{"id":"F2008L02491","name":"AD/PA-31/6 - Attachment Of Rudder Tab Hinge Brackets - Modification - CANCELLED","slug":"ad-pa-31-6-attachment-of-rudder-tab-hinge-brackets-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74443,"registerId":"commonwealth-F2008L02491-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-31 Series Aeroplanes","sectionType":"division","heading":"Piper PA-31 Series Aeroplanes","content":"### Piper PA-31 Series Aeroplanes\n\n| AD/PA-31/6 | Attachment Of Rudder TabHinge Brackets - Modification | 8/2008 |\n| ---------- | ----------------------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                  |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 31 July 2008.                                                                                                                                                                                                                       |\n| Background:  | This unique Australian AD required once-only modification of rudder tab hinge brackets in accordance with Piper SL No. 512. The AD required compliance within 100 hours TIS after February 1969 so all affected aircraft would have been modified long ago. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n13 June 2008","sortOrder":0},{"sectionNumber":"AD/PA-31/6","sectionType":"part","heading":"AD/PA-31/6","content":"## AD/PA-31/6","sortOrder":1},{"sectionNumber":"Attachment Of Rudder TabHinge Brackets -","sectionType":"part","heading":"Attachment Of Rudder TabHinge Brackets - Modification","content":"## Attachment Of Rudder Tab  \nHinge Brackets - Modification","sortOrder":2},{"sectionNumber":"8/2008","sectionType":"part","heading":"8/2008","content":"## 8/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2631},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument represents the sunset of a spent airworthiness directive rather than an alteration of scope. The original safety requirement achieved its purpose decades ago, and this cancellation formally terminates the rule without expanding or modifying its historical scope."},"complexity_factors":["Single operative provision (cancellation)","No definitions or interpretation section","No conditional logic, exceptions, or nested provisions","Cross-reference limited to historical manufacturer service letter"],"plain_english_summary":"This instrument **cancels an obsolete aviation safety rule** that previously required owners of Piper PA-31 series aircraft to modify the hinge brackets on their plane's rudder tabs.\n\n**What the original rule required**\nThe previous directive mandated a one-time modification of rudder tab hinge brackets according to manufacturer specifications (Piper Service Letter No. 512). Aircraft operators had to complete this work within 100 hours of flight time after February 1969.\n\n**Why it was cancelled**\nBecause the compliance deadline passed decades ago, all affected aircraft were modified long ago. This instrument formally removes the expired safety requirement from the aviation regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-6-attachment-of-rudder-tab-hinge-brackets-modification-cancelled","history":"/api/acts/ad-pa-31-6-attachment-of-rudder-tab-hinge-brackets-modification-cancelled/history","analysis":"/api/acts/ad-pa-31-6-attachment-of-rudder-tab-hinge-brackets-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-31-6-attachment-of-rudder-tab-hinge-brackets-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-31-6-attachment-of-rudder-tab-hinge-brackets-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-31-6-attachment-of-rudder-tab-hinge-brackets-modification-cancelled/documents"}}