{"id":"F2006B06749","name":"AD/S-76/73 - Dual Inverter Wiring","slug":"ad-s-76-73-dual-inverter-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114576,"registerId":"commonwealth-F2006B06749-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\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 CASR 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.\n\n![](image.001.png)  \n\nSikorsky S-76 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/S-76/73 Dual Inverter Wiring 6/2004 D","sectionType":"part","heading":"AD/S-76/73 Dual Inverter Wiring 6/2004 DM","content":"# AD/S-76/73 Dual Inverter Wiring 6/2004 DM\n\nApplicability: Model S-76 A, B and C helicopters with dual channel autopilot and dual inverters installed.\n\nNote 1: Helicopters with the following serial numbers were manufactured with the dual channel autopilot and dual inverters installed:\n\nS-76 A\n\n| 760267                | 760300 through 760302 | 760366                |\n| --------------------- | --------------------- | --------------------- |\n| 760268                | 760304 through 760309 | 760369 through 760371 |\n| 760270 through 760298 | 760364                | 760373 through 760378 |\n| S-76 B                |                       |                       |\n| 760262                | 760393                | 762976 (760433)       |\n| 760269                | 760395                | 760437                |\n| 760299                | 760399                | 760439                |\n| 760303                | 760403                | 760441 through 760445 |\n| 760310 through 760363 | 760404                | 760447 through 760452 |\n| 760365                | 760409                | 760454                |\n| 760367                | 760410                | 760455                |\n| 760368                | 760413                | 760458                |\n| 760372                | 760414                | 760462                |\n| 760379 through 760382 | 760416                | 760465                |\n| 760387                | 760425                | 760507                |\n| 760391                | 760427 through 760430 |                       |\n| S-76 C                |                       |                       |\n| 760383 through 760386 | 760415                | 760453                |\n| 760388 through 760390 | 760417 through 760424 | 760456                |\n| 760392                | 760426                | 760457                |\n| 760394                | 760431                | 760459 through 760461 |\n| 760396 through 760398 | 760432                | 760463                |\n| 760400 through 760402 | 760434 through 760436 | 760464                |\n| 760405 through 760408 | 760438                | 760466 through 760506 |\n| 760411                | 760440                | 760508 through 760526 |\n| 760412                | 760446                |                       |","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":5,"scope_assessment":{"changed":false,"description":"The supplied document sets a targeted applicability (S‑76 A, B, C with dual autopilot and dual inverters and listed serial numbers) and prescribes corrective action under CASR subreg 39.1(1). The text contains no indication that the scope has been altered from an earlier instrument or intent; no prior version or amendment history is provided in the supplied material."},"complexity_factors":["Regulatory source and discretion: issued under subregulation 39.1(1) of CASR 1998, giving a CASA delegate authority to require corrective action (preamble).","Technical specificity: targets dual‑channel autopilot with dual inverters — a narrow, equipment‑specific safety issue (Applicability).","Extensive serial‑number listing: Note 1 lists many individual helicopter serial numbers, increasing administrative effort to determine applicability.","Missing remedial detail in supplied text: the AD refers to a 'requirement section' and 'compliance section' that set the instructions and timing but those actual instructions are not included here (preamble), raising interpretive and implementation complexity.","Operator cost and compliance burden: the AD requires actions 'be taken in relation to the aircraft' and 'in accordance with the instructions', which implies owners/operators must arrange and pay for the corrective work (preamble/applicability).","Dependence on external technical instructions: the AD mandates following specified instructions, implying cross‑reference to service documents or procedures that are not contained in the supplied excerpt.","Enforcement and record implications: by creating an enforceable maintenance requirement, the AD has compliance-monitoring and recordkeeping consequences for operators (preamble)."],"plain_english_summary":"This Airworthiness Directive, issued by a CASA delegate under subregulation 39.1(1) of CASR 1998, requires corrective wiring work for dual‑inverter installations on Sikorsky S‑76 A, B and C helicopters fitted with a dual‑channel autopilot and dual inverters (specific serial numbers listed). It binds owners/operators of those helicopters to carry out the prescribed action within the stated compliance times to address an unsafe condition, creating an enforceable maintenance obligation and associated operational and cost impacts."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This appears to be a standard, narrow Airworthiness Directive focused on a specific technical defect in specific aircraft. There is no indication of scope creep; it maintains the typical AD structure of identifying affected aircraft and prescribing mandatory corrective action for a defined unsafe condition."},"complexity_factors":["Short, single-purpose document focused on one specific technical issue (dual inverter wiring)","Clear applicability section with explicit serial number lists (though formatted as tables)","No nested legislative references or cross-references to other statutes","Limited defined terms (only standard aviation terminology like 'dual channel autopilot' and 'dual inverters')","Straightforward conditional logic: if your helicopter is in this list AND has these features, the AD applies","Document appears truncated — missing the actual requirements and compliance sections which would add procedural complexity"],"plain_english_summary":"This CASA Airworthiness Directive mandates corrective action on the dual inverter wiring of certain Sikorsky S-76A/B/C helicopters equipped with dual‑channel autopilot and dual inverters (specified by serial number). It affects owners/operators of those listed aircraft because compliance is legally required to return the helicopter to service. The provided document appears to omit the specific corrective and compliance details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-73-dual-inverter-wiring","history":"/api/acts/ad-s-76-73-dual-inverter-wiring/history","analysis":"/api/acts/ad-s-76-73-dual-inverter-wiring/analysis","conflicts":"/api/acts/ad-s-76-73-dual-inverter-wiring/conflicts","importantCases":"/api/acts/ad-s-76-73-dual-inverter-wiring/important-cases","documents":"/api/acts/ad-s-76-73-dual-inverter-wiring/documents"}}