{"id":"F2006B09441","name":"AD/ELECT/66 Amdt 1 - Bendix Magneto Coils and Rotating Magnets","slug":"ad-elect-66-amdt-1-bendix-magneto-coils-and-rotating-magnets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53866,"registerId":"commonwealth-F2006B09441-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ELECT/66 Amdt 1 - Bendix Magneto Coils and Rotating Magnets","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)  \nElectrical Equipment\n\nAD/ELECT/66\n\nAmdt 1\n\n  \nBendix Magneto Coils and Rotating Magnets 10/95\n\nApplicability: Teledyne Continental Motors (TCM) Ignition Systems (formerly Bendix) magnetos as listed below. Magnetos manufactured by Bendix in Jacksonville FL and those manufactured by TCM in Atlanta GA (as indicated on the data plate) are excluded.\n\nS-20, S-200 and S-600 series magnetos with either serial numbers below 2000000 without any letter prefix or with serial numbers below 16058 having the letter \\`A” prefix (for example A16057).\n\nS-20, S-200 and S-600 series magnetos with data plates marked\n\n\\`REMANUFACTURED” and with serial numbers below 901001.\n\nS-1200 series magnetos with either serial numbers below 2000000 without any letter prefix or with serial numbers below 132844 having the letter \\`A” prefix.\n\nS-1200 series magnetos with data plates marked \\`REMANUFACTURED” and with serial numbers below 901001.\n\nNote 1: CASA has received reports of some confusion as to what is meant by S-20, S- 200, S-600 and S-1200. A typical example is S6RN-25, where the \\`S” designates a single type ignition unit, the \\`6” designates the number of engine cylinders, the \\`R” designates right hand rotation, the \\`N” is the manufacturer designator (this did not change when TCM purchased the Bendix magneto product line) and the number after the dash indicates the series (a -25 is a S-20 series magneto, while a -1225 is a S- 1200 series magneto.\n\nNote 2: If a Bendix magneto data plate has been replaced with an overhaul facility's data plate, this Directive is still applicable to that magneto as the magneto is a Bendix magneto.\n\nNote 3: Yellow Bendix or TCM service spare data plates may have been installed during field overhaul, use the magneto model and serial number to determine the applicability of this Directive.\n\nNote 4: The paint on some early data plates may have been obliterated and the data plate may appear silver in colour, use the magneto model and serial number to determine the applicability of this Directive.\n\nRequirement: For Bendix S-20 and S-200 series magnetos, inspect and if necessary, replace Bendix ignition coils and rotating magnets identified in the Detailed Instructions of TCM Ignition Systems Mandatory Service Bulletin MSB644 dated 4 April 1994 with appropriate serviceable ignition coils and rotating magnets.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nFor the Bendix S-600 series magnetos, inspect and if necessary, replace Bendix rotating magnets identified in the Detailed Instructions of TCM Ignition Systems Mandatory Service Bulletin MSB644 dated 4 April 1994 with appropriate serviceable rotating magnets. (Ignition coils of the S-600 series magnetos already incorporate the improved design.)\n\nFor the Bendix S-1200 series magnetos, inspect and if necessary, replace Bendix ignition coils identified in the Detailed Instructions of TCM Ignition Systems Mandatory Service Bulletin MSB644 dated 4 April 1994 with appropriate serviceable ignition coils. (The rotating magnets of the S-1200 series magnetos already incorporate the improved design.)\n\nNote: Previous compliance with AD/ELECT/53 Amdt 2 or earlier issues of that Directive does not constitute full compliance with this Directive, similarly compliance with Bendix Electrical Components Division Service Bulletin 560 or 560A would not constitute full compliance.\n\nCompliance: The original compliance remains unchanged as within the next 100 hours time in service after 10 November 1994. This amendment is effective from 14 September 1995.\n\nNote: FAA AD 94-01-03 R2 Amdt 39-9271 refers.\n\nBackground: The original issue of this Directive superseded AD/ELECT/53 Amdt 2, which was cancelled. Reports are still being received of \\`clear case coils” being identified during magneto servicing, compliance with this Directive, whilst ensuring that all coils of this type are finally removed from Australian aircraft, will also ensure that older style rotating magnets are removed.\n\nThis amendment is issued to clarify the applicability statement and reflects the issue of a revision to the FAA Airworthiness Directive, no further action is required if magnetos are in compliance with the original issue of this Directive.