{"id":"F2006B06939","name":"AD/SF340/10 - Fuel System Optical Sensor Bonding","slug":"ad-sf340-10-fuel-system-optical-sensor-bonding","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114830,"registerId":"commonwealth-F2006B06939-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/10 - Fuel System Optical Sensor Bonding","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  SAAB SF340 Series Aeroplanes\n\n \n\nAD/SF340/10 Fuel System Optical Sensor Bonding 8/88\n\nApplicability: SAAB SF 340 aircraft S/No’s -004 through -106.\n\n \n\nRequirement: Action in accordance with SAAB Service Bulletin SF340-28-006.\n\n \n\nNote: Swedish Airworthiness Directive SAD No 1-025 refers.\n\n \n\nCompliance: Prior to 6 October 1988.\n\n \n\nBackground: SAAB have advised that they have discovered that in some aircraft the fitting of a jumper assembly on the mid level and tank full optical sensors has been omitted. If not corrected, this could create a hazardous situation if a lightning strike occurs.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific manufacturing defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a wiring fix to prevent lightning-induced fuel tank hazards."},"complexity_factors":["Very short document (under 200 words)","Only 1 substantive requirement (comply with referenced service bulletin)","No defined terms section","No cross-references to other legislation beyond a single note about a Swedish directive","Simple conditional logic: applies only to specific serial numbers, single compliance action required","Single deadline with no exceptions or alternative compliance methods"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:** It requires owners or operators of specific SAAB SF 340 aircraft (serial numbers -004 through -106) to fix a wiring problem in the fuel system. Specifically, they must install a missing \"jumper assembly\" (a short electrical connection) on two sensors in the fuel tanks: the mid-level sensor and the tank-full sensor.\n\n**Why it matters:** Without this jumper, the sensors aren't properly electrically bonded (connected to the aircraft's frame). This creates a serious fire risk if the aircraft is struck by lightning — electricity could arc or spark inside the fuel tank, with potentially catastrophic consequences.\n\n**Who must act:** Anyone operating the affected SAAB SF 340 aircraft (a regional turboprop airliner).\n\n**What they must do:** Follow the instructions in SAAB Service Bulletin SF340-28-006 to install the missing parts.\n\n**Deadline:** Before 6 October 1988."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive does not expand or alter the population of affected aircraft beyond those listed (S/No’s -004 through -106) and does not change regulatory powers; it prescribes a corrective maintenance action to be carried out in accordance with a specified SAAB service bulletin by a set compliance date. There is no indication in the text that the directive broadened or narrowed scope from the original safety concern beyond identifying the affected serial numbers and the remedial action (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability to a specific set of serial-numbered aircraft (Applicability)","Single, discrete corrective action referenced to an external document (SAAB Service Bulletin SF340-28-006) rather than detailed steps in the directive (Requirement)","Fixed and past compliance date, creating a clear, time-bound obligation (Compliance)","Technical nature of the work (electrical jumper on optical fuel sensors) requiring qualified maintenance personnel and possible parts procurement (Requirement; Background)","Regulator relies on manufacturer documentation and an external foreign AD as cross-reference, adding dependency on outside documents (Requirement; Note)"],"plain_english_summary":"This directive requires owners/operators of SAAB SF340 aeroplanes (serials -004 through -106) to have a small electrical jumper fitted to the mid‑level and tank‑full fuel‑level optical sensors, performed exactly per SAAB Service Bulletin SF340‑28‑006, to prevent hazardous lightning effects on the fuel‑sensing system. Maintenance organisations must carry out and operators pay for the one‑off retrofit; compliance was required by 6 October 1988."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-10-fuel-system-optical-sensor-bonding","history":"/api/acts/ad-sf340-10-fuel-system-optical-sensor-bonding/history","analysis":"/api/acts/ad-sf340-10-fuel-system-optical-sensor-bonding/analysis","conflicts":"/api/acts/ad-sf340-10-fuel-system-optical-sensor-bonding/conflicts","importantCases":"/api/acts/ad-sf340-10-fuel-system-optical-sensor-bonding/important-cases","documents":"/api/acts/ad-sf340-10-fuel-system-optical-sensor-bonding/documents"}}