{"id":"F2009L00167","name":"AD/ELECT/7 - Magneto - BTH Gear - Modification - CANCELLED","slug":"ad-elect-7-magneto-bth-gear-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76603,"registerId":"commonwealth-F2009L00167-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Electrical Equipment","sectionType":"division","heading":"Electrical Equipment","content":"### Electrical Equipment\n\n| AD/ELECT/7 | Magneto - BTH Gear - Modification | 2/2009 |\n| ---------- | --------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                            |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 12 February 2009.                                                                                                                                                                                                                                                                                             |\n|              | This unique Australian AD raised prior to 1964 against BTH Mod. CM 419; or ANO 107.2.16.3.4 requiring a modification to the BTH gear of all BTH type AG4 and SG4 magnetos.Compliance was before installation in an aircraft.As all affected magnetos would have been modified by now, this AD is considered to be no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n23 December 2008","sortOrder":0},{"sectionNumber":"AD/ELECT/7","sectionType":"part","heading":"AD/ELECT/7","content":"## AD/ELECT/7","sortOrder":1},{"sectionNumber":"Magneto - BTH Gear - Modification","sectionType":"part","heading":"Magneto - BTH Gear - Modification","content":"## Magneto - BTH Gear - Modification","sortOrder":2},{"sectionNumber":"2/2009","sectionType":"part","heading":"2/2009","content":"## 2/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1839},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the Airworthiness Directive entirely rather than expanding or altering its scope. The cancellation reflects the successful completion of the original safety mandate, not a policy shift."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms or interpretation section","No cross-references to other legislative provisions","No conditional logic, exceptions, or procedural steps"],"plain_english_summary":"**This instrument cancels an obsolete aircraft safety rule about ignition systems.**\n\nThis legislation officially scraps Airworthiness Directive (AD) ELECT/7, a decades-old requirement that mandated a specific gear modification for certain aircraft magnetos (ignition components made by British Thomson-Houston, models AG4 and SG4).\n\n**What it does:**\n- **Removes a redundant rule:** The original directive (dating to before 1964) required a mechanical modification to the BTH gear before these magnetos could be legally installed in aircraft.\n- **Housekeeping:** Because all affected magnetos would have been modified long ago, the authority determined the safety requirement was no longer needed.\n\n**Who it affects:**\n- Aircraft maintenance providers and operators who may still have historical records referencing this AD.\n- Anyone researching vintage aircraft ignition systems.\n\nThis is a straightforward administrative cancellation to clear obsolete technical requirements from the aviation safety register."}},"importantCases":[],"_links":{"self":"/api/acts/ad-elect-7-magneto-bth-gear-modification-cancelled","history":"/api/acts/ad-elect-7-magneto-bth-gear-modification-cancelled/history","analysis":"/api/acts/ad-elect-7-magneto-bth-gear-modification-cancelled/analysis","conflicts":"/api/acts/ad-elect-7-magneto-bth-gear-modification-cancelled/conflicts","importantCases":"/api/acts/ad-elect-7-magneto-bth-gear-modification-cancelled/important-cases","documents":"/api/acts/ad-elect-7-magneto-bth-gear-modification-cancelled/documents"}}