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"This amendment principally clarifies the applicability language and aligns the Directive with a revised FAA airworthiness directive. It does not expand the technical obligations or add new types of work beyond the original Directive; compliance requirements, the required inspections/replacements and the 100-hour compliance window remain the same. The amendment therefore does not materially change the scope of the Directive compared with its original safety purpose, it refines which magnetos are covered and how to identify them (Applicability; Background)."},"complexity_factors":["Multiple magneto series with diverging requirements (S-20/S-200, S-600, S-1200) requiring different parts to be inspected/replaced","Serial-number thresholds with conditional letter-prefix rules (e.g. serials below 2000000 without letter prefix; serials below specific numbers with an 'A' prefix)","Separate applicability rules for units marked 'REMANUFACTURED' with different serial thresholds","Explicit exclusions tied to data-plate manufacturing location (Bendix Jacksonville FL and TCM Atlanta GA)","Four clarifying notes about model coding, replaced data plates, spare data plates, and obliterated paint that create extra identification work for maintainers","Cross-reference to an external mandatory service bulletin (TCM MSB644 dated 4 April 1994) for the detailed technical steps","Cross-reference to earlier ADs and FAA AD (historical cross-references and 'does not constitute full compliance' statements)","Compliance timing tied to a specific historical baseline (100 hours TIS after 10 Nov 1994) rather than a simple calendar deadline","Warnings that prior compliance with other directives or service bulletins may be insufficient (nested exceptions)","Amendment designed as a clarification rather than a substantive rewrite, creating conditional statements about when no further action is required"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- It requires inspection — and replacement if necessary — of certain Bendix/TCM magneto ignition coils and rotating magnets on specified magneto models and serial-number ranges. (See the \"Requirement\" and \"Applicability\" sections.)\n- The inspection and any replacements must follow the Detailed Instructions of TCM Ignition Systems Mandatory Service Bulletin MSB644 dated 4 April 1994. (Requirement)\n- Different actions apply by magneto series:\n  - S-20 and S-200 series: inspect and, if necessary, replace both ignition coils and rotating magnets. (Requirement)\n  - S-600 series: inspect and, if necessary, replace rotating magnets only (S-600 coils already have the improved design). (Requirement)\n  - S-1200 series: inspect and, if necessary, replace ignition coils only (S-1200 rotating magnets already have the improved design). (Requirement)\n- The compliance window is unchanged from the original directive: work must be done within the next 100 hours time-in-service after 10 November 1994. (Compliance)\n- The amendment clarifies which magnetos are covered and aligns the Directive with a revised FAA Airworthiness Directive; it does not impose additional follow‑up if you already complied with the original issue of this Directive. (Background)\n\n**Who this affects**\n\n- Aircraft owners/operators and maintenance organisations that operate or service aircraft fitted with Bendix (now marketed through TCM) S-20, S-200, S-600 and S-1200 series magnetos that fall within the serial-number criteria in the \"Applicability\" section.\n- Overhaul facilities and mechanics who must identify magneto models and serial numbers (even where data plates have been changed, repainted or replaced) to determine applicability. (Notes 1–4)\n- Suppliers of replacement ignition coils and rotating magnets, to the extent replacement parts are required.