{"id":"F2006B10255","name":"AD/GAZELLE/9 - Main Gearbox Input Gear Flange - Inspection of Attachment Nut","slug":"ad-gazelle-9-main-gearbox-input-gear-flange-inspection-of-attachment-nut","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55926,"registerId":"commonwealth-F2006B10255-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAZELLE/9 - Main Gearbox Input Gear Flange - Inspection of Attachment Nut","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)  Eurocopter SA341 and SA342 (Gazelle) Series Helicopters\n\n \n\nAD/GAZELLE/9  Main Gearbox Input Gear Flange - Inspection of Attachment Nut\n\n\n5/80\n\n \n\nApplicability: Models SA-341 and SA-342 fitted with main gearbox P/N 341A.32.1000.01 to .05, not modified in accordance with AMS 07.7076/S374.\n\n \n\nDocument: Gazelle SB 65.19.\n\n \n\nCompliance: Within 100 hours time in service after 30 June 1980.\n\n \n\nBackground: The manufacturer has introduced an inspection to ensure that the correct torque load has been applied to the notched nut which retains the input gear flange.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect identified by the manufacturer. It has not expanded beyond its original purpose of ensuring proper torque on a single critical fastener."},"complexity_factors":["Single, specific mechanical component addressed (main gearbox input gear flange attachment nut)","Clear applicability criteria using part numbers and modification status","Single compliance deadline with straightforward time-in-service calculation","No defined terms section, no cross-references to other legislation, no conditional exceptions","Background explanation is one sentence","Total length is approximately 150 words"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific helicopters.\n\n**What it does:**\nOrders owners and operators of certain Eurocopter Gazelle helicopters (models SA-341 and SA-342) to inspect a specific nut on the main gearbox. The nut holds the input gear flange in place, and the check ensures it has been tightened to the correct torque (twisting force).\n\n**Who it affects:**\n- Owners and operators of Gazelle helicopters with main gearbox part numbers 341A.32.1000.01 through .05\n- Only applies if the helicopter has **not** already been modified according to service bulletin AMS 07.7076/S374\n\n**When to comply:**\nWithin 100 hours of flying time after 30 June 1980.\n\n**Why it matters:**\nIf this nut isn't tightened properly, the input gear flange could fail, potentially causing catastrophic gearbox failure and loss of control of the helicopter. This directive forces a one-time inspection to catch any assembly errors before they cause accidents.\n\n**Key details:**\n- **Document reference:** Gazelle Service Bulletin 65.19 (the manufacturer's official instructions for the inspection)\n- **Compliance method:** Follow the manufacturer's service bulletin\n- **Effective date baseline:** 30 June 1980"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD text does not indicate any change from an earlier or different scope. It introduces a single inspection requirement for specific gearbox part numbers on SA-341 and SA-342 helicopters, specifies the compliance window, references the service bulletin for procedure, and excludes gearboxes modified per AMS 07.7076/S374. No information in the text shows the scope was altered from an original intent."},"complexity_factors":["Narrow applicability to two helicopter models and five specific gearbox part numbers (Applicability)","Single, defined action required (inspection of an attachment nut) rather than multiple or conditional measures (Document, Background)","Fixed compliance timing (within 100 hours TIS after 30 June 1980) — straightforward deadline (Compliance)","Technical procedure delegated to an external service bulletin (Gazelle SB 65.19), requiring operators to obtain and follow another document (Document)","Simple exclusion clause for gearboxes modified per AMS 07.7076/S374 — adds a small conditional determination for operators (Applicability)","No graded enforcement scheme or multiple compliance pathways set out in the AD text — reduces procedural complexity (AD text)"],"plain_english_summary":"This instrument mandates a one‑time inspection of the notched attachment nut that secures the main‑gearbox input‑gear flange on certain Gazelle SA‑341/SA‑342 helicopters, following Gazelle Service Bulletin 65.19, unless the gearbox has been modified to AMS 07.7076/S374.  \n\nIt affects owners/operators and their maintenance providers, creating a short compliance window and direct inspection and repair costs to verify correct nut torque and ensure continued airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gazelle-9-main-gearbox-input-gear-flange-inspection-of-attachment-nut","history":"/api/acts/ad-gazelle-9-main-gearbox-input-gear-flange-inspection-of-attachment-nut/history","analysis":"/api/acts/ad-gazelle-9-main-gearbox-input-gear-flange-inspection-of-attachment-nut/analysis","conflicts":"/api/acts/ad-gazelle-9-main-gearbox-input-gear-flange-inspection-of-attachment-nut/conflicts","importantCases":"/api/acts/ad-gazelle-9-main-gearbox-input-gear-flange-inspection-of-attachment-nut/important-cases","documents":"/api/acts/ad-gazelle-9-main-gearbox-input-gear-flange-inspection-of-attachment-nut/documents"}}