel-transfer-tube-leakage-modification/important-cases","documents":"/api/acts/ad-b767-91-fuel-transfer-tube-leakage-modification/documents"}}