{"id":"F2006B02232","name":"AD/AIRIND/2 Amdt 2 - Brackett Air Filter Gasket","slug":"ad-airind-2-amdt-2-brackett-air-filter-gasket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41462,"registerId":"commonwealth-F2006B02232-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AIRIND/2 Amdt 2 - Brackett Air Filter Gasket","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/2\n\nAmdt 2\n\n  \nBrackett Air Filter Gasket 8/99\n\nApplicability: Aircraft fitted with one of the following Brackett Aircraft Company air filter assemblies fitted as original equipment or in accordance with Supplemental Type Certificate (STC) SA71GL or STC SA693CE:\n\n| BA-2010 | BA-5110A | BA-4106 | BA-6110 | BA-4106-1 |\n| ------- | -------- | ------- | ------- | --------- |\n| BA-8910 | BA-4210  | AAF-117 | BA-5110 | AAF-118   |\n\nRequirement: To prevent particles from a defective gasket entering the carburettor which may result in partial or complete loss of engine power:\n\n1. a. Visually inspect the air filter frame internally and externally for evidence of gasket looseness, movement or deterioration in accordance with Brackett Air Filter Document 1-194, and\n\n    b. Replace any air filter assembly found to have a defective gasket with an air filter assembly as detailed in Requirement 2 of this directive.\n\n    2. Replace the air filter assembly, as applicable, with one of the following air filter assemblies which incorporate a retainer lip:\n\n| ORIGINAL AIR FILTER | REPLACEMENT      | BRACKETT INSTRUCTION SHEET |\n| ------------------- | ---------------- | -------------------------- |\n| BA-2010             | BA-2010 Rev. A   | BA-2004                    |\n| BA-4106             | BA-4106 Rev. D   | BA-4105                    |\n| BA-4106-1           | BA-4106-1 Rev. A | RM-1                       |\n| BA-4210             | BA-4210 Rev. B   | BA-4205                    |\n| BA-5110             | BA-5110 Rev. H   | BA-5105                    |\n| BA-5110A            | BA-5110 Rev. D   | BA-5111                    |\n| BA-6110             | BA-6110 Rev. C   | BA-6105                    |\n| BA-8910             | BA-8910 Rev. B   | BA-8910-3                  |\n| AAF-117             | BA-4106 Rev. D   | BA-4105                    |\n| AAF-118             | BA-5110 Rev. H   | BA-5105                    |\n\nCompliance with Requirement 2 constitutes terminating action for the repetitive inspection requirement of this directive.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nNote 1: A copy of Brackett Air Filter Document 1-194 may be obtained from the local Airworthiness District Office.\n\nNote 2: FAA Airworthiness Directive 96-09-06 refers.\n\nCompliance: 1\\. a. Unless previously accomplished, within 100 hours’ time in service, and thereafter at intervals not to exceed 130 hours’ time in service effective 12 September 1996.\n\n    b. Before further flight.\n\n    2. Within 500 hours’ time in service effective 12 September 1996\\. This Amendment becomes effective on 12 August 1999.\n\nBackground: This directive was issued in May 1995 to require an inspection of certain Brackett air inlet filters for evidence of a defective gasket. The requirement addressed a report of an accident resulting from failure of an air inlet filter gasket. This amendment introduces a minor editorial change to clarify the terminating action.\n\nAmendment 1 to this Airworthiness Directive became effective on 12 September 1996.\n\nThe original issue of this Airworthiness Directive became effective on 25 May 1995.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Amendment 2 represents a minor editorial clarification only. The scope remains identical to the original 1995 directive and Amendment 1 (1996) — addressing the same gasket defect in the same Brackett filter models. The amendment merely clarifies that Requirement 2 constitutes terminating action for the repetitive inspections, which was likely always the intent but is now explicitly stated."},"complexity_factors":["Multiple cross-references to external documents (Brackett Document 1-194, various Brackett Instruction Sheets, FAA AD 96-09-06)","Two-tier compliance structure with different timeframes (100/130 hours for inspections vs 500 hours for replacement)","Conditional terminating action logic (Requirement 2 ends Requirement 1 obligations)","10 specific air filter models mapped to 10 different replacement part numbers and instruction sheets","Applicability depends on original equipment manufacturer (OEM) fitment or two specific Supplemental Type Certificates (STCs)","Three effective dates referenced (original May 1995, Amendment 1 September 1996, Amendment 2 August 1999)"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of aircraft fitted with specific Brackett air filter assemblies to inspect for deteriorating or loose gaskets (risking gasket fragments entering the carburettor and causing engine power loss) and to replace any defective assembly before flight. Inspections are required within 100 flight hours and every 130 hours thereafter, with mandatory replacement by 500 hours.\n\nInstalling the revised filter assembly with a retainer lip ends the recurring inspection requirement."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment does not materially expand the directive's original purpose. The original AD (1995) required inspection because of gasket failures; this Amendment 2 makes a minor editorial change to clarify that installing the listed replacement assemblies (Requirement 2) is the terminating action for the repetitive inspections. It therefore clarifies implementation without broadening the subject matter or adding new operational obligations beyond the existing inspection and replacement regime (Requirement 1–2; Background)."