{"id":"F2006B10014","name":"AD/G1159/13 - Elevator Mass Balance - Inspection","slug":"ad-g1159-13-elevator-mass-balance-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55383,"registerId":"commonwealth-F2006B10014-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G1159/13 - Elevator Mass Balance - 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)  Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes\n\n \n\nAD/G1159/13 Elevator Mass Balance - Inspection 5/74\n\nApplicability: All models with S/Nos. 1 to 102 and 775 with aircraft Service Change No. 131 incorporated.\n\n \n\nDocument:  Grumman Customer Bulletin No. 183. Compliance: Before 1 July 1974.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1868},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope addressing a specific technical airworthiness issue (elevator mass balance integrity) on a limited fleet of Gulfstream aircraft. There is no evidence of scope expansion beyond the initial safety concern."},"complexity_factors":["Single, unambiguous compliance action (one inspection only)","Limited applicability defined by specific serial numbers (1–102 and 775)","No conditional logic, exceptions, or nested provisions","Only one external reference document (Grumman Customer Bulletin No. 183)","Straightforward deadline with no phased or tiered requirements"],"plain_english_summary":"This Airworthiness Directive requires a safety inspection of the **elevator mass balance** on specific Gulfstream business jets.\n\n**Who is affected:**\n- Owners and operators of Gulfstream (Grumman) G1159 and G-IV series aircraft\n- Specifically those with serial numbers 1–102 and serial number 775\n- Only if the aircraft has **Service Change No. 131** incorporated (a specific modification)\n\n**What must be done:**\nThe aircraft's elevator mass balance must be inspected following the procedures in **Grumman Customer Bulletin No. 183**.\n\nIn plain terms, the *elevator* is the moveable surface on the tail that makes the aircraft pitch up or down. The *mass balance* refers to weights installed inside this surface to prevent dangerous high-speed vibrations (called *flutter*) that could tear the tail off or cause loss of control. This directive mandates checking that these weights are properly installed and secure.\n\n**Compliance deadline:**\nThe inspection must be completed before 1 July 1974."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g1159-13-elevator-mass-balance-inspection","history":"/api/acts/ad-g1159-13-elevator-mass-balance-inspection/history","analysis":"/api/acts/ad-g1159-13-elevator-mass-balance-inspection/analysis","conflicts":"/api/acts/ad-g1159-13-elevator-mass-balance-inspection/conflicts","importantCases":"/api/acts/ad-g1159-13-elevator-mass-balance-inspection/important-cases","documents":"/api/acts/ad-g1159-13-elevator-mass-balance-inspection/documents"}}