{"id":"F2009L01929","name":"AD/AA-5/18 - Circuit Protection Separation - Modification - CANCELLED","slug":"ad-aa-5-18-circuit-protection-separation-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":79052,"registerId":"commonwealth-F2009L01929-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Gulfstream (Grumman American/ American A","sectionType":"division","heading":"Gulfstream (Grumman American/ American Aviation) AA-5 Series Aeroplanes","content":"### Gulfstream (Grumman American/ American Aviation) AA-5 Series Aeroplanes\n\n| AD/AA-5/18 | Circuit Protection Separation - Modification | 6/2009 |\n| ---------- | -------------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                             |\n| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 4 June 2009.                                                                                                                                                                                                   |\n| Background:  | This AD, issue in 1977, required modification of the circuit protection. The AD compliance was within 100 hours time in service after 28 February 1977. As all aircraft would have been modified by now, the AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n24 April 2009","sortOrder":0},{"sectionNumber":"AD/AA-5/18","sectionType":"part","heading":"AD/AA-5/18","content":"## AD/AA-5/18","sortOrder":1},{"sectionNumber":"Circuit Protection Separation - Modifica","sectionType":"part","heading":"Circuit Protection Separation - Modification","content":"## Circuit Protection Separation - Modification","sortOrder":2},{"sectionNumber":"6/2009","sectionType":"part","heading":"6/2009","content":"## 6/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2291},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument remains strictly limited to its original purpose of cancelling the 1977 airworthiness directive concerning circuit protection modifications for AA-5 series aircraft. It does not expand to cover other aircraft types or safety issues."},"complexity_factors":["Single-operation instrument (cancellation only) with no substantive regulatory requirements","No definitions section or interpretation clauses","No conditional provisions, exceptions, or nested logic","No cross-references to other legislative provisions beyond the historical reference to the 1977 directive"],"plain_english_summary":"This document officially scraps an outdated aircraft safety rule. **What it is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under Commonwealth aviation law. **What it does:** Cancels directive AD/AA-5/18, originally issued in 1977, which required owners of Gulfstream/Grumman American AA-5 series aeroplanes to modify their electrical circuit protection systems. **Why it matters:** The original rule required aircraft owners to complete modifications within 100 flight hours after February 1977. Because that deadline passed over 30 years ago, CASA cancelled the directive in June 2009 on the basis that all affected aircraft would long since have been modified. **Who is affected:** Owners and operators of AA-5 series aircraft, though in practice the cancellation merely removes an obsolete requirement that was complied with decades ago."}},"importantCases":[],"_links":{"self":"/api/acts/ad-aa-5-18-circuit-protection-separation-modification-cancelled","history":"/api/acts/ad-aa-5-18-circuit-protection-separation-modification-cancelled/history","analysis":"/api/acts/ad-aa-5-18-circuit-protection-separation-modification-cancelled/analysis","conflicts":"/api/acts/ad-aa-5-18-circuit-protection-separation-modification-cancelled/conflicts","importantCases":"/api/acts/ad-aa-5-18-circuit-protection-separation-modification-cancelled/important-cases","documents":"/api/acts/ad-aa-5-18-circuit-protection-separation-modification-cancelled/documents"}}