{"id":"F2006B10869","name":"AD/JBK 117/21 Amdt 1 - Rescue Winch Operation","slug":"ad-jbk-117-21-amdt-1-rescue-winch-operation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56371,"registerId":"commonwealth-F2006B10869-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"UNCONTROLLABLE WINCH PROCEDURES","sectionType":"part","heading":"UNCONTROLLABLE WINCH PROCEDURES","content":"# UNCONTROLLABLE WINCH PROCEDURES\n\nBK117 Helicopters Serial Numbers 1001 through 1024 except 1009\n\nWhen up or down operation of the winch becomes uncontrollable, interrupt the supply of power to the motor and stop the winch operation in accordance with the following procedure:\n\nThe cable operation cannot be controlled.\n\n1. RESCUE WINCH Switch ————————————— OFF 2. BUS TIE Switch ————————————————— OFF 3. PWR SEL Switch ———————————————— OFF\n\n    4. GENERATOR I Switch —————————————— OFF\n\n    5. Cut any unnecessary load if the load of the generator exceed 150 Amps.\n\n    6. Land as soon as possible.\n\n    7. Disconnect the Rescue Winch electrical connector, then re-supply power.\n\nNote:\n\nThe power supply to the winch motor cannot be interrupted by the WINCH CONT circuit breaker or","sortOrder":0},{"sectionNumber":"RESCUE WINCH MAIN SWITCH OFF.","sectionType":"part","heading":"RESCUE WINCH MAIN SWITCH OFF.","content":"Annex A\n\n# UNCONTROLLABLE WINCH PROCEDURES\n\nBK117 Helicopters Serial Numbers 1001 through 1024 except 1009\n\nWhen up or down operation of the winch becomes uncontrollable, interrupt the supply of power to the motor and stop the winch operation in accordance with the following procedure:\n\nThe cable operation cannot be controlled.\n\n1. RESCUE WINCH Switch ————————————— OFF 2. BUS TIE Switch ————————————————— OFF 3. PWR SEL Switch ———————————————— OFF\n\n    4. GENERATOR I Switch —————————————— OFF\n\n    5. Cut any unnecessary load if the load of the generator exceed 150 Amps.\n\n    6. Land as soon as possible.\n\n    7. Disconnect the Rescue Winch electrical connector, then re-supply power.\n\nNote:\n\nThe power supply to the winch motor cannot be interrupted by the WINCH CONT circuit breaker or\n\n# RESCUE WINCH MAIN SWITCH OFF.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment does not broaden the instrument beyond its original safety purpose. It revises and clarifies the emergency procedure for stopping an uncontrollable rescue winch, introduces serial‑number specific variations and a generator‑current exception for a specific model (BK117 C‑1), and emphasises which switches/circuit breakers do not remove motor power. These changes are technical refinements within the original safety scope rather than a material expansion of remit or purpose."},"complexity_factors":["Two serial‑number groups with slightly different procedural steps (1001–1024 except 1009; 1009, 1025 and subsequent)","Minor conditional variation: generator load limit 150 A generally, 200 A for BK117 C‑1","Small number of discrete, linear steps (7 steps for first group, 6 for second group)","Ambiguous/formatted text and repetitions in source (duplicated blocks and truncated notes) that raise interpretive friction","No external cross‑references or defined‑term list; procedure is self‑contained","Critical safety note that certain switches/circuit breakers do not interrupt motor power (non‑intuitive operational detail)"],"plain_english_summary":"**What this instrument does (mechanical change)\n\n- It sets a step‑by‑step emergency procedure to stop an uncontrollable rescue winch on certain MBB/Eurocopter/Sikorsky BK117 helicopters by removing electrical power to the winch motor and isolating the winch electrical connector.\n- The procedure is split into two aircraft groups by serial number, with slightly different switch steps and a different generator load limit for one model variant (BK117 C‑1).\n\nWho this affects\n\n- Pilots and flight crews who operate BK117 helicopters with rescue winches (serial numbers 1001–1024 except 1009; and serial numbers 1009, 1025 and later).\n- Maintenance personnel who may have to disconnect and restore the rescue winch electrical connector after the procedure and who must ensure wiring and circuit access are serviceable.\n- Operators who must amend their checklists, procedures, training and possibly placards or pilot manuals to reflect these emergency steps.\n\nThe steps required (plain language, mechanical order)\n\n- For serial nos. 1001–1024 (except 1009):\n  1. Move RESCUE WINCH switch to OFF.\n  2. Move BUS TIE switch to OFF.\n  3. Move PWR SEL switch to OFF.\n  4. Move GENERATOR 1 switch to OFF.\n  5. Shed unnecessary electrical loads if generator current exceeds 150 A.