{"id":"F2006B10067","name":"AD/G159/22 Amdt 1 - Nose Landing Gear Downlock System - Inspection","slug":"ad-g159-22-amdt-1-nose-landing-gear-downlock-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55512,"registerId":"commonwealth-F2006B10067-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/22 Amdt 1 - Nose Landing Gear Downlock System - 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/G159/22 Amdt 1 Nose Landing Gear Downlock System -\n\nInspection\n\n\n2/74\n\n \n\nApplicability: All models.\n\n \n\nDocument: Grumman Customer Bulletin No. 238. Compliance:  As per requirement document.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied AD text does not state whether the scope changed from an earlier instrument. The document identifies itself as an amendment (\"Amdt 1\") but provides no comparison to prior scope or text. From the supplied content we can only record that the AD applies to all G.159 models and requires compliance with Grumman Customer Bulletin No. 238; no explicit change of scope is described in the text provided."},"complexity_factors":["Reference to an external requirement document (Grumman Customer Bulletin No. 238) rather than containing procedural detail in the AD increases follow-up work to obtain and interpret the bulletin (Document; Compliance).","Applicability to all G.159 models means the AD covers the entire fleet, so operators cannot exclude specific submodels (Applicability: All models).","Absence of inspection intervals, steps, or corrective-action detail in the AD text makes immediate compliance planning impossible from the AD alone (Compliance: As per requirement document).","Administrative tracking due to amendment status (\"Amdt 1\") requires users to confirm they are working to the current AD/bulletin combination (Title contains Amdt 1).","Technical competence requirement: inspections and any corrective maintenance will require qualified maintenance personnel and possibly parts/equipment (implied by subject matter: downlock system inspection)."],"plain_english_summary":"This AD mandates inspections of the nose landing gear downlock system for all Gulfstream (Grumman) G.159 series aeroplanes, directing operators to comply with the procedures and timing in Grumman Customer Bulletin No. 238.  \n\nIt affects aircraft owners/operators and maintenance organisations, creating a legal inspection obligation that may increase maintenance activity, costs and downtime; the AD delegates procedural detail to the referenced bulletin rather than embedding intervals or steps."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific mechanical inspection. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section; all language is plain technical aviation terminology","Single cross-reference to external technical document (Grumman Customer Bulletin No. 238)","No conditional logic, exceptions, or nested provisions","Simple binary applicability: 'All models' with no exclusions or carve-outs"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of **Gulfstream G.159 series aeroplanes** (originally built by Grumman) to inspect the **nose landing gear downlock system**. The \"downlock system\" is the mechanism that locks the front wheel in place when the landing gear is extended for landing — if it fails, the gear could collapse on touchdown.\n\n**Who must comply:** Anyone who owns or operates any model of the Gulfstream G.159 aircraft.\n\n**How to comply:** Operators must follow the instructions in **Grumman Customer Bulletin No. 238** — a technical document from the manufacturer specifying exactly what to inspect and how.\n\n**Why it matters:** Landing gear failures are catastrophic. This directive ensures a specific mechanical defect is caught before it causes an accident. Non-compliance means the aircraft cannot legally fly in Australian airspace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-22-amdt-1-nose-landing-gear-downlock-system-inspection","history":"/api/acts/ad-g159-22-amdt-1-nose-landing-gear-downlock-system-inspection/history","analysis":"/api/acts/ad-g159-22-amdt-1-nose-landing-gear-downlock-system-inspection/analysis","conflicts":"/api/acts/ad-g159-22-amdt-1-nose-landing-gear-downlock-system-inspection/conflicts","importantCases":"/api/acts/ad-g159-22-amdt-1-nose-landing-gear-downlock-system-inspection/important-cases","documents":"/api/acts/ad-g159-22-amdt-1-nose-landing-gear-downlock-system-inspection/documents"}}