{"id":"F2006B10070","name":"AD/G159/26 - Main Landing Gear Uplock Beam Bracket - Inspection","slug":"ad-g159-26-main-landing-gear-uplock-beam-bracket-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55515,"registerId":"commonwealth-F2006B10070-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/26 - Main Landing Gear Uplock Beam Bracket - 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/G159/26 Main Landing Gear Uplock Beam Bracket - Inspection 8/75\n\nApplicability: All Gulfstream 1 and TC4C aeroplanes. Document:  Grumman Customer Bulletin No. 272.\n\nCompliance: Within 100 hours time in service after 29 August 1975 and thereafter at intervals not exceeding 100 hours time in service.\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 1975 addressing a specific mechanical inspection requirement. It has not expanded beyond its original narrow scope of ensuring the safety of a particular landing gear component on specific aircraft models."},"complexity_factors":["Very short document (approximately 100 words)","Only 3 operative paragraphs (Applicability, Document reference, Compliance)","No defined terms section","No cross-references to other legislation","Simple conditional logic: single compliance deadline plus recurring interval","References only one external technical document (Grumman Customer Bulletin No. 272)"],"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 specific Gulfstream aircraft to inspect a particular part of the main landing gear.\n\n**What it does:**\n- **Targets:** All Gulfstream G.159 series aeroplanes (also known as the Grumman Gulfstream I) and the military TC4C variant.\n- **The problem:** The \"uplock beam bracket\" on the main landing gear needs checking. This bracket helps secure the landing gear in the retracted (up) position during flight. If it fails, the gear could collapse or not stay retracted.\n- **What must be done:** Operators must inspect this bracket following the procedures in Grumman Customer Bulletin No. 272.\n- **When:** First inspection within 100 hours of flying time after 29 August 1975, then repeated every 100 flight hours thereafter.\n\n**Why it matters:** This is a recurring safety check designed to catch fatigue, cracks, or wear in a critical structural component before it causes a landing gear failure. Airworthiness Directives are legally binding — operators cannot skip them without grounding the aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies to all Gulfstream 1 and TC4C aeroplanes and mandates inspections at fixed 100-hour intervals, referencing Grumman Customer Bulletin No. 272 for procedure. The text contains no indication that it expands or narrows the stated applicability or inspection requirements relative to the directive's own terms."},"complexity_factors":["Narrow applicability: applies only to Gulfstream 1 and TC4C aeroplanes (Applicability).","Single, clear recurring interval: inspections required within 100 hours after 29 August 1975 and every 100 hours thereafter (Compliance).","External technical reference: procedural detail is contained in Grumman Customer Bulletin No. 272 (Document), so the directive delegates technical procedure to that bulletin.","No conditional or exception language in the directive text; requirements are direct and time-based (Compliance)."],"plain_english_summary":"This directive mandates recurring inspections of the main landing gear uplock beam bracket on specified Gulfstream (Grumman) G.159 series aeroplanes (Gulfstream 1 and TC4C). Operators, owners and maintenance organisations must follow Grumman Customer Bulletin No. 272, with an initial inspection within 100 hours TIS after 29 Aug 1975 and repeats at intervals not exceeding 100 hours TIS."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-26-main-landing-gear-uplock-beam-bracket-inspection","history":"/api/acts/ad-g159-26-main-landing-gear-uplock-beam-bracket-inspection/history","analysis":"/api/acts/ad-g159-26-main-landing-gear-uplock-beam-bracket-inspection/analysis","conflicts":"/api/acts/ad-g159-26-main-landing-gear-uplock-beam-bracket-inspection/conflicts","importantCases":"/api/acts/ad-g159-26-main-landing-gear-uplock-beam-bracket-inspection/important-cases","documents":"/api/acts/ad-g159-26-main-landing-gear-uplock-beam-bracket-inspection/documents"}}