\n  6. Land as soon as possible.\n  7. Disconnect the rescue winch electrical connector; then re‑apply power.\n\n- For serial no. 1009 and serial nos. 1025 onwards:\n  1. Move RESCUE WINCH switch to OFF.\n  2. Move No.1 BUS TIE switch to OFF.\n  3. Move GENERATOR 1 switch to OFF.\n  4. Shed unnecessary electrical loads if generator current exceeds 150 A (200 A for BK117 C‑1).\n  5. Land as soon as possible.\n  6. Disconnect the rescue winch electrical connector; then re‑apply power.\n\nImportant operational note\n\n- The procedure explicitly warns that the WINCH CONT circuit breaker and the RESCUE WINCH MAIN SWITCH do not interrupt power to the winch motor; therefore the listed sequence of switches and connector disconnection is necessary to remove power.\n\nStated purpose and practical assessment\n\n- The stated purpose is to stop an uncontrollable up/down winch movement by removing the motor power source and isolating the winch electrical connector (the safety objective is to prevent injury, cable run‑away, or structural damage).\n\n- Costs and incentives: Operators bear the compliance costs — updating checklists, training aircrew, and possible mission aborts. There is also a maintenance cost when the electrical connector is physically disconnected/restored after a flight. The requirement to land \"as soon as possible\" forces mission interruption and may change operational choices in live rescue scenarios.\n\n- Trade‑offs and implementation risks: The procedure requires pilots to perform multiple electrical isolations in flight and then to disconnect a connector (likely on the airframe) after landing; that imposes time pressure and risks if checklist items are missed. If the connector is hard to reach or requires maintenance access, there is an implementation cost and potential ground time.\n\n- Compliance burden and discretion: Compliance is procedural (follow checklist) rather than discretionary. Operators must revise manuals and train crews; regulators and maintenance organisations will decide how the connector disconnection is handled in maintenance practice.\n\n- Effects on private choice and operations: The measure narrows in‑flight options (fewer ways to stop the winch) and makes mission continuation less likely after an uncontrollable winch event. It concentrates safety benefit on persons at risk from the uncontrolled cable and on the aircraft, while imposing discrete compliance costs on operators and maintenance organisations.\n\nOverall: the instrument provides a clear, serial‑number‑specific electrical isolation sequence to stop an uncontrollable winch, with explicit warnings about which switches/circuit breakers will not cut motor power. Operators must implement the steps in flight and adjust maintenance and training practices accordingly."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be a focused technical amendment (Amendment 1) to an existing Airworthiness Directive or operational manual. The scope remains tightly limited to emergency winch procedures for specific BK117 helicopter serial numbers. No evidence of scope creep beyond original aviation safety purpose."},"complexity_factors":["Very short document (approximately 300 words)","No defined terms section or legal definitions","Simple conditional structure: two parallel procedures based on serial number ranges","No cross-references to other legislation or regulations","Procedural steps are numbered lists with minimal conditional logic (one amp threshold variation for C-1 model)","Repetitive content — same procedure appears multiple times with minor formatting variations","Technical aviation terminology used but explained through context (switches, bus ties, generators)"],"plain_english_summary":"This emergency procedure tells BK117 pilots and crew what to do if a rescue winch runs away and cannot be stopped. It prescribes one of two power-isolation sequences depending on helicopter serial number (early vs later models) and notes different amp limits for the C-1 variant. It matters because normal shut-offs and circuit breakers do not stop this fault — you must isolate power at the generator/bus level to prevent injury and aircraft damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jbk-117-21-amdt-1-rescue-winch-operation","history":"/api/acts/ad-jbk-117-21-amdt-1-rescue-winch-operation/history","analysis":"/api/acts/ad-jbk-117-21-amdt-1-rescue-winch-operation/analysis","conflicts":"/api/acts/ad-jbk-117-21-amdt-1-rescue-winch-operation/conflicts","importantCases":"/api/acts/ad-jbk-117-21-amdt-1-rescue-winch-operation/important-cases","documents":"/api/acts/ad-jbk-117-21-amdt-1-rescue-winch-operation/documents"}}