{"id":"F2006B09408","name":"AD/ELECT/20 - Eisemann Magneto Coils P/N H27-958 - Inspection and Replacement","slug":"ad-elect-20-eisemann-magneto-coils-p-n-h27-958-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53770,"registerId":"commonwealth-F2006B09408-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ELECT/20 - Eisemann Magneto Coils P/N H27-958 - Inspection and Replacement","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/20 Eisemann Magneto Coils\n\nP/N H27-958 \\- Inspection and Replacement\n\n  \n5/69\n\nApplicability: All Eisemann magnetos type AM-4, AM-6, LA-4 and LA-6 installed on, but not necessarily limited to, the following engines:\n\nContinental A-50, A-65, A-75, A-80, C-75, C-85, C-115, C-125, E-165 and E-185\n\nseries.\n\nFranklin (Aircooled) 2A4, 4AC, 4A4, 6AC, 6AL, 6A8, 6A4, 6V4, 6AG4 series. Menasco C4, D4, D4-87 series.\n\nRequirement: 1. Inspect coils P/N H27-958 for a yellow inspection stamp consisting of a letter and numeral.\n\n    2. Remove from further service those coils bearing the following yellow stamps:\n\nA76, B76, C76, D76, F76, G76, H76, J76, K76, L76, M76, D86, E86, F86, G86, H86, J86, K86.\n\n    3. Install coils P/N H27-958 bearing yellow inspection stamps other than those listed under 2.\n\nCompliance: Within 35 hours time in service after 16 May 1969.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument as provided defines its own applicability and requirements and does not indicate that those elements are a modification of a prior scope. The applicability language (\"installed on, but not necessarily limited to, the following engines\") broadens the practical reach beyond the listed engine series, but the directive itself does not record any change from an earlier stated scope."},"complexity_factors":["Narrow technical scope: applies to a single part number (P/N H27-958) and specific magneto models (AM-4, AM-6, LA-4, LA-6) (Applicability).","Identification method: compliance depends on reading a yellow inspection stamp (letter+numeral) on each coil (Requirement 1).","Discrete list of banned stamp codes: a finite enumerated list of stamps that must be removed (Requirement 2).","Prescriptive compliance deadline: a single short compliance window (35 hours time in service after 16 May 1969) (Compliance).","Broad applicability language: \"not necessarily limited to\" the listed engines increases the range of affected aircraft, requiring implementers to check beyond the enumerated engine series (Applicability)."],"plain_english_summary":"What this instrument does (mechanics):\n\n- The directive applies to all Eisemann magnetos of types AM-4, AM-6, LA-4 and LA-6 when they are installed on aircraft engines (the text lists a number of Continental, Franklin and Menasco engine series but says applicability is \"not necessarily limited to\" those engines) (Applicability).\n- It requires an inspection of magneto coils with part number H27-958 to look for a yellow inspection stamp consisting of a letter and numeral (Requirement 1).\n- If a coil bears any of the listed yellow stamps (A76, B76, C76, D76, F76, G76, H76, J76, K76, L76, M76, D86, E86, F86, G86, H86, J86, K86), that coil must be removed from service (Requirement 2).\n- Coils P/N H27-958 that bear yellow stamps other than the codes listed above may be installed (Requirement 3).\n- The inspection and any required removals/replacements had to be completed within 35 hours time in service after 16 May 1969 (Compliance).\n\nStated or implied purpose (as derived from the instrument):\n\n- The instrument prescribes removal of specific coils identified by certain inspection-stamp codes. The schedule itself does not set out a narrative justification in the text provided; operationally its effect is to identify and remove coils bearing particular yellow-stamp codes from service (Requirement 2).\n\nWho pays, who decides, and what behaviour changes: (plain declarative)\n\n- Who pays: aircraft owners/operators and their maintenance providers bear the direct costs of inspecting coils and, if necessary, removing and replacing coils P/N H27-958 (Requirement, Compliance).\n- Who decides: the regulator (Civil Aviation Safety Authority, via the Schedule of Airworthiness Directives) mandates the inspection and removal; maintenance personnel carry out the inspection and replacement (Applicability, Requirement).\n- Behaviour changes required: inspect coils for the yellow letter+number stamp; remove coils with any of the specified stamp codes; install coils only if their yellow stamp is not on the banned list (Requirement 1–3).