{"id":"F2006B10062","name":"AD/G159/18 Amdt 2 - Life Limited Components - Retirement","slug":"ad-g159-18-amdt-2-life-limited-components-retirement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55507,"registerId":"commonwealth-F2006B10062-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/18 Amdt 2 - Life Limited Components - Retirement","content":"COMMONWEALTH OF AUSTRALIA CIVIL AVIATION ORDERS CIVIL AVIATION SAFETY AUTHORITY PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nGULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES\n\nAD/G159/18 Amdt 2 Life Limited Components \\- Retirement 12/81\n\nApplicability: All models.\n\nRequirement: Retire from service the components detailed below: COMPONENT PART NUMBER RETIREMENT TIME\n\nWing-Fuselage Connection 159W10017, 159WM10018, 50,000 Hours 159WM10019\n\nFlap Tracks 159WM10079, 159WM10080, 35,000 159WM10081, 159WM10082, Landings 159WM10083, 159WM10084,\n\nFlap Carriages 159AM10001, 159AM10002, 35,000 159AM10003, 159AM10004\n\nLandings\n\nCOMPONENT PART NUMBER RETIREMENT TIME\n\nFlap Hinge Fittings 159CSM10051, 159CSM10052, 20,000 159CSM10053,\n\n159CSM10054. Landings\n\nMain Landing Gear 172252 (1 \\- 24) Adapter, Strut Actuator Mounting 173625 (25 and Subs.) 2,500 Landings\n\nFor aircraft having no record of the number of landings, one landing per flying hours is to be assumed.\n\nCompliance: At or before the retirement times specified in Para. 1.\n\nBackground: The Directive has been revised to eliminate the control surfaces and associated hinge lives as stipulated in Gulfstream American Mandatory SB No. 316.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. The Background states the Directive was revised to eliminate control surfaces and their associated hinge lives from the list of life‑limited items, per Gulfstream American Mandatory SB No. 316, so the set of mandated retirements was altered from the prior version."},"complexity_factors":["Multiple component types each have different retirement measures (flight hours vs landings) and thresholds (Requirement section).","Specific part numbers are listed, increasing administrative tracking and inventory/parts sourcing burden (Requirement section).","Conversion rule for missing records — assume one landing per flying hour — creates a conservative compliance baseline and recordkeeping incentive (‘For aircraft having no record...’).","Compliance timing is strict: retirement must occur at or before the listed times, requiring proactive tracking and maintenance planning (Compliance).","Amendment changes prior coverage by eliminating control surfaces and hinge lives, requiring operators to reconcile previous inspections/records (Background).","Applicability to “All models” broadens the directive’s reach and removes model‑specific exemptions (Applicability)."],"plain_english_summary":"This directive requires operators of Gulfstream (Grumman) G.159 series aircraft to retire specified life‑limited structural components at set flight‑hour or landing thresholds. It sets mandatory removal points for items such as wing‑fuselage connections, flap gear and a landing‑gear adapter, and tells operators without landing records to count one landing per flight hour.\n\nThe rule matters to aircraft owners and maintenance organisations because it creates enforceable replacement dates, imposes recordkeeping and scheduling obligations, and leads to direct replacement and downtime costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope — prescribing retirement times for specific life-limited components on Gulfstream G.159 aircraft. The amendment simply removes control surface requirements that are now handled separately by manufacturer service bulletin, without expanding the directive's coverage to new aircraft types or systems."},"complexity_factors":["Single operational directive with straightforward compliance requirement","Only 4 component categories with specific part numbers and retirement thresholds","Minimal conditional logic (only one assumption rule for missing landing records)","No cross-references to other legislation or complex defined terms","Short document (approximately 200 words) with tabular data presentation","Single amendment note in background section"],"plain_english_summary":"This safety directive requires owners/operators of Gulfstream G.159 aeroplanes to permanently retire specific life‑limited structural and landing‑gear components at set usage limits (wing‑fuselage parts, flap tracks/carriages, flap hinge fittings, and main‑gear actuator adapters) and to assume one landing per flight hour if landing records are absent. It protects against metal fatigue–related failures by forcing replacement before parts exceed safe lifespans and removes prior control‑surface requirements covered elsewhere."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-18-amdt-2-life-limited-components-retirement","history":"/api/acts/ad-g159-18-amdt-2-life-limited-components-retirement/history","analysis":"/api/acts/ad-g159-18-amdt-2-life-limited-components-retirement/analysis","conflicts":"/api/acts/ad-g159-18-amdt-2-life-limited-components-retirement/conflicts","importantCases":"/api/acts/ad-g159-18-amdt-2-life-limited-components-retirement/important-cases","documents":"/api/acts/ad-g159-18-amdt-2-life-limited-components-retirement/documents"}}