{"id":"F2006B02231","name":"AD/AIRIND/1 - Brackett Aircraft Specialities Air Inlet Filter Assembly Inspection","slug":"ad-airind-1-brackett-aircraft-specialities-air-inlet-filter-assembly-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41461,"registerId":"commonwealth-F2006B02231-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AIRIND/1 - Brackett Aircraft Specialities Air Inlet Filter Assembly Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAir Induction Systems\n\nAD/AIRIND/1 Brackett Aircraft Specialities Air Inlet\n\nFilter Assembly Inspection\n\n  \n2/79\n\nApplicability: Brackett Aircraft Specialities engine air inlet filter assemblies model Nos. BA-4106, BA-4210, BA-5110, BA-6110 and BA-8110.\n\nRequirement: With foam element removed from the air filter assembly, inspect the aluminium diamond mesh retainer for cracks or failed areas.\n\nIf cracks or failed areas are found replace retainer before further flight with a steel screen, P/N. as listed below, or refit the aircraft manufacturer’s original air filter assembly.\n\nFor Filter Assembly P/N Use Steel Screen P/N\n\nBA-4106, BA-4210 BA-4109\n\nBA-5110, BA-6110 BA-5101\n\nBA-8110 BA-8109\n\nNote: The air inlet filter assemblies are fitted to, but not necessarily limited to, the following aircraft:\n\nFilter Model Aircraft\n\n    BA-4106 Cessna 150, 150A to M, A150L and A150M. Piper PA-20, PA-20-115 and PA-20-135.\n\n    2. BA-4210 Grumman American AA-1, AA-1A, AA-1B and AA-5. 3. BA-5110 Cessna 170, 170A, 170B, 172 and 172A to M.\n    4. BA-6110 Mooney M20, M20A, M20B, M20C, M20D and M20G.\n\n    5. BA-8110 Cessna 180C to K, 182Bto Q, 185, 185A to E and A185F.\n\nCompliance: Within 100 hours time in service after 31 March 1979 and thereafter at intervals not exceeding 100 hours time in service until the aluminium diamond mesh retainer is replaced with a steel screen, P/N. as applicable, or the aircraft manufacturer’s original air filter assembly is refitted.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope, as stated, is limited to inspecting and replacing aluminium diamond‑mesh retainers on the listed Brackett filter assemblies and prescribing specific steel screen part numbers or the original manufacturer assembly; the text contains no provision that expands or narrows that scope beyond these measures (Applicability, Requirement, Compliance)."},"complexity_factors":["Applicability is narrowly defined by specific Brackett filter part numbers and a list of common aircraft types (Applicability).","Procedure requires a physical inspection with the foam element removed and a judgement about cracks or failed areas (Requirement).","Replacement options are prescribed and mapped to filter P/Ns (Requirement: specific steel screen P/Ns listed), creating a parts‑sourcing task for operators.","Fixed compliance timing — initial inspection within 100 hours after 31 March 1979 and repeating every 100 hours until replacement — imposes a predictable maintenance schedule (Compliance).","Operational impact on owners/operators: inspection labour, possible immediate grounding until replacement, and part costs (Requirement & Compliance).","Low administrative discretion: the directive mandates action 'before further flight' if defects are found, leaving little regulatory latitude (Requirement).","Potential supply or logistics risk if specified steel screens are not readily available, which can affect downtime and compliance timing (implied by listed P/N replacements)."],"plain_english_summary":"This airworthiness directive requires operators of aircraft fitted with specified Brackett engine air inlet filter assemblies to remove the foam element and inspect the aluminium diamond-mesh retainer for cracks, and to replace any defective retainer with a listed steel screen or the aircraft manufacturer’s original filter assembly before further flight. Compliance must occur within 100 hours time‑in‑service after 31 March 1979 and then every 100 hours until the aluminium retainer is replaced; it affects aircraft owners, operators and maintenance providers who use those filter models."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in particular aftermarket air filter assemblies. It has not expanded beyond its original purpose of ensuring the airworthiness of these specific components."},"complexity_factors":["Single, specific mechanical issue addressed (cracked aluminium mesh retainers)","Only 5 specific part numbers affected","Clear two-step compliance path: inspect, then replace if necessary","Simple recurring inspection interval (100 hours time in service)","No nested definitions, cross-references to other legislation, or conditional exceptions","Straightforward lookup table matching filter models to replacement part numbers and affected aircraft types"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of aircraft fitted with Brackett filter models BA-4106, BA-4210, BA-5110, BA-6110 or BA-8110 to inspect the aluminium diamond mesh retainer for cracks and, if damaged, replace it with a specified steel screen or reinstall the OEM filter. Inspections start within 100 flight hours and repeat every 100 hours until the permanent fix is fitted. It prevents debris bypassing the filter and possible in‑flight engine damage or failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-airind-1-brackett-aircraft-specialities-air-inlet-filter-assembly-inspection","history":"/api/acts/ad-airind-1-brackett-aircraft-specialities-air-inlet-filter-assembly-inspection/history","analysis":"/api/acts/ad-airind-1-brackett-aircraft-specialities-air-inlet-filter-assembly-inspection/analysis","conflicts":"/api/acts/ad-airind-1-brackett-aircraft-specialities-air-inlet-filter-assembly-inspection/conflicts","importantCases":"/api/acts/ad-airind-1-brackett-aircraft-specialities-air-inlet-filter-assembly-inspection/important-cases","documents":"/api/acts/ad-airind-1-brackett-aircraft-specialities-air-inlet-filter-assembly-inspection/documents"}}