\n\nPractical trade-offs, costs and incentive effects (mechanisms, not judgments):\n\n- Compliance cost and time: operators must allocate maintenance labour time and potentially pay for replacement coils. The directive fixes a short regulatory window for action (35 hours time in service from the stated date) which can require prioritising affected aircraft for early maintenance (Compliance).\n- Supply and substitution effects: the requirement allows continued use of the same part number (P/N H27-958) provided the stamp is not in the banned list (Requirement 3). If acceptable coils in adequate supply are limited, operators may need to source alternate approved magnetos or parts, which affects procurement and maintenance choice.\n- Concentration of costs and benefits: the direct expense and work fall on individual owners/operators and maintenance providers; the directive’s intended benefit (removing specified coils from service) is diffuse across aircraft users and those exposed to aircraft operations. The text itself lists the affected stamps, creating a clearly targeted set of parts for removal (Requirement 2).\n- Compliance and implementation risk: the action hinges on visual identification of a yellow letter+numeral stamp. That creates a clear compliance rule but also relies on correct inspection and record-keeping by maintenance personnel (Requirement 1).\n- Bureaucratic discretion: the directive sets a prescriptive rule (specific P/N, specific stamp codes, mandated removal and allowable instalment). The text leaves little operational discretion to maintenance personnel beyond determining the stamp present on the part (Requirement 1–3).\n\nNoted limits in the source text:\n\n- The schedule does not supply a technical explanation for why the listed stamp codes must be removed; the text is prescriptive about which coils to remove and when to act (Requirement, Compliance).\n- Applicability is phrased broadly (\"installed on, but not necessarily limited to, the following engines\"), which extends the mechanical effect beyond the engines listed in the instrument (Applicability)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific defective aircraft part. It has not expanded beyond its original purpose of identifying and removing faulty Eisemann magneto coils from service."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined terms implicitly used (Applicability, Requirement, Compliance)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Simple conditional logic: if stamp matches list → remove; if stamp doesn't match → keep","Single compliance deadline with clear metric (35 hours time in service)","Specific part numbers and engine models listed explicitly rather than using broad categorical definitions"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners and mechanics to take specific action to fix a known safety problem.\n\n**What it does:**\nThis directive targets a specific faulty aircraft part — **Eisemann magneto coils** (part number H27-958) used in certain aircraft engines. Magnetos are critical components that generate the electrical spark needed to keep piston aircraft engines running.\n\n**Who it affects:**\n- Aircraft with **Eisemann magnetos** (models AM-4, AM-6, LA-4, LA-6) installed on specific **Continental, Franklin, and Menasco engines**\n- Aircraft owners, operators, and maintenance engineers responsible for these engines\n\n**What must be done:**\n1. **Inspect** the magneto coils for a yellow inspection stamp (a letter-number code)\n2. **Remove and replace** any coils stamped with these specific codes: A76, B76, C76, D76, F76, G76, H76, J76, K76, L76, M76, D86, E86, F86, G86, H86, J86, or K86\n3. **Keep** coils with any other yellow stamp codes\n\n**Why it matters:**\nThe listed stamp codes identify a batch of coils with a manufacturing defect that could cause engine failure in flight. This directive prevents potentially catastrophic engine stoppages by forcing removal of the faulty parts before they fail.\n\n**Deadline:**\nAircraft operators had to complete this inspection and any necessary replacements within **35 hours of flight time** after 16 May 1969."}},"importantCases":[],"_links":{"self":"/api/acts/ad-elect-20-eisemann-magneto-coils-p-n-h27-958-inspection-and-replacement","history":"/api/acts/ad-elect-20-eisemann-magneto-coils-p-n-h27-958-inspection-and-replacement/history","analysis":"/api/acts/ad-elect-20-eisemann-magneto-coils-p-n-h27-958-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-elect-20-eisemann-magneto-coils-p-n-h27-958-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-elect-20-eisemann-magneto-coils-p-n-h27-958-inspection-and-replacement/important-cases","documents":"/api/acts/ad-elect-20-eisemann-magneto-coils-p-n-h27-958-inspection-and-replacement/documents"}}