{"id":"F2006B10080","name":"AD/G159/37 - Main Landing Gear Uplock Beam Assembly - Inspection","slug":"ad-g159-37-main-landing-gear-uplock-beam-assembly-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55536,"registerId":"commonwealth-F2006B10080-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/37 - Main Landing Gear Uplock Beam Assembly - 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 ORDERS CIVIL AVIATION SAFETY AUTHORITY                            PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES\n\n \n\nAD/G159/37 Main Landing Gear Uplock Beam Assembly -\n\nInspection\n\n\n3/80\n\n \n\nApplicability: All Model G159.\n\n \n\nDocument: Gulfstream American Customer Bulletin No. 12. Compliance:  At each daily or overnight inspection.\n\nNote: This inspection may be performed and certified for by the pilot in command.\n\n \n\nBackground: Failures of the M.L.G. uplock beam assembly have occurred in overseas registered areoplanes.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive sets a standalone inspection requirement for all Model G159 aeroplanes and cites a customer bulletin for procedure. The text contains no indication that the directive expands or narrows an earlier scope; it prescribes inspections at each daily or overnight check for the whole model type and does not state any amendment to prior applicability or requirements."},"complexity_factors":["Narrow and specific applicability (\"All Model G159\") reduces scope complexity.","Clear and frequent compliance requirement (\"At each daily or overnight inspection\") simplifies scheduling but increases operational frequency.","Procedural detail is externalised to Gulfstream American Customer Bulletin No. 12, creating a dependency on another document for technical steps.","Permits pilot-in-command to perform and certify the inspection, introducing variation in who performs the task and therefore potential variability in implementation.","The AD text supplied does not contain enforcement or penalty details, which leaves practical compliance processes to operators/regulators and adds procedural uncertainty."],"plain_english_summary":"This directive requires operators of all Gulfstream (Grumman) Model G159 aeroplanes to inspect the main landing gear uplock beam assembly at each daily or overnight check, using the procedure in Gulfstream American Customer Bulletin No. 12. It was issued after reported uplock beam failures on overseas aircraft.\n\nThe inspection may be performed and certified by the pilot in command, shifting some labor from maintenance to flight crews and imposing an ongoing compliance burden on all G159 operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical failure mode in a specific aircraft type. It has not expanded beyond its original purpose of ensuring the airworthiness of G.159 main landing gear uplock assemblies."},"complexity_factors":["Very short document (approximately 150 words)","Only one defined term (M.L.G. — Main Landing Gear, abbreviated in the text)","No cross-references to other legislation or regulations","Simple unconditional obligation: inspect at each daily/overnight check","Single exception/clarification: pilot may perform the inspection (stated as a note)","No nested conditions or exceptions to exceptions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of **Gulfstream G.159 series aeroplanes** to inspect the **main landing gear uplock beam assembly** (a structural component that helps lock the landing gear in place when retracted) during every daily or overnight inspection.\n\n**Who it affects:**\n- Owners and operators of all Gulfstream G.159 model aircraft\n- Pilots (who are permitted to perform and certify this specific inspection themselves)\n\n**Why it matters:**\nThe directive was issued because the uplock beam assembly has been failing on G.159 aircraft registered overseas. These failures could affect the landing gear's ability to stay retracted or deploy properly, posing a safety risk. The frequent inspection requirement (daily or overnight) ensures problems are caught early before they cause an incident.\n\n**Key practical point:** Unlike many maintenance tasks that require a licensed aircraft maintenance engineer, this particular inspection can be done and signed off by the pilot in command."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-37-main-landing-gear-uplock-beam-assembly-inspection","history":"/api/acts/ad-g159-37-main-landing-gear-uplock-beam-assembly-inspection/history","analysis":"/api/acts/ad-g159-37-main-landing-gear-uplock-beam-assembly-inspection/analysis","conflicts":"/api/acts/ad-g159-37-main-landing-gear-uplock-beam-assembly-inspection/conflicts","importantCases":"/api/acts/ad-g159-37-main-landing-gear-uplock-beam-assembly-inspection/important-cases","documents":"/api/acts/ad-g159-37-main-landing-gear-uplock-beam-assembly-inspection/documents"}}