{"id":"F2006B10012","name":"AD/G1159/11 - Flight Control Trim Systems - Inspection and Modification","slug":"ad-g1159-11-flight-control-trim-systems-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55377,"registerId":"commonwealth-F2006B10012-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G1159/11 - Flight Control Trim Systems - Inspection and Modification","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/G1159/11 Flight Control Trim Systems - Inspection\n\nand Modification\n\nApplicability: All models with S/Nos. 1 to 135 and 775. Document:  Grumman Aircraft Service Change No. 168.\n\nCompliance: Within 150 hours time in service after 29 March 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\n \n\n\n3/74\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1373},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This 1974 directive maintains its original narrow scope. It addresses a specific technical modification to flight control trim systems on identified Gulfstream aircraft and has not expanded to cover additional systems, aircraft types, or operational requirements."},"complexity_factors":["Extremely short text (under 150 words)","Single, unambiguous compliance requirement (one deadline, one action)","Narrow applicability limited to specific aircraft models and serial numbers","Only one external technical reference (Grumman Service Change No. 168)","No defined terms, exceptions, or conditional logic"],"plain_english_summary":"**What it is:** This is a mandatory safety notice (called an **Airworthiness Directive**) issued by the Civil Aviation Safety Authority. It has the force of law for aircraft owners and operators.\n\n**What it requires:** Owners or operators of specific Gulfstream (Grumman) aeroplanes (models G1159 and G-IV with serial numbers 1–135 and 775) must have their aircraft's **flight control trim systems** (the mechanisms that adjust the aeroplane's control surfaces to maintain stable flight without constant pilot input) inspected and modified.\n\n**How to comply:** The inspection and modification must be carried out exactly as specified in a technical document called **Grumman Aircraft Service Change No. 168**. The work must be completed within **150 hours of flying time** after 29 March 1974.\n\n**Why it matters:** This directive mandates a specific safety fix to prevent potential failures in the trim system that could affect the pilot's ability to control the aircraft safely."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g1159-11-flight-control-trim-systems-inspection-and-modification","history":"/api/acts/ad-g1159-11-flight-control-trim-systems-inspection-and-modification/history","analysis":"/api/acts/ad-g1159-11-flight-control-trim-systems-inspection-and-modification/analysis","conflicts":"/api/acts/ad-g1159-11-flight-control-trim-systems-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-g1159-11-flight-control-trim-systems-inspection-and-modification/important-cases","documents":"/api/acts/ad-g1159-11-flight-control-trim-systems-inspection-and-modification/documents"}}