{"id":"F2006B07007","name":"AD/SF340/77 - Refuel/Defuel Panel Electrical Arcing","slug":"ad-sf340-77-refuel-defuel-panel-electrical-arcing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48643,"registerId":"commonwealth-F2006B07007-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.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/SF340/77 Refuel/Defuel Panel Electric","sectionType":"part","heading":"AD/SF340/77 Refuel/Defuel Panel Electrical Arcing 5/2000","content":"# AD/SF340/77 Refuel/Defuel Panel Electrical Arcing 5/2000\n\nApplicability: Model SF340A aeroplanes, serial numbers (S/N) 004 through 159 inclusive and Model 340B aeroplanes, S/N 160 through 459 inclusive, with Refuel/Defuel Panel Part Number 7239160-505 installed.\n\nRequirement: Inspect the Fuel/Defuel Panel for evidence of moisture ingress and electrical arcing in accordance with SAAB Aircraft AB Mandatory Service Bulletin (SB) SAAB 340-28- 022 dated 25 February 2000. If evidence of moisture ingress or arcing is found carry out the corrective actions specified in SB SAAB 340-28-022, if no evidence is found seal the appropriate areas as specified in the service bulletin.\n\nNote: LFV AD 1-156 refers.\n\nCompliance: Within six months from the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 18 May 2000.\n\nBackground: The Swedish Civil Aviation Administration has advised that electrical short circuits and arcing can occur at the illuminated placard connector at the wing Fuel/Defuel Panel. These shorts are caused by fluid ingress through the mounting hole. The illuminated placard is only supplied with 28VDC power when the Refuel/Defuel Panel switch is selected to on, this occurs when the aircraft is on the ground during refuelling or de-fuelling. Electrical arcing at the Refuel/Defuel Panel illuminated placard connector offers a potential ignition source for fuel vapours during refuelling or de-fuelling.\n\nThis Directive requires inspection of the panel for moisture ingress and electrical arcing, sealing of the panel and, if necessary, repair of any damaged areas.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 5 April 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 April 2000.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific unsafe condition in a specific aircraft component. There is no evidence of scope creep; the directive precisely targets the electrical arcing risk in the Refuel/Defuel Panel of specified Saab 340 aircraft."},"complexity_factors":["Single, clearly defined applicability criteria (specific aircraft models and serial number ranges)","Straightforward two-path requirement: inspect, then either repair (if problem found) or seal (if no problem)","Only one cross-reference to external document (Swedish service bulletin SAAB 340-28-022)","Single compliance deadline with no conditional timing","No defined terms section, no nested exceptions, no interpretive provisions","Background section provides clear safety rationale without legal complexity"],"plain_english_summary":"This CASA safety order requires operators of certain Saab 340A (s/n 004–159) and 340B (s/n 160–459) equipped with Refuel/Defuel Panel P/N 7239160‑505 to inspect the panel for moisture ingress and electrical arcing, repair any defects per Saab instructions, and seal the panel if no defects are found.\n\nIt responds to a risk of sparks during ground refuelling that could ignite fuel; actions were to be completed within six months of 18 May 2000."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive stays within the original, stated purpose: address electrical arcing risk at the Refuel/Defuel Panel on a defined subset of SAAB 340 aircraft. It does not expand beyond inspecting, sealing and repairing that panel as specified in the SAAB service bulletin, nor does it add unrelated obligations or wider fleet coverage."},"complexity_factors":["Short standalone Airworthiness Directive with limited scope and a single conditional action","Applicability defined by two narrow serial-number ranges and a single part number (clear scope limits)","Direct cross-reference to an external mandatory service bulletin (SAAB 340-28-022) for procedure details","One compliance deadline (within six months) and a single inspection/repair branch (if defect found = repair; if not = seal)","Reference to another regulator's AD (LFV AD 1-156), adding a minor cross-jurisdictional reference","No multiple nested exceptions or staged compliance requirements"],"plain_english_summary":"**What this directive does (mechanical change)\n\n- Requires operators of certain SAAB 340 aeroplanes to inspect the wing Refuel/Defuel Panel (the illuminated placard connector area) for moisture ingress and electrical arcing, following the steps in SAAB Mandatory Service Bulletin SAAB 340-28-022 (dated 25 February 2000).\n- If moisture or arcing damage is found, the operator must carry out the corrective repairs specified in that service bulletin. If no damage is found, the operator must seal the specified areas as described in the service bulletin.