{"id":"F2006B10048","name":"AD/G1159/5 - High Pressure Fuel Cock - Modification","slug":"ad-g1159-5-high-pressure-fuel-cock-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55483,"registerId":"commonwealth-F2006B10048-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G1159/5 - High Pressure Fuel Cock - Modification","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 Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes\n\n \n\nAD/G1159/5 High Pressure Fuel Cock - Modification 5/72\n\nApplicability: All models with S/Nos. 1 to 107 and 775.\n\n \n\nDocument: Grumman Gulfstream II Service Change No. 120 and Amendment 1. Compliance: Within 100 hours time in service after 31 May 1972.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1392},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument maintains its original narrow scope: a specific airframe modification for specific aircraft models. There is no evidence of expansion beyond the original safety intent."},"complexity_factors":["Single, unambiguous operative requirement","No interpretation section or defined terms","Specific, narrow applicability (limited serial number ranges)","Incorporates external technical standard by reference (Service Change No. 120)"],"plain_english_summary":"**What this does:** This Airworthiness Directive (AD) orders owners or operators of specific Gulfstream business jets to modify the aircraft's high pressure fuel cock (a valve controlling fuel flow).\n\n**Who it affects:** Operators of Gulfstream II (model G1159) and G-IV series aircraft with serial numbers 1 to 107 and 775.\n\n**What must be done:** The fuel cock must be modified exactly as described in the manufacturer's technical document — *Grumman Gulfstream II Service Change No. 120* (including Amendment 1).\n\n**Deadline:** The modification had to be completed within 100 hours of flight time after 31 May 1972 (meaning this is a historical directive that would already apply to any remaining eligible aircraft).\n\n**Why it matters:** Airworthiness Directives are legally binding safety orders. Non-compliance grounds the aircraft — it cannot legally fly until the work is done."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g1159-5-high-pressure-fuel-cock-modification","history":"/api/acts/ad-g1159-5-high-pressure-fuel-cock-modification/history","analysis":"/api/acts/ad-g1159-5-high-pressure-fuel-cock-modification/analysis","conflicts":"/api/acts/ad-g1159-5-high-pressure-fuel-cock-modification/conflicts","importantCases":"/api/acts/ad-g1159-5-high-pressure-fuel-cock-modification/important-cases","documents":"/api/acts/ad-g1159-5-high-pressure-fuel-cock-modification/documents"}}