{"id":"F2007L04537","name":"AD/GENERAL/43 - Power Supply Connections to Hourmeters - CANCELLED","slug":"ad-general-43-power-supply-connections-to-hourmeters-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":71032,"registerId":"commonwealth-F2007L04537-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Aircraft - General","sectionType":"division","heading":"Aircraft - General","content":"### Aircraft - General\n\n| AD/GENERAL/43 | Power Supply Connections to Hourmeters | 13/2007 |\n| ------------- | -------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                 |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 20 December 2007.                                                                                                                                                  |\n| Background:  | This AD was issued in 1970 and required a modification to the circuit to prevent hour meter failures tripping protective devices. This was a one off modification. The AD is now obsolete. |\n\n![](image.001.png)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n18 October 2007","sortOrder":0},{"sectionNumber":"AD/GENERAL/43","sectionType":"part","heading":"AD/GENERAL/43","content":"## AD/GENERAL/43","sortOrder":1},{"sectionNumber":"Power Supply Connections to Hourmeters","sectionType":"part","heading":"Power Supply Connections to Hourmeters","content":"## Power Supply Connections to Hourmeters","sortOrder":2},{"sectionNumber":"13/2007","sectionType":"part","heading":"13/2007","content":"## 13/2007","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1650},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"Originally imposed mandatory modification requirements on aircraft electrical systems to prevent protective device tripping. This version completely removes those obligations, converting the instrument from an active safety mandate into a nullity."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references","Extensive regulatory history condensed to one sentence of effect"],"plain_english_summary":"This document cancels an old aircraft safety rule (Airworthiness Directive 43) that originally required owners to modify the power supply connections to aircraft hourmeters (flight time counters).\n\n**What it does:**\n- Formally cancels a 1970 safety directive that mandated a one-time electrical circuit modification\n- The original rule required changes to prevent hourmeter failures from tripping protective devices (circuit breakers or fuses)\n- The cancellation took effect on 20 December 2007\n\n**Why it matters:**\nThe required modifications were completed long ago on all affected aircraft. Since this was a one-off fix rather than an ongoing maintenance requirement, the directive became obsolete and has been removed from the aviation safety rules."}},"importantCases":[],"_links":{"self":"/api/acts/ad-general-43-power-supply-connections-to-hourmeters-cancelled","history":"/api/acts/ad-general-43-power-supply-connections-to-hourmeters-cancelled/history","analysis":"/api/acts/ad-general-43-power-supply-connections-to-hourmeters-cancelled/analysis","conflicts":"/api/acts/ad-general-43-power-supply-connections-to-hourmeters-cancelled/conflicts","importantCases":"/api/acts/ad-general-43-power-supply-connections-to-hourmeters-cancelled/important-cases","documents":"/api/acts/ad-general-43-power-supply-connections-to-hourmeters-cancelled/documents"}}