{"id":"F2007L01595","name":"AD/GBK 117/17 - Fire Protection System Clamps","slug":"ad-gbk-117-17-fire-protection-system-clamps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":66160,"registerId":"commonwealth-F2007L01595-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter BK 117 Series Helicopters","sectionType":"division","heading":"Eurocopter BK 117 Series Helicopters","content":"### Eurocopter BK 117 Series Helicopters\n\n| AD/GBK 117/17 | Fire Protection System Clamps | 7/2007 |\n| ------------- | ----------------------------- | ------ |\n\n| Applicability: | Model MBB-BK 117C-2 helicopters, serial number (S/N) 9004 through 9104, and 9106, 9107 and 9111, fitted with fire extinguishing system B262K1002-801, B262K1003-801 or B262K1004-801.                                                                                                         |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Replace clamps Part Number NAS1922-0100-3 or TORRO 16-27/9C7W5 with clamps P/N GBSM24/18W4SK in accordance with Eurocopter Deutschland Alert Service Bulletin No. MBB BK117 C-2-26A-001 dated 22 January 2007 or later NAA approved revision.Note: EASA AD 2007-0121 dated 3 May 2007 refers. |\n| Compliance:    | At the next 100 Flight hour inspection, but not later than 31 December 2007, whichever occurs first.                                                                                                                                                                                          |\n|                | This Airworthiness Directive becomes effective on 5 July 2007.                                                                                                                                                                                                                                |\n| Background:    | An investigation following an inadvertent operation of the fire extinguishing system discovered that one of two injection tubes became disconnected. This condition, if not corrected, could affect the ability of the fire extinguishing system to perform its intended function.            |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n15 May 2007","sortOrder":0},{"sectionNumber":"AD/GBK 117/17","sectionType":"part","heading":"AD/GBK 117/17","content":"## AD/GBK 117/17","sortOrder":1},{"sectionNumber":"Fire Protection System Clamps","sectionType":"part","heading":"Fire Protection System Clamps","content":"## Fire Protection System Clamps","sortOrder":2},{"sectionNumber":"7/2007","sectionType":"part","heading":"7/2007","content":"## 7/2007","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety defect in a specific aircraft model. The scope remains tightly focused on the original safety issue — preventing fire extinguishing system failure due to clamp defects. No scope creep is evident."},"complexity_factors":["Single, specific technical requirement (clamp replacement)","Limited applicability — only 102 specific serial numbers plus 3 additional units","Clear compliance deadline with simple alternative trigger (100 flight hours OR fixed date)","Only 3 defined part numbers for affected systems","No nested exceptions or conditional logic","Single cross-reference to EASA AD for context only","Document is 1 page with straightforward tabular format"],"plain_english_summary":"CASA has issued a mandatory Airworthiness Directive ordering owners/operators of certain Eurocopter MBB‑BK117C‑2 helicopters (specified serials) fitted with listed fire‑extinguishing systems to replace identified hose clamps with new part numbers per Eurocopter service instructions.  \n\nThe action fixes clamp failures that can disable fire suppression; work is required by the next 100‑hour inspection or by 31 Dec 2007 and non‑compliance grounds the aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive addresses a specific defect discovered during an investigation (a disconnected injection tube) and confines remedial action to the affected BK117 C‑2 serial numbers fitted with specified system P/Ns. There is no indication in the text that the AD broadens scope beyond that original safety objective."},"complexity_factors":["Narrow applicability: limited to specific helicopter serial numbers and specific fire‑extinguishing system part numbers (affects identification and fleet tracking).","Prescriptive parts requirement: mandates removal of particular clamp P/Ns and fitment of a specified replacement P/N.","Reference to external document: compliance requires following Eurocopter Alert Service Bulletin No. MBB BK117 C-2-26A-001 (or later NAA‑approved revision), creating dependency on that SB and any approved revisions.","Time-bound compliance: action must occur at the next 100‑flight‑hour inspection or by a fixed calendar date, introducing inspection scheduling and paperwork constraints.","Operational burden: operators bear parts, labour and recordkeeping costs; maintenance organisations must verify parts and conformity to the SB.","Safety traceability: requires confirmation that the injection tube/clamp condition is corrected to restore fire‑extinguishing system reliability."],"plain_english_summary":"Requires operators of certain Eurocopter MBB‑BK 117C‑2 helicopters (specified serial numbers fitted with listed fire‑extinguishing system part numbers) to replace older fire‑protection clamps with a new clamp part per Eurocopter Alert Service Bulletin. Compliance is at the next 100‑flight‑hour inspection or by 31 December 2007, whichever is earlier. The rule shifts the cost and work to aircraft operators, who must follow the manufacturer’s service instructions or an NAA‑approved revision."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gbk-117-17-fire-protection-system-clamps","history":"/api/acts/ad-gbk-117-17-fire-protection-system-clamps/history","analysis":"/api/acts/ad-gbk-117-17-fire-protection-system-clamps/analysis","conflicts":"/api/acts/ad-gbk-117-17-fire-protection-system-clamps/conflicts","importantCases":"/api/acts/ad-gbk-117-17-fire-protection-system-clamps/important-cases","documents":"/api/acts/ad-gbk-117-17-fire-protection-system-clamps/documents"}}