{"id":"F2006B10090","name":"AD/G159/46 - MLG Retract Cylinder Attachment Fittings","slug":"ad-g159-46-mlg-retract-cylinder-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55570,"registerId":"commonwealth-F2006B10090-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/46 - MLG Retract Cylinder Attachment Fittings","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/G159/46 MLG Retract Cylinder Attachment Fittings 10/97\n\nApplicability: Serial Numbers 1 to 12, 14 to 112, 114 to 148 and 322 and 323\n\n \n\nRequirement: Replace MLG retract cylinder attachment fitting assemblies with assemblies containing Part Number 159WM10276-1 and -2, and balls Part Number 159WM10277-1.\n\n \n\nNote: FAA AD 97-14-10 refers.\n\n \n\nCompliance: Unless already accomplished, before issue of Australian Certificate of Airworthiness.\n\n \n\nThis airworthiness directive becomes effective on 11 September 1997.\n\n \n\nBackground: 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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument does not indicate a change in scope from the FAA AD; it states that the replacement provides terminating action for the repetitive inspection in the referenced FAA AD (Background). The directive applies only to the listed G.159 serial numbers and requires the specified part-number replacement before issuance of an Australian Certificate of Airworthiness (Applicability; Requirement; Compliance), which is consistent with a targeted, aircraft-specific corrective action rather than an expansion of scope."},"complexity_factors":["Narrow applicability defined by specific serial number ranges (Applicability).","Mandatory replacement of component assemblies identified by exact part numbers (Requirement).","Compliance deadline tied to administrative milestone (before issue of Australian Certificate of Airworthiness) rather than a calendar interval (Compliance).","Cross-reference to a foreign authority directive (FAA AD 97-14-10) which modifies prior inspection requirements (Note; Background).","No detailed procedural or technical installation instructions in the text — requires reliance on external maintenance data or FAA AD for execution."],"plain_english_summary":"This directive requires specified Gulfstream (Grumman) G.159 aeroplanes (listed by serial number in the instrument) to have their main landing gear retract cylinder attachment assemblies replaced with parts 159WM10276-1/ -2 and balls 159WM10277-1 before an Australian Certificate of Airworthiness is issued (unless already done).  \n\nIt provides terminating action for the repetitive inspection in FAA AD 97-14-10, trading ongoing inspections for a one‑time parts replacement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a limited fleet of aircraft. It has not expanded beyond its original purpose of mandating a hardware replacement to address landing gear safety concerns."},"complexity_factors":["Very short document (under 200 words)","Only 3 defined part numbers","Single, unambiguous requirement (replace specific assemblies)","No nested exceptions or conditional logic","Clear applicability list (specific serial numbers)","Simple compliance trigger (before Certificate of Airworthiness issuance)","No cross-references to other Australian legislation (only notes related FAA AD for context)"],"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 originally built by Grumman).\n\n**What it does:**\n- Requires owners/operators to **replace specific parts** on the **Main Landing Gear (MLG)** — the wheels that support the plane on the ground.\n- The parts being replaced are the \"retract cylinder attachment fitting assemblies\" — components that help the landing gear fold up into the aircraft after take-off.\n- The new parts must use specific part numbers: **159WM10276-1 and -2** for the fittings, and **159WM10277-1** for the balls (likely ball bearings or spherical joints).\n\n**Who it affects:**\n- Owners and operators of G.159 aircraft with **specific serial numbers** (roughly serials 1–148, excluding 13 and 113, plus two later aircraft: 322 and 323).\n\n**Why it matters:**\n- This directive provides **\"terminating action\"** for a repetitive inspection requirement from an earlier US (FAA) safety order. \n- In plain terms: instead of repeatedly checking the old parts for cracks or wear, you permanently fix the problem by installing improved parts. This makes maintenance simpler and safer.\n- **Compliance is mandatory** before the aircraft can get (or keep) its Australian Certificate of Airworthiness — meaning no Australian registration without this fix.\n\n**Key deadline:** The directive took effect on **11 September 1997**, and compliance was required before airworthiness certification."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-46-mlg-retract-cylinder-attachment-fittings","history":"/api/acts/ad-g159-46-mlg-retract-cylinder-attachment-fittings/history","analysis":"/api/acts/ad-g159-46-mlg-retract-cylinder-attachment-fittings/analysis","conflicts":"/api/acts/ad-g159-46-mlg-retract-cylinder-attachment-fittings/conflicts","importantCases":"/api/acts/ad-g159-46-mlg-retract-cylinder-attachment-fittings/important-cases","documents":"/api/acts/ad-g159-46-mlg-retract-cylinder-attachment-fittings/documents"}}