{"id":"F2006B06965","name":"AD/SF340/36 - Sensor Loops","slug":"ad-sf340-36-sensor-loops","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114869,"registerId":"commonwealth-F2006B06965-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/36 - Sensor Loops","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/SF340/36 Sensor Loops 11/92\n\nApplicability: All model SF340 S/N SF340A-004 thru 159 and S/N340B-160 thru 339 inclusive.\n\n \n\nRequirement: Action in accordance with SAAB Service Bulletin 340-36-006 which supersedes and cancels SAAB Service Bulletin 340-36-005.\n\n \n\nNote: Swedish Airworthiness Directive SAD No. 1-054 refers and supersedes SAD No. 1-053.\n\n \n\nCompliance: Prior to 1 January 1993.\n\n \n\nBackground:  Failure to relocate the sensor loops could result in a bleed air system hot air leak going undetected. If the leak continued, a reduction of structural integrity due to damage/disbonding of the fuselage skin could occur.\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 with a single purpose: mandating a specific hardware modification to address a known safety defect. It has not expanded beyond its original intent."},"complexity_factors":["Single, specific technical requirement (relocate sensor loops per referenced service bulletin)","No defined terms section — relies entirely on external technical document (SAAB Service Bulletin)","Simple applicability test based on aircraft serial numbers only","No conditional logic, exceptions, or nested provisions","Single compliance date with no alternative methods or phased implementation","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific SAAB SF340 aircraft.\n\n**What it does:** It requires owners and operators of certain SAAB SF340 aeroplanes to relocate \"sensor loops\" (temperature detection cables that monitor for hot air leaks) according to instructions in SAAB Service Bulletin 340-36-006. This service bulletin replaced an earlier version (340-36-005).\n\n**Who it affects:** All SAAB SF340 aircraft with serial numbers SF340A-004 through 159, and SF340B-160 through 339.\n\n**Why it matters:** If the sensor loops aren't moved to the correct position, the aircraft's bleed air system (which supplies hot compressed air for cabin heating and other systems) could leak hot air without triggering any warning. This undetected leak could eventually damage or separate the fuselage skin, compromising the aircraft's structural integrity and potentially endangering passengers and crew.\n\n**The deadline:** Aircraft operators had to complete this fix before 1 January 1993."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive requires action in accordance with Saab Service Bulletin 340-36-006 which supersedes and cancels the earlier Service Bulletin 340-36-005 (Requirement). The AD also notes that Swedish Airworthiness Directive SAD No. 1-054 refers to and supersedes SAD No. 1-053 (Note). Taken together, the AD updates the mandated technical document and supersedes prior guidance, so the operative scope and specified procedure have changed from the earlier service bulletin/AD chain."},"complexity_factors":["Narrow applicability defined by discrete serial-number ranges (Applicability).","Mandated compliance by reference to a manufacturer Service Bulletin (340-36-006) which supersedes a prior bulletin (Requirement).","A fixed compliance deadline (prior to 1 January 1993) creates scheduling pressure (Compliance).","References to related foreign airworthiness directives (Swedish AD 1-054 superseding 1-053) requiring cross-referencing (Note).","Limited textual detail in the AD itself about the precise technical steps and no alternative compliance routes described in the instrument (Requirement)."],"plain_english_summary":"This airworthiness directive requires operators of Saab SF340 aeroplanes (serials SF340A‑004 to SF340A‑159 and SF340B‑160 to SF340B‑339) to carry out the sensor‑loop modification or relocation specified in Saab Service Bulletin 340‑36‑006, replacing the earlier bulletin, by 1 January 1993.  \n\nThe mandated change—enforced by the Civil Aviation Safety Authority—aims to ensure bleed‑air leaks are detected and to prevent fuselage‑skin damage or reduced structural integrity; operators bear the cost and must follow the prescribed Saab procedure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-36-sensor-loops","history":"/api/acts/ad-sf340-36-sensor-loops/history","analysis":"/api/acts/ad-sf340-36-sensor-loops/analysis","conflicts":"/api/acts/ad-sf340-36-sensor-loops/conflicts","importantCases":"/api/acts/ad-sf340-36-sensor-loops/important-cases","documents":"/api/acts/ad-sf340-36-sensor-loops/documents"}}