{"id":"F2006B10239","name":"AD/GAZELLE/2 - Main Gearbox Oil/Pump/Hydraulic Unit - Inspection","slug":"ad-gazelle-2-main-gearbox-oil-pump-hydraulic-unit-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55897,"registerId":"commonwealth-F2006B10239-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAZELLE/2 - Main Gearbox Oil/Pump/Hydraulic Unit - Inspection","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/2 Main Gearbox Oil/Pump/Hydraulic\n\nUnit - Inspection\n\n\n9/76\n\n \n\nApplicability: All models SA341. Document:  Gazelle SB 05.09a.\n\nCompliance: 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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue Airworthiness Directive from 1976 (as indicated by '9/76') addressing a specific technical inspection requirement. It has not expanded beyond its original purpose of ensuring the main gearbox oil pump and hydraulic unit on Gazelle helicopters are inspected for safety. ADs are typically narrow, technical instruments and this one remains confined to its original scope."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — relies entirely on external reference to Gazelle SB 05.09a","No conditional logic or nested exceptions","Simple structure: applicability statement, document reference, and compliance instruction only","Single cross-reference to one external technical document (Service Bulletin 05.09a)","No legislative amendments, transitional provisions, or interpretive provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for **Eurocopter SA341 and SA342 Gazelle helicopters**.\n\n**What it does:**\n- Requires owners and operators of these specific helicopter models to inspect the **main gearbox oil pump and hydraulic unit**.\n- The inspection must follow the procedures outlined in **Gazelle Service Bulletin 05.09a** (the \"requirement document\").\n\n**Who it affects:**\n- Anyone who owns or operates **any model of the SA341 Gazelle helicopter** in Australia.\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. They are issued when a safety issue is discovered that could affect aircraft operation.\n- Compliance is **mandatory** — you cannot legally fly the aircraft until the required inspection is completed as specified.\n- This particular directive (numbered AD/GAZELLE/2, originally issued 9/76) addresses potential problems with the main gearbox oil system, which is critical for helicopter safety. If the oil pump or hydraulic unit fails, it could lead to catastrophic gearbox failure and loss of control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text provided does not indicate any change in scope from a prior instrument. The AD, as written, applies to all SA341 models and requires compliance with Gazelle SB 05.09a. No expansion or narrowing of applicability is stated in the document text supplied."},"complexity_factors":["Narrow technical scope: single component group (main gearbox oil/pump/hydraulic unit) and specific helicopter model (All SA341) (Applicability).","Procedural detail outsourced to an external document (Gazelle SB 05.09a) rather than included in the AD (Document/Compliance statements).","Regulatory formality: issued as an airworthiness directive under Civil Aviation Regulations, which creates a binding compliance obligation despite the AD’s brevity (header: Civil Aviation Regulations 1998, PART 39; Civil Aviation Safety Authority).","Absence of timing, intervals, or corrective-action text in the AD itself — operators must consult the service bulletin to know exact requirements (Compliance: In accordance with the requirement document).","Operational burden concentrated on aircraft operators and maintenance providers who must obtain and implement the referenced service bulletin (Applicability/Compliance).","Implementation risk tied to the completeness and clarity of the external service bulletin (AD cross-reference structure)."],"plain_english_summary":"This AD requires all Eurocopter/Gazelle SA341 helicopters to have the main gearbox oil/pump/hydraulic unit inspected in accordance with Gazelle Service Bulletin SB 05.09a. CASA issued it as a regulatory airworthiness directive, so affected operators must obtain the service bulletin and carry out the inspection and any corrective actions.\n\nThe AD itself cross‑references SB 05.09a for procedures, timing and corrective work; operators bear compliance cost and responsibility."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gazelle-2-main-gearbox-oil-pump-hydraulic-unit-inspection","history":"/api/acts/ad-gazelle-2-main-gearbox-oil-pump-hydraulic-unit-inspection/history","analysis":"/api/acts/ad-gazelle-2-main-gearbox-oil-pump-hydraulic-unit-inspection/analysis","conflicts":"/api/acts/ad-gazelle-2-main-gearbox-oil-pump-hydraulic-unit-inspection/conflicts","importantCases":"/api/acts/ad-gazelle-2-main-gearbox-oil-pump-hydraulic-unit-inspection/important-cases","documents":"/api/acts/ad-gazelle-2-main-gearbox-oil-pump-hydraulic-unit-inspection/documents"}}