{"id":"F2006B10228","name":"AD/GAZELLE/1 - Main Gearbox - Inspection During Initial Operations","slug":"ad-gazelle-1-main-gearbox-inspection-during-initial-operations","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55886,"registerId":"commonwealth-F2006B10228-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAZELLE/1 - Main Gearbox - Inspection During Initial Operations","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/1 Main Gearbox - Inspection During Initial Operations\n\n\n8/76\n\n \n\nApplicability: All models SA341 fitted with main gear box P/N 341A.32. 1000.01, .02, .03 or .05 (not modified to AMS 07.7077) with less than 25 hours time in service since new or recondition.\n\n \n\nDocument: Aerospatiale Gazelle SB 341 05.10. Compliance: In accordance with the requirement document.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original scope of the directive. Airworthiness Directives are typically narrow, targeted safety instruments. The applicability criteria (specific part numbers, hour thresholds, and modification exclusions) represent the precise original intent — to catch early-life gearbox defects in specific Gazelle variants. No evidence of scope creep."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 4 defined part numbers in applicability section","Single compliance requirement referencing external document","No nested exceptions or conditional logic beyond basic applicability criteria","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Straightforward binary applicability test (part number + hours in service + modification status)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific inspections of the main gearbox on certain Eurocopter Gazelle helicopters.\n\n**Who it affects:**\n- Owners and operators of **SA341 model Gazelle helicopters**\n- Specifically those with main gearbox part numbers ending in .01, .02, .03, or .05\n- Only applies if the gearbox has **less than 25 hours of flight time** since being new or reconditioned\n- Does NOT apply if the gearbox has been modified to specification AMS 07.7077\n\n**What it requires:**\n- Operators must follow the inspection procedures outlined in **Aerospatiale Service Bulletin 341 05.10**\n- This is a \"during initial operations\" directive, meaning it applies early in the component's service life\n\n**Why it matters:**\nMain gearbox failures in helicopters are catastrophic. This AD catches potential manufacturing or reconditioning defects before they cause accidents. The 25-hour threshold suggests this targets infant mortality failures — defects that show up early in a component's life."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope, as stated in the text provided, is limited to SA341 helicopters fitted with the listed main gearbox part numbers with less than 25 hours time in service and not modified to AMS 07.7077. The directive's mechanical effect—mandatory inspection during initial operations via the referenced service bulletin—aligns with that stated applicability. There is no indication in the provided text that the scope expands beyond those stated limits."},"complexity_factors":["Narrow, specific applicability (limited to SA341 with listed gearbox part numbers and <25 hours TIS). (Applicability)","Dependence on an external service document (Aerospatiale Gazelle SB 341 05.10) for all technical procedures and compliance detail. (Document; Compliance)","Technical nature of the inspection requires specialist maintenance skills and possibly parts/rectification work if defects are found.","A single exclusion (modification to AMS 07.7077) creates a binary condition operators must verify.","Short time-in-service threshold (25 hours) concentrates action in initial operational period and may require rapid scheduling by operators."],"plain_english_summary":"This AD mandates initial‑operations inspections of the main gearbox on certain Eurocopter SA341 Gazelle helicopters (specified gearbox P/Ns) if the gearbox has <25 hours TIS and is not modified to AMS 07.7077, by requiring compliance with Aerospatiale SB 341 05.10. It aims to detect early gearbox problems; costs and downtime fall to owners/operators, and the AD delegates technical detail to the referenced service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gazelle-1-main-gearbox-inspection-during-initial-operations","history":"/api/acts/ad-gazelle-1-main-gearbox-inspection-during-initial-operations/history","analysis":"/api/acts/ad-gazelle-1-main-gearbox-inspection-during-initial-operations/analysis","conflicts":"/api/acts/ad-gazelle-1-main-gearbox-inspection-during-initial-operations/conflicts","importantCases":"/api/acts/ad-gazelle-1-main-gearbox-inspection-during-initial-operations/important-cases","documents":"/api/acts/ad-gazelle-1-main-gearbox-inspection-during-initial-operations/documents"}}