{"id":"F2007L03963","name":"AD/SF340/104 - Fuel Tank Conduits Wiring Protection","slug":"ad-sf340-104-fuel-tank-conduits-wiring-protection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70661,"registerId":"commonwealth-F2007L03963-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"SAAB SF340 Series Aeroplanes","sectionType":"division","heading":"SAAB SF340 Series Aeroplanes","content":"### SAAB SF340 Series Aeroplanes\n\n| AD/SF340/104 | Fuel Tank Conduits Wiring Protection | 11/2007 |\n| ------------ | ------------------------------------ | ------- |\n\n| Applicability: | Model SF340A and 340B aircraft, all serial numbers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless previously accomplished, perform Modifications 3164 (Right Hand Wing) and 3165 (Left Hand Wing) in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision. The modifications include:                                                                                                                                                                                                                                                                                                                                                                                                |\n|                | - Removal of the fuel pumps 5QM and 6QM, the fuel Switches 31EB, 32EB, 9QA, 10QA, 11QA and 12QA and the refuel shutoff valves 15QA and 16QA;- Inspection of the wiring to the fuel pumps, fuel level switches and the refuel shut off valves;- Twisting of the fuel pump wiring, fuel level switches wiring and refuel shutoff valves wiring;- Installation of a shrinkable tube to the fuel pump wiring, fuel level switches wiring and refuel shutoff valve wiring;- Installation of fuel pumps, the fuel level switches and the refuel shutoff valves; and- Operational and Functional test of the fuel Measuring/Indicating system. |\n|                | Note: EASA AD 2007-0248 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Compliance:    | Within 72 months after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 25 October 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | Subsequent to accidents involving Fuel Tank System explosions in flight (Boeing 747-131 flight TWA800) and on ground, the United States Federal Aviation Administration (FAA) published Special Federal Aviation Regulation 88 (SFAR88) in June 2001.In their Letters referenced 04/00/02/07/01-L296 dated 4 March 2002 and 04/00/02/07/03-L024, dated 3 February 2003, the European Joint Airworthiness Authority (JAA) recommended the application of a similar regulation to the National Aviation Authorities (NAA).                                                                                                                |\n\n|     | Under this regulation, all holders of type certificates for passenger transport aircraft with either a passenger capacity of 30 or more, or a payload capacity of 7 500 pounds (3 402 kg) or more, which have received their certification since 1 January 1958, are required to conduct a design review against explosion risks.As a consequence of the design review mentioned above, this Airworthiness Directive requires a modification to install extra protection of wiring installed in fuel tank conduits. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n14 September 2007","sortOrder":0},{"sectionNumber":"AD/SF340/104","sectionType":"part","heading":"AD/SF340/104","content":"## AD/SF340/104","sortOrder":1},{"sectionNumber":"Fuel Tank Conduits Wiring Protection","sectionType":"part","heading":"Fuel Tank Conduits Wiring Protection","content":"## Fuel Tank Conduits Wiring Protection","sortOrder":2},{"sectionNumber":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive implementing international safety standards. The scope remains tightly focused on the specific wiring modification required for fuel tank safety on SAAB SF340 aircraft, consistent with the original intent following the TWA 800 accident investigation recommendations."},"complexity_factors":["Single, specific technical requirement with clear reference to manufacturer service bulletin (SAAB SB 340-28-026)","Straightforward applicability (two specific aircraft models, all serial numbers)","Single compliance deadline (72 months from effective date)","Contains technical aviation terminology but references external standard for actual procedure","No nested exceptions, conditional clauses, or alternative compliance methods","Short document with minimal cross-referencing (only references EASA AD 2007-0248 and SFAR88 background)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners and operators of all SAAB SF340A and 340B aircraft (and their maintenance organisations) to modify fuel-tank wiring—removing pumps/valves, inspecting and rewiring connections, adding protective tubing, then reinstalling and testing—within 72 months of October 2007. \n\nIt implements post–TWA Flight 800 safety recommendations to prevent fuel-tank ignition; non-compliance grounds the aircraft."},"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This Directive implements the design‑review requirement arising from SFAR88/JAA guidance by mandating wiring protection modifications for SF340A/B aircraft. It does not expand applicability beyond those models or add new subject matter beyond the fuel tank wiring protections described in the Background and Requirement sections (Background; Applicability; Requirement)."},"complexity_factors":["Technical scope: multiple coordinated physical tasks (removal, inspection, twisting, shrinkable tube installation, reinstallation, and operational/functional testing) create technical and shop-floor complexity (Requirement).","Reference to external documents: mandates compliance with SAAB Service Bulletin 340-28-026 or a later EASA-approved revision and cross-references EASA AD 2007-0248, requiring alignment with external approvals (Requirement; Note).","Applicability: applies to all SF340A and 340B aircraft, all serial numbers, producing universal operator coverage and no carve-outs (Applicability).","Compliance timeframe: a 72-month window to complete work affects maintenance scheduling, aircraft downtime and budgeting (Compliance).","Who pays and who acts: aircraft owners/operators and contracted maintenance organisations bear costs and perform the modifications (Applicability; Requirement).","Regulatory origin and mandate: issued to implement design-review outcomes prompted by SFAR88/JAA letters on fuel tank explosion risk, linking this AD to broader regulatory obligations (Background).","Limited discretion: prescribes a specific service bulletin but allows later EASA-approved revisions, permitting only constrained substitution of approved technical method (Requirement).","Operational validation: requires functional testing of the fuel measuring/indicating system, adding certification/verification steps post-modification (Requirement).","Inter-agency approval interactions: reliance on EASA approval of SB revisions introduces coordination and possible administrative delay/risk (Requirement; Note)."],"plain_english_summary":"This Airworthiness Directive requires every SAAB SF340A and 340B aircraft to have wiring in fuel tank conduits modified to reduce ignition risk, following SAAB Service Bulletin 340-28-026 (or a later EASA‑approved revision). The work includes removal, inspection, twisting, shrink‑tubing, reinstallation of pumps/switches/valves and functional testing, and must be completed within 72 months. It affects aircraft owners/operators and maintenance organisations because they must fund and carry out the technical modifications to maintain airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-104-fuel-tank-conduits-wiring-protection","history":"/api/acts/ad-sf340-104-fuel-tank-conduits-wiring-protection/history","analysis":"/api/acts/ad-sf340-104-fuel-tank-conduits-wiring-protection/analysis","conflicts":"/api/acts/ad-sf340-104-fuel-tank-conduits-wiring-protection/conflicts","importantCases":"/api/acts/ad-sf340-104-fuel-tank-conduits-wiring-protection/important-cases","documents":"/api/acts/ad-sf340-104-fuel-tank-conduits-wiring-protection/documents"}}