{"id":"F2006B02081","name":"AD/AC/22 - Induction Air Control Valves and Mounting Shafts - Replacement","slug":"ad-ac-22-induction-air-control-valves-and-mounting-shafts-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41311,"registerId":"commonwealth-F2006B02081-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/22 - Induction Air Control Valves and Mounting Shafts - Replacement","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 7/1962,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Induction Air Control Valves and Mounting Shafts - Replacement,22\ntitle: Airworthiness Directive - AD/AC/22 - Induction Air Control Valves and Mounting Shafts - Replacement\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/22 Induction Air Control Valves and Mounting Shafts - Replacement\n\nApplicability: Model 680F: S/Nos. 871 to 1170. Document:  1. Aero Commander SB No. 76A; or\n\n2. FAA AD 62-5-1.\n\n \n\nCompliance: Forthwith.\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\n7/62\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating replacement of faulty induction air control valves."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (model and serial number range)","Simple binary compliance path (two acceptable reference documents)","No nested conditions, exceptions, or cross-references to other legislation","Single unambiguous action required (replacement of specified parts)","Immediate compliance deadline with no phased implementation"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires specific repairs or inspections on aircraft.\n\n**What it does:** It orders the replacement of induction air control valves and their mounting shafts on certain Twin Commander aircraft (specifically Model 680F with serial numbers 871 to 1170). These parts control airflow into the engine, and faulty components could cause engine failure or power loss.\n\n**Who it affects:** Owners and operators of specific Twin Commander 680F aeroplanes (serial numbers 871–1170) — these are small twin-engine aircraft typically used for private, charter, or utility operations.\n\n**What must be done:** The valves and shafts must be replaced immediately (\"forthwith\"). Operators must follow either:\n- Aero Commander Service Bulletin No. 76A, **or**\n- FAA Airworthiness Directive 62-5-1 (the equivalent US safety order)\n\n**Why it matters:** This prevents potentially catastrophic engine failures caused by defective induction air control components. Compliance is mandatory — flying without completing this work would violate civil aviation safety regulations."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text sets a targeted requirement: replacement of induction air control valves and mounting shafts for Model 680F aircraft with serial numbers 871–1170 and requires immediate compliance. The instrument does not indicate any expansion or narrowing of that applicability beyond what is stated, nor does it amend or repeal other provisions. Therefore there is no evidence in this text that the scope has changed from its stated applicability."},"complexity_factors":["Narrow applicability limited to Model 680F serial numbers 871–1170 (Applicability)","Single mandatory action (replacement of specified parts) with immediate compliance (Compliance: Forthwith)","Reliance on two external technical documents for the method of compliance (Aero Commander SB No. 76A; FAA AD 62-5-1) (Document)","Technical maintenance work requiring certified personnel and parts, which is operationally simple but technically specific","Limited regulatory discretion in the AD text — requirement is prescriptive rather than options-based (heading + Compliance)"],"plain_english_summary":"This AD mandates immediate replacement of the induction air control valves and their mounting shafts on Twin Commander Model 680F aircraft S/N 871–1170. Compliance is required \"forthwith\" and must follow the procedures in Aero Commander Service Bulletin No. 76A or FAA AD 62-5-1.\n\nIt affects owners/operators and maintenance providers, who bear the costs and scheduling burden. The directive is issued by the Civil Aviation Safety Authority under Part 39."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-22-induction-air-control-valves-and-mounting-shafts-replacement","history":"/api/acts/ad-ac-22-induction-air-control-valves-and-mounting-shafts-replacement/history","analysis":"/api/acts/ad-ac-22-induction-air-control-valves-and-mounting-shafts-replacement/analysis","conflicts":"/api/acts/ad-ac-22-induction-air-control-valves-and-mounting-shafts-replacement/conflicts","importantCases":"/api/acts/ad-ac-22-induction-air-control-valves-and-mounting-shafts-replacement/important-cases","documents":"/api/acts/ad-ac-22-induction-air-control-valves-and-mounting-shafts-replacement/documents"}}