{"id":"F2006B02051","name":"AD/AA-5/19 - Carburettor Heat Valve - Inspection and Modification","slug":"ad-aa-5-19-carburettor-heat-valve-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41273,"registerId":"commonwealth-F2006B02051-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AA-5/19 - Carburettor Heat Valve - Inspection and Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue NK,Aircraft below 5700 kg,Gulfstream (Grumman American/ American Aviation) AA-5 Series Aeroplanes,Carburettor Heat Valve - Inspection and Modification,19\ntitle: Airworthiness Directive - AD/AA-5/19 - Carburettor Heat Valve - Inspection and Modification\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 American/ American Aviation) AA-5 Series Aeroplanes\n\n \n\nAD/AA-5/19 Carburettor Heat Valve - Inspection NK\n\nand Modification\n\n \n\nApplicability: All models AA-5 with S/Nos. AA5-0641 to AA5-0834, and all models AA-5A with S/Nos. AA5A-0001 to AA5A-0321.\n\n \n\nDocument: Grumman American SB No. 159.\n\n \n\nCompliance: 1. For Part 1 of the SB Instructions - before further flight.\n\n \n\n2. For Parts II and III of the SB Instructions - in accordance with the Service Bulletin.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrowly-targeted Airworthiness Directive addressing a specific safety issue in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection and modification of carburettor heat valves in the identified aircraft serial numbers."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined applicability criteria (serial number ranges)","Single external reference (Service Bulletin No. 159)","Simple two-stage compliance structure (immediate + scheduled)","No nested exceptions or conditional logic","No internal cross-references to other legislation","Straightforward command structure: 'do this before flying, do the rest later'"],"plain_english_summary":"This AD mandates owners/operators of certain Gulfstream (formerly Grumman/American) AA‑5 and AA‑5A aeroplanes with specified serial numbers to inspect and modify the carburettor heat valve. The initial inspection/modification (Part 1 of Service Bulletin No. 159) must be done before the next flight.\n\nFollow‑on work (Parts II and III of the same bulletin) must be completed per its timeline. It matters because a faulty carburettor heat valve can allow carburettor icing and lead to engine failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD itself sets the applicability (specific serial-number ranges) and compliance steps (Part I before further flight; Parts II and III per Service Bulletin No.159). The document contains no statement indicating the AD's scope has been altered from an earlier or original version."},"complexity_factors":["Narrow applicability by serial number ranges (AA5-0641 to AA5-0834; AA5A-0001 to AA5A-0321) increases administrative verification burden.","Immediate compliance requirement for Part I: 'before further flight' creates operational urgency and scheduling pressure.","Reliance on an external document: actions are defined by 'Grumman American SB No. 159', so implementers must obtain and follow that Service Bulletin.","Multiple staged requirements (Parts I, II and III) with different timings and potentially different technical actions.","Technical nature of the task (carburettor heat valve inspection/modification) requires qualified maintenance resources and possible parts, adding cost and logistics.","Regulatory basis cited (Civil Aviation Regulations 1998, PART 39) implies enforceability under CASA inspection/compliance regimes."],"plain_english_summary":"Requires owners/operators of specified Gulfstream (Grumman American) AA‑5 and AA‑5A aeroplanes (S/Ns AA5‑0641 to AA5‑0834 and AA5A‑0001 to AA5A‑0321) to inspect and modify the carburettor heat valve per Grumman American Service Bulletin No.159. Part I must be done before further flight; Parts II and III must be completed in accordance with the Service Bulletin. Owners/operators and maintenance organisations bear the cost and must decide and carry out the work to keep the affected aircraft airworthy."}},"importantCases":[],"_links":{"self":"/api/acts/ad-aa-5-19-carburettor-heat-valve-inspection-and-modification","history":"/api/acts/ad-aa-5-19-carburettor-heat-valve-inspection-and-modification/history","analysis":"/api/acts/ad-aa-5-19-carburettor-heat-valve-inspection-and-modification/analysis","conflicts":"/api/acts/ad-aa-5-19-carburettor-heat-valve-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-aa-5-19-carburettor-heat-valve-inspection-and-modification/important-cases","documents":"/api/acts/ad-aa-5-19-carburettor-heat-valve-inspection-and-modification/documents"}}