\n- Applies to SAAB SF340A aeroplanes, serial numbers 004–159 inclusive, and SAAB 340B aeroplanes, serial numbers 160–459 inclusive, but only when Refuel/Defuel Panel Part Number 7239160-505 is installed.\n- Compliance must be completed within six months from the Directive's effective date (this AD became effective 18 May 2000).\n\nWhy the rule was issued (stated reason)\n\n- The Swedish Civil Aviation Administration reported that fluid (moisture) can enter the Refuel/Defuel Panel through a mounting hole and cause short circuits and electrical arcing at the illuminated placard connector. The placard is powered (28 V DC) while the Refuel/Defuel Panel switch is ON during ground refuelling/defuelling. Arcing in the presence of fuel vapour could provide an ignition source.\n\nWho is affected\n\n- Aircraft owners/operators and maintenance organisations responsible for the listed SAAB 340 serial numbers with the specified Refuel/Defuel Panel installed. The directive imposes a maintenance action spread across this defined fleet subset; it does not apply to aircraft without that part number or outside the serial-number ranges.\n\nHow it works in practice\n\n- The operator arranges for a maintenance inspection carried out in accordance with the referenced SAAB Mandatory Service Bulletin. The service bulletin contains the inspection steps, sealing instructions and repair procedures. After inspection:\n  - If moisture ingress or arcing damage is found: carry out the repair actions specified in the service bulletin.\n  - If nothing is found: apply the sealing specified in the service bulletin.\n- The CASA delegate (the regulator) issued the Directive under the airworthiness regulations; compliance is a regulatory requirement.\n\nCosts, incentives and implementation notes (analyst's lens)\n\n- Who pays: the aircraft operator/owner pays for inspection labour, parts and any repairs. Maintenance organisations performing the work will charge standard shop rates unless covered under a warranty or support agreement.\n- Who decides: the regulator requires the action; the exact method and timing of carrying it out is decided by the operator within the six-month compliance window, subject to following the SAAB service bulletin instructions.\n- Behaviour changes: operators must schedule and prioritise an inspection and either sealing or repair; this may shift maintenance slots and short-term aircraft availability.\n- Compliance burden: modest on a per-aircraft basis — an inspection plus possible sealing or repair — but aggregate burden scales with fleet size affected. The directive specifies an existing manufacturer service bulletin rather than prescribing a bespoke method, which channels work to procedures already published by SAAB.\n- Trade-offs and opportunity costs: operators forego some maintenance capacity and incur direct costs to reduce a low-probability but high-consequence ignition risk during refuelling. If an operator delays, they retain aircraft availability but run regulatory and safety risk.\n- Implementation risk: depends on availability of parts, qualified technicians and correct application of the service bulletin. Incorrect sealing or repair could leave the hazard unmitigated.\n- Effects on market/firms: independent maintenance providers can perform the mandated work so long as they follow the service bulletin and hold appropriate approvals; the directive does not itself restrict who may carry out the work.\n- Concentrated benefits/diffuse costs: the immediate safety benefit accrues to aircraft, crew and ground personnel (concentrated on the operator and airline), while the cost is directly borne by those same operators; there is no evident transfer of benefits to unrelated parties.\n\nReference links inside the Directive\n\n- The Directive mandates compliance with SAAB Mandatory Service Bulletin SAAB 340-28-022 (25 Feb 2000) and notes a related LFV (Swedish) AD. The Directive relies on those external documents to define inspection and repair details. (This AD text itself sets the applicability, the compliance time and the regulator's requirement to follow the service bulletin.)\n\nBottom line\n\n- The AD requires operators of the specified SAAB 340 aircraft with the listed panel installed to inspect and, if necessary, repair or seal the Refuel/Defuel Panel to remove a potential ignition source during refuelling, with actions to be completed within six months of the Directive taking effect (18 May 2000)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-77-refuel-defuel-panel-electrical-arcing","history":"/api/acts/ad-sf340-77-refuel-defuel-panel-electrical-arcing/history","analysis":"/api/acts/ad-sf340-77-refuel-defuel-panel-electrical-arcing/analysis","conflicts":"/api/acts/ad-sf340-77-refuel-defuel-panel-electrical-arcing/conflicts","importantCases":"/api/acts/ad-sf340-77-refuel-defuel-panel-electrical-arcing/important-cases","documents":"/api/acts/ad-sf340-77-refuel-defuel-panel-electrical-arcing/documents"}}