},"complexity_factors":["Short directive: single-safety-issue focus (gasket deterioration/retainer lip)","Applicability lists 10 specific Brackett/AAF part numbers","Two-step requirements: repetitive inspection (Requirement 1) and replacement terminating action (Requirement 2)","Three compliance time points to track (initial 100 hours, repeat 130 hours, replacement within 500 hours)","Cross-reference to external service document (Brackett Document 1-194) and to an FAA AD (96-09-06)","Replacement mapping table (original part → revised replacement → instruction sheet) creating specific parts obligation","Notes on where to obtain the inspection procedure (administrative step)","Amendment/history information (original AD, Amendment 1, this amendment) but only minor editorial change"],"plain_english_summary":"**What this directive does**\n\n- This airworthiness directive (AD) requires owners/operators of aircraft that use certain Brackett air filter assemblies to inspect those filter assemblies for signs that the gasket (the seal around the filter) is loose, has moved, or is deteriorating, and to replace the filter assembly if the gasket is defective. (Requirement 1.a–b)\n\n- The AD also prescribes a set of approved replacement filter assemblies (revised Brackett part numbers that include a retainer lip) that, once fitted, stop the need for the repeated inspections. (Requirement 2)\n\n**Which aircraft are affected**\n\n- Aircraft fitted, either as original equipment or under Supplemental Type Certificates SA71GL or SA693CE, with any of the Brackett filter assemblies listed in the applicability table (for example BA-2010, BA-4106, BA-5110 and others). (Applicability)\n\n**Why this matters**\n\n- The gasket can fail and allow particles to enter the carburettor, which may cause partial or complete loss of engine power. The AD responds to a reported accident caused by a gasket failure. (Background)\n\n**What operators must do, step by step**\n\n- Inspect: Unless already done, perform a visual inspection of the air filter frame (inside and outside) for looseness, movement or deterioration of the gasket in accordance with Brackett Air Filter Document 1-194. Do this within 100 hours time-in-service and then repeat at intervals not exceeding 130 hours. (Requirement 1.a; Compliance)\n\n- Replace immediately: If a defective gasket is found, replace the air filter assembly before further flight. (Requirement 1.b; Compliance)\n\n- Terminating action: Replace the existing filter assembly with the specified revised Brackett part (each original has a listed replacement revision that includes a retainer lip). Installing one of those listed replacement assemblies terminates the need for the repetitive inspections. Do the replacement within 500 hours time-in-service. (Requirement 2; Compliance)\n\n**Where to get the inspection procedure and cross-reference**\n\n- The Brackett inspection document (Document 1-194) is available from the local Airworthiness District Office. The AD also refers to a related FAA AD (96-09-06). (Note 1; Note 2)\n\n**Who pays and who decides**\n\n- Aircraft owners/operators pay for inspection labour and for replacement filter assemblies if needed. Maintenance organisations (licensed mechanics or authorised maintenance organisations) perform the inspection and replacement and certify compliance with the AD. The Civil Aviation Safety Authority (CASA) enforces the AD. (Requirement 1–2; Compliance)\n\n**Behavioural and market effects, implementation issues and trade-offs**\n\n- Incentives: Operators have a clear incentive to fit the approved replacement assemblies (Requirement 2) because that eliminates the ongoing inspection burden.\n\n- Costs: Short-term costs include inspection time every 130 hours until replacement, and the purchase and fitting cost of replacement assemblies (Requirement 1–2; Compliance). Those costs fall on aircraft owners/operators.\n\n- Supply and downtime risk: If replacement filter assemblies are scarce or take time to obtain, operators may face downtime while complying with the 500-hour replacement requirement and the requirement to ground an aircraft until a defective gasket is replaced (Requirement 1.b; Requirement 2; Compliance).\n\n- Competition and choice: The AD prescribes specific Brackett replacement part revisions. Operators cannot substitute alternative parts unless approved by the regulator; this concentrates demand on the specified parts and on maintenance providers able to fit them. (Requirement 2)\n\n- Enforcement and documentation: Compliance must be recorded in maintenance logs as with other ADs; CASA may audit or take enforcement action for non‑compliance. (General AD practice; Compliance)\n\n- Risk reduction vs. recurring burden: The AD trades a recurring inspection burden against a one-off replacement cost: replacement terminates the inspection requirement, so the long-run burden depends on how many operators choose to replace immediately versus continue inspections until replacement is scheduled.\n\n**Source claims and testing them against costs/risks**\n\n- The AD’s stated purpose is to prevent particles entering the carburettor from a defective gasket (Background). That purpose is implemented mechanically by inspection requirements and by mandating replacement with parts that incorporate a retainer lip (Requirement 1–2). The practical costs are the inspection labour and replacement parts; benefits are reduced risk of engine power loss. The directive shifts immediate recurring inspection costs into a one‑time replacement cost if operators elect to adopt the terminating action. Availability of parts and maintenance capacity are the main implementation risks. (Requirement 1–2; Compliance; Background)\n\n**Key citations**\n\n- Applicability (list of affected Brackett part numbers)\n- Requirement 1.a–b (inspection and immediate replacement if gasket defective)\n- Requirement 2 (approved replacement assemblies and terminating action)\n- Compliance times (100/130/500 hours) and effective dates\n- Note 1 (how to obtain Brackett Document 1-194) and Note 2 (reference to FAA AD 96-09-06)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-airind-2-amdt-2-brackett-air-filter-gasket","history":"/api/acts/ad-airind-2-amdt-2-brackett-air-filter-gasket/history","analysis":"/api/acts/ad-airind-2-amdt-2-brackett-air-filter-gasket/analysis","conflicts":"/api/acts/ad-airind-2-amdt-2-brackett-air-filter-gasket/conflicts","importantCases":"/api/acts/ad-airind-2-amdt-2-brackett-air-filter-gasket/important-cases","documents":"/api/acts/ad-airind-2-amdt-2-brackett-air-filter-gasket/documents"}}