{"id":"F2006B04842","name":"AD/CA-6/2 - Fuel Selector Cock - Inspection","slug":"ad-ca-6-2-fuel-selector-cock-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44646,"registerId":"commonwealth-F2006B04842-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CA-6/2 - Fuel Selector Cock - Inspection","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)  C.A.C. CA-6 (Wackett Trainer) Series Aeroplanes\n\n \n\nAD/CA-6/2 Fuel Selector Cock - Inspection NK\n\nApplicability: All models.\n\n \n\nRequirement: 1. Inspect the fuel selector cock and ensure that the backlash, as measured on the selector quadrant in the front cockpit, is not in excess of 15 degrees.\n\n \n\n2.    Also inspect the indexing cam in the cock itself to ensure that there is a pronounced click when the selector is indexed to its correct position.\n\n \n\n3.    Replace fuel cocks not meeting the requirements of paragraphs 1 and 2 of this Order or adjust to bring them within the required standard.\n\n \n\nCompliance: At intervals not exceeding 40 hours time in service.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text does not indicate any amendment or change to a prior instrument or to the originally intended applicability. The directive applies to \"All models\" and sets specific inspection, acceptance, and corrective requirements (Applicability; Requirement 1–3; Compliance). There is no language in the text showing an expansion or narrowing of scope relative to an earlier instrument."},"complexity_factors":["Clear, short set of mandatory actions (inspect backlash; inspect indexing cam; adjust or replace) reduces procedural complexity (Requirements 1–3).","Numeric standard for backlash (15 degrees) is precise but requires a measurement method and tool setup, adding practical complexity (Requirement 1).","Qualitative requirement for a \"pronounced click\" introduces subjectivity and potential variability between inspectors (Requirement 2).","Directive leaves technical methods, measurement procedures, and part specifications unspecified, creating operational discretion for maintainers (Requirements 1–3).","Recurring compliance interval (every 40 hours TIS) creates ongoing scheduling and logistical considerations for operators (Compliance)."],"plain_english_summary":"This directive requires operators and maintenance organisations of C.A.C. CA‑6 (Wackett Trainer) aircraft to inspect the front‑cockpit fuel selector cock at intervals not exceeding 40 hours: confirm selector backlash does not exceed 15° and that the indexing cam gives a pronounced click, and where either check fails, adjust or replace the cock. \n\nIt creates recurring maintenance obligations and cost exposure for operators, while leaving measurement methods, click criteria and specific adjustment/replacement procedures to maintainers' judgment."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive for a specific aircraft type. It has not expanded beyond its original purpose of ensuring fuel selector integrity in CAC CA-6 aircraft."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 3 simple, sequential requirements with no cross-references","Single defined term implied ('time in service') but not explicitly defined in this excerpt","No conditional logic, exceptions, or nested provisions","Single applicability criterion ('All models') with no carve-outs","Plain language instructions ('pronounced click', 'excess of 15 degrees')"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for a specific vintage aircraft: the **CAC CA-6 Wackett Trainer**.\n\n**What it does:**\nIt requires owners and operators of these World War II-era training aircraft to regularly inspect the fuel selector cock (the valve that switches between fuel tanks). Specifically:\n- Check that the control lever in the front cockpit doesn't have more than **15 degrees of slack or play** (called \"backlash\")\n- Verify that the selector makes a **clear clicking sound** when it locks into position\n- **Repair or replace** any fuel cocks that fail these tests\n\n**Who it affects:**\nAnyone who owns or operates a CAC CA-6 Wackett Trainer aircraft — a rare, historic military trainer from the 1940s.\n\n**Why it matters:**\nFuel selector failures can cause engine stoppage. If the selector doesn't lock properly or has excessive play, a pilot might think they're switching to a full fuel tank when they're actually cutting off fuel entirely — potentially causing a forced landing or crash. The 40-hour inspection interval ensures this critical component stays reliable.\n\n**Compliance deadline:**\nEvery 40 hours of flight time (\"time in service\")."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ca-6-2-fuel-selector-cock-inspection","history":"/api/acts/ad-ca-6-2-fuel-selector-cock-inspection/history","analysis":"/api/acts/ad-ca-6-2-fuel-selector-cock-inspection/analysis","conflicts":"/api/acts/ad-ca-6-2-fuel-selector-cock-inspection/conflicts","importantCases":"/api/acts/ad-ca-6-2-fuel-selector-cock-inspection/important-cases","documents":"/api/acts/ad-ca-6-2-fuel-selector-cock-inspection/documents"}}