{"id":"F2006B10052","name":"AD/G1159/9 - Fuselage Aft Pressure Dome - Inspection and Modification","slug":"ad-g1159-9-fuselage-aft-pressure-dome-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55494,"registerId":"commonwealth-F2006B10052-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G1159/9 - Fuselage Aft Pressure Dome - Inspection and 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/G1159/9 Fuselage Aft Pressure Dome - Inspection\n\nand Modification\n\nApplicability: All models with S/Nos. 3 to 125. Document:  Grumman Customer Bulletin No. 167.\n\nCompliance: Within 100 hours time in service after 31 October 1973.\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\n\n10/73\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1973 addressing a specific structural inspection on specific aircraft. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 defined elements: applicability (serial number range), reference document, compliance deadline, and aircraft type","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance action with clear deadline","No conditional logic, exceptions, or alternative compliance methods","Vintage 1973 directive with simple prescriptive format typical of early aviation safety orders"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Gulfstream business jets to inspect and modify a critical part of the aircraft.\n\n**What it does:**\n- **Targets:** Gulfstream G1159 and G-IV series aircraft with serial numbers 3 through 125\n- **The problem:** The \"fuselage aft pressure dome\" — the rear part of the cabin that keeps air pressure inside the plane at high altitude — needs checking and fixing\n- **The fix:** Operators must follow Grumman Customer Bulletin No. 167 (the manufacturer's official repair instructions)\n- **Deadline:** Within 100 hours of flying time after 31 October 1973\n\n**Why it matters:**\nThe pressure dome is vital for keeping cabin pressure safe. If it fails, passengers and crew could lose oxygen at altitude. This AD ensures potentially dangerous structural issues get caught and fixed before they cause an accident.\n\n**Who must comply:**\nAnyone operating these specific Gulfstream aircraft in Australia — including airlines, charter companies, and private owners."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive explicitly applies to all G1159 and G‑IV series aeroplanes with serial numbers 3 to 125 and requires compliance within a fixed time (100 hours after 31 October 1973) by following Grumman Customer Bulletin No. 167. There is no indication in the supplied text that the applicability, method of compliance, or deadline were altered from the instrument as recorded here; therefore the scope as set out appears unchanged. (See “Applicability”, “Document” and “Compliance”.)"},"complexity_factors":["Short, prescriptive text with a single clear compliance deadline (low internal complexity). (See “Compliance”.)","Applicability limited to a defined serial number range, making scope clear but narrow. (See “Applicability”.)","Substantive technical details and procedures are absent from the directive and delegated to an external manufacturer document (Grumman Customer Bulletin No. 167), increasing practical complexity because operators must obtain and follow that bulletin. (See “Document”.)","No stated alternative means of compliance or waiver process in the text supplied, which can create administrative complexity in practice if deviations are needed. (Absence noted relative to “Document” and “Compliance”.)","Fixed short compliance window (100 hours) increases operational scheduling complexity for aircraft operators. (See “Compliance”.)"],"plain_english_summary":"Owners/operators of Gulfstream (Grumman) G1159/G‑IV aeroplanes (S/N 3–125) were required to obtain Grumman Customer Bulletin No. 167 and complete the specified inspection and any required modification to the fuselage aft pressure dome within 100 hours TIS after 31 Oct 1973. Issued under the Commonwealth Schedule of Airworthiness Directives by the Civil Aviation Safety Authority, it shifts technical compliance to the manufacturer’s bulletin and imposes direct cost and scheduling burdens on operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g1159-9-fuselage-aft-pressure-dome-inspection-and-modification","history":"/api/acts/ad-g1159-9-fuselage-aft-pressure-dome-inspection-and-modification/history","analysis":"/api/acts/ad-g1159-9-fuselage-aft-pressure-dome-inspection-and-modification/analysis","conflicts":"/api/acts/ad-g1159-9-fuselage-aft-pressure-dome-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-g1159-9-fuselage-aft-pressure-dome-inspection-and-modification/important-cases","documents":"/api/acts/ad-g1159-9-fuselage-aft-pressure-dome-inspection-and-modification/documents"}}