{"id":"F2006B10089","name":"AD/G159/45 - MLG Uplock Beam Forward Brackets","slug":"ad-g159-45-mlg-uplock-beam-forward-brackets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55565,"registerId":"commonwealth-F2006B10089-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/45 - MLG Uplock Beam Forward Brackets","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/G159/45 MLG Uplock Beam Forward Brackets 10/97\n\nApplicability: Serial numbers 1 to 12, 14 to 83, and 114.\n\n \n\nRequirement: Replace MLG uplock beam bracket part numbers 159W10150-51 and -52 with bracket part numbers 159W10150-71and -72.\n\n \n\nNote: FAA AD 97-14-08 refers.\n\n \n\nCompliance: Unless already accomplished, before issue of Australian Certificate of Airworthiness. Background:               This directive provides terminating action for a repetitive inspection in the FAA AD.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive confines action to the listed serial numbers and requires a specific parts replacement to terminate a repetitive inspection referenced in FAA AD 97-14-08. The text does not expand the set of affected aircraft or add requirements beyond that replacement, so the scope aligns with the stated terminating-action purpose (Applicability; Requirement; Background; Note)."},"complexity_factors":["Single, discrete mechanical action required (replacement of two part numbers) (Requirement)","Narrow applicability limited to specific serial numbers (Applicability)","Single compliance deadline tied to certificate issuance (Compliance)","Reference to external FAA AD for context but no additional procedural detail provided (Note; Background)","Practical implementation issues (parts availability, maintenance scheduling) are not specified in the text (Requirement; Compliance)"],"plain_english_summary":"This airworthiness directive requires owners/operators of specified Gulfstream G.159 serial numbers to replace main landing gear uplock beam forward brackets with designated new part numbers before an Australian Certificate of Airworthiness is issued. The one‑time parts swap (at owner expense) is stated to terminate the repetitive inspection mandated by the referenced FAA AD, enabling certification once compliance is demonstrated."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive. It has not expanded beyond its original purpose of addressing a specific mechanical defect in specific aircraft serial numbers. The scope remains precisely limited to the MLG uplock beam bracket replacement."},"complexity_factors":["Extremely short document (under 200 words)","Only 3 substantive sections: Applicability, Requirement, and Compliance","No defined terms section — all language is plain technical aviation terminology","Single, unambiguous action required (part replacement)","No conditional logic, exceptions, or nested provisions","Cross-reference to FAA AD is informational only, not a complex incorporation by reference"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety fix for aircraft. Specifically, it applies to certain **Gulfstream G.159 aeroplanes** (a type of business aircraft).\n\n**What it does:**\n- Requires owners/operators to replace specific **main landing gear (MLG) brackets** — the parts that help lock the wheels up when the plane is flying.\n- The old brackets (part numbers ending in -51 and -52) must be swapped for stronger ones (ending in -71 and -72).\n\n**Who it affects:**\n- Owners and operators of G.159 aircraft with **serial numbers 1–12, 14–83, and 114**.\n\n**When it must be done:**\n- Before the aircraft can get (or keep) its **Australian Certificate of Airworthiness** — the official document saying the plane is safe to fly.\n\n**Why it matters:**\n- This fix **ends the need for repetitive inspections** that were previously required by an American (FAA) safety directive. Instead of constantly checking the old brackets, you replace them once and you're done.\n- Faulty landing gear brackets could potentially cause the gear to not lock properly — a serious safety issue.\n\n**Key point:** This is a **terminating action** — meaning it permanently solves a problem that previously needed ongoing monitoring."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-45-mlg-uplock-beam-forward-brackets","history":"/api/acts/ad-g159-45-mlg-uplock-beam-forward-brackets/history","analysis":"/api/acts/ad-g159-45-mlg-uplock-beam-forward-brackets/analysis","conflicts":"/api/acts/ad-g159-45-mlg-uplock-beam-forward-brackets/conflicts","importantCases":"/api/acts/ad-g159-45-mlg-uplock-beam-forward-brackets/important-cases","documents":"/api/acts/ad-g159-45-mlg-uplock-beam-forward-brackets/documents"}}