\n\n**Why it matters (stated purpose and practical implications)**\n\n- Stated purpose: to ensure older-design ignition coils and rotating magnets known to be problematic are removed from Australian aircraft, reducing the risk of magneto/ignition failure. (Background)\n\n- Practical effects and trade‑offs:\n  - Safety benefit (concentrated and direct): removal/replacement of identified parts should reduce the risk of ignition problems in affected magnetos. (Requirement / Background)\n  - Cost and compliance burden (diffuse): owners/operators must schedule inspections and pay for parts and labour where replacements are needed; the directive sets a firm 100-hour time-in-service deadline from the 10 November 1994 baseline. (Compliance)\n  - Identification friction: the applicability depends on model and serial-number rules and on data-plate information; where data plates have been replaced, repainted or obliterated, maintenance staff must rely on model and serial-number traces, which can increase inspection time and record checks. (Notes 1–4; Applicability)\n  - Administrative clarity: the amendment primarily clarifies which magnetos are covered and aligns the Directive with the FAA revision; it does not change the original compliance requirements if the magneto was already made compliant under the original Directive. (Background)\n\n**Key implementation points maintenance staff and owners should note**\n\n- Use the magneto model and serial number to determine whether the magneto is in scope; do not rely only on replacement or spare data plates. (Notes 2–4)\n- Follow TCM Mandatory Service Bulletin MSB644 (4 April 1994) for the detailed inspection and replacement steps required. (Requirement)\n- Previous compliance with an earlier AD (AD/ELECT/53 Amdt 2) or with Bendix Service Bulletins 560/560A does not necessarily mean full compliance with this Directive. (Note)\n\n**Where the instrument claims to act and what that implies for incentives and costs**\n\n- Who pays: aircraft owners/operators and their maintenance providers pay for inspections, parts and labour to meet the directive. (Requirement / Compliance)\n- Who decides: CASA enforces compliance under the Civil Aviation Regulations framework; individual maintenance organisations decide when and how to schedule inspections and source serviceable parts in order to meet the deadline. (Compliance / Requirement)\n- Behaviour change required: owners/operators must identify affected magnetos, conduct the specified inspections, and replace coils/magnets where the Service Bulletin identifies them as deficient. (Requirement)\n- Implementation risk and opportunity costs: locating correct serial/model data, sourcing appropriate replacement parts, and scheduling maintenance within the 100‑hour window create practical risks and costs for operators. (Applicability; Notes; Compliance)\n"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment is explicitly clarifying in nature only. The document states it 'is issued to clarify the applicability statement' and confirms 'no further action is required if magnetos are in compliance with the original issue of this Directive.' The scope remains limited to the specific Bendix magneto models and serial numbers originally targeted, with no expansion to additional equipment types or operational contexts."},"complexity_factors":["Multiple overlapping applicability criteria based on model series (S-20, S-200, S-600, S-1200), serial number ranges, letter prefixes, and manufacturing location","Four detailed explanatory notes clarifying data plate identification issues (replacement plates, yellow service plates, paint degradation)","Different technical requirements for each magneto series (some need coils replaced, some need magnets replaced, some need both)","Cross-reference to external technical document (TCM Service Bulletin MSB644) for detailed instructions","Explicit statement that previous compliance with related directives (AD/ELECT/53, Bendix SB 560/560A) does not satisfy this requirement","Reference to corresponding FAA Airworthiness Directive (94-01-03 R2) for harmonisation context"],"plain_english_summary":"This safety order requires owners, operators and maintenance organisations to inspect and remove certain older Bendix (Teledyne Continental Motors) magnetos with defective clear-case coils or aging rotating magnets, ensuring those unsafe parts are replaced. It excludes units made in Jacksonville or Atlanta. The 1995 amendment clarifies which magnetos are covered; compliance within the original 100 flight‑hour deadline (after 10 Nov 1994) satisfies the requirement."},"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-elect-66-amdt-1-bendix-magneto-coils-and-rotating-magnets","history":"/api/acts/ad-elect-66-amdt-1-bendix-magneto-coils-and-rotating-magnets/history","analysis":"/api/acts/ad-elect-66-amdt-1-bendix-magneto-coils-and-rotating-magnets/analysis","conflicts":"/api/acts/ad-elect-66-amdt-1-bendix-magneto-coils-and-rotating-magnets/conflicts","importantCases":"/api/acts/ad-elect-66-amdt-1-bendix-magneto-coils-and-rotating-magnets/important-cases","documents":"/api/acts/ad-elect-66-amdt-1-bendix-magneto-coils-and-rotating-magnets/documents"}}