{"id":"F2006B08540","name":"AD/CHA/14 - Carburettor Airbox Alternate Air Valve","slug":"ad-cha-14-carburettor-airbox-alternate-air-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51318,"registerId":"commonwealth-F2006B08540-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CHA/14 - Carburettor Airbox Alternate Air Valve","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)  American Champion (Aeronca, Bellanca) Series Aeroplanes\n\n \n\nAD/CHA/14 Carburettor Airbox Alternate Air Valve 10/75\n\nApplicability: Models: 7ECA with S/Nos 723-70 and subsequent. 7GCAA with S/Nos 205-70 and subs. 7GCBC with S/Nos 202-70 and subs. 7KCAB with S/Nos 202-70 and subs.\n\n8KCAB with S/Nos 4-71 and subs. 8GCBC with S/Nos 1-74 and subs.\n\n \n\nRequirement: Inspect the carburettor airbox alternate air valve for cracking and security of attachment.\n\n \n\nNote: Incorporation of a Bellanca Service Kit does not cancel this repetitive inspection.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 1975 and there-after at intervals not exceeding 100 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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument, as presented, remains focused on requiring periodic inspections of the carburettor airbox alternate air valve for cracking and secure attachment on the listed aeroplane models and serial numbers. The text sets the inspection requirement, the timing (initial and recurring 100‑hour intervals), and clarifies that fitting a Bellanca Service Kit does not remove the inspection obligation. The document does not indicate any expansion or narrowing of that scope relative to the content within the AD itself."},"complexity_factors":["Narrow technical scope: single component (carburettor airbox alternate air valve) on specific models and serial-number ranges (Applicability).","Recurring schedule requirement with fixed flight‑hour interval (first within 100 hours after 31 October 1975, then every 100 hours) (Compliance).","Lack of procedural detail: the AD states what to inspect (cracking and security) but does not provide inspection methods, pass/fail criteria, or corrective action steps (Requirement).","Interplay with aftermarket modification: explicit note that a Bellanca Service Kit does not cancel the inspection obligation (Note).","Regulatory context: issued as an Airworthiness Directive under Civil Aviation Safety Authority regime, creating a statutory compliance obligation (header)."],"plain_english_summary":"What this instrument does (mechanically):\n\n- It requires a physical inspection of the carburettor airbox alternate air valve on a defined set of American Champion (Aeronca, Bellanca) series aeroplanes (see “Applicability”). (Applicability; Requirement)\n\nWho and what is affected:\n\n- Affected aeroplane models and serial-number ranges are listed under “Applicability.” The inspection applies only to those specific models and serial-numbered aeroplanes. (Applicability)\n\nWhat the inspection must check and the schedule:\n\n- The inspection must look for cracking in the alternate air valve and check that the valve is securely attached. (Requirement)\n- The first inspection must be completed within 100 hours time in service after 31 October 1975, and then repeated at intervals not exceeding 100 hours time in service. (Compliance)\n- Fitting a Bellanca Service Kit does not cancel the requirement for these repetitive inspections. (Note)\n\nStated rationale and how it is supported by the text:\n\n- The AD text itself does not include an explicit statement of policy rationale beyond the inspection requirement. The direct textual effect is to impose a recurring check on the physical condition and attachment security of the alternate air valve. (Requirement; Compliance)\n\nCosts, incentives and trade-offs (text‑based):\n\n- Who pays: the owners/operators of the listed aeroplanes will bear the direct costs of performing the inspections and any corrective work discovered by them, because the instrument requires the inspections to be carried out on those aircraft. (Applicability; Requirement; Compliance)\n- Compliance burden: inspections recur every 100 flight hours, requiring scheduling of maintenance time and potential downtime. The AD does not specify the inspection technique or acceptance criteria, which may increase labour time or require higher‑skill maintenance input. (Requirement; Compliance)\n- Discretion and implementation risk: the AD sets what to inspect (cracking and security of attachment) but does not define detailed pass/fail standards or methods; this leaves interpretation of acceptable condition and the choice of inspection method to maintenance personnel or the regulator’s supporting material. (Requirement)\n- Interaction with modifications: installing a Bellanca Service Kit does not remove the inspection obligation, so owners who fit that kit still must perform the inspections. That affects the expected private benefit from fitting the kit. (Note)\n\nEffects on private choice and operation (mechanical consequences):\n\n- Operators must schedule and perform repeated checks on the alternate air valve according to the stated hour limits; if cracking or insecure attachment is found, corrective maintenance will be required before further operation. (Requirement; Compliance)\n\nConcentrated benefits and diffuse costs (mechanism, text-based):\n\n- The text creates a recurring inspection requirement that directly imposes costs on the specific operators of listed aircraft (concentrated costs). Any safety or reliability benefits would accrue to users and the general flying public (diffuse benefits), but the AD itself does not quantify those benefits. (Applicability; Requirement)\n\nAuthority and context:\n\n- This instrument appears in the Schedule of Airworthiness Directives under the Civil Aviation Safety Authority framework (header). The AD is therefore a mandatory maintenance requirement for the listed aircraft while it remains in force. (Header; Schedule of Airworthiness Directives)\n\nKey citations in the instrument: Applicability; Requirement; Note; Compliance."},"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 component in specific aircraft. It has not expanded beyond its original purpose of ensuring the airworthiness of the carburettor airbox alternate air valve in the identified American Champion models."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability criterion (specific aircraft models and serial numbers)","Single, straightforward inspection requirement with no conditional logic or exceptions","No cross-references to other legislation or regulations","Simple compliance schedule (100 hours recurring)","One brief note clarifying that a service kit doesn't cancel the requirement"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nRequires owners and operators of certain American Champion aeroplanes (including models 7ECA, 7GCAA, 7GCBC, 7KCAB, 8KCAB, and 8GCBC with specific serial numbers) to **inspect the carburettor airbox alternate air valve** for cracks and to check it's securely attached.\n\n**Why it matters:**\nThe carburettor airbox alternate air valve is a component that controls airflow to the engine's carburettor. If it cracks or comes loose, it could cause engine failure — a serious safety risk in flight. This AD was issued to prevent accidents caused by this specific mechanical failure.\n\n**Who must comply:**\nAnyone operating the affected American Champion aircraft models in Australia.\n\n**When and how often:**\n- First inspection: within 100 hours of flying time after 31 October 1975\n- Repeat inspections: every 100 hours of flying time thereafter\n\n**Important note:** Even if you've installed a Bellanca Service Kit (an upgrade or fix from the manufacturer), you still must keep doing these inspections — the kit doesn't exempt you from this requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cha-14-carburettor-airbox-alternate-air-valve","history":"/api/acts/ad-cha-14-carburettor-airbox-alternate-air-valve/history","analysis":"/api/acts/ad-cha-14-carburettor-airbox-alternate-air-valve/analysis","conflicts":"/api/acts/ad-cha-14-carburettor-airbox-alternate-air-valve/conflicts","importantCases":"/api/acts/ad-cha-14-carburettor-airbox-alternate-air-valve/important-cases","documents":"/api/acts/ad-cha-14-carburettor-airbox-alternate-air-valve/documents"}}