{"id":"F2008L02480","name":"AD/PA-31/49 - Elevator Hinge System - Modification - CANCELLED","slug":"ad-pa-31-49-elevator-hinge-system-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74425,"registerId":"commonwealth-F2008L02480-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-31 Series Aeroplanes","sectionType":"division","heading":"Piper PA-31 Series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-31/49 | Elevator Hinge System - 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 the elevator hinge system in accordance with Piper SB No. 504. The AD required compliance within 100 hours TIS after August 1976 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-31/49","sectionType":"part","heading":"AD/PA-31/49","content":"## AD/PA-31/49","sortOrder":1},{"sectionNumber":"Elevator Hinge System - Modification","sectionType":"part","heading":"Elevator Hinge System - Modification","content":"## Elevator Hinge System - 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":1244},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument performs a straightforward administrative cancellation of a superseded airworthiness directive without expanding, restricting, or altering the underlying regulatory scheme."},"complexity_factors":["Single operative provision (cancellation of previous directive)","No defined terms or interpretation section","No conditional logic, cross-references, or exceptions","Extremely short length (under 150 words)"],"plain_english_summary":"This document cancels an outdated aviation safety rule for **Piper PA-31 Navajo aircraft**.\n\n**What was cancelled:**\nAn earlier directive required a one-time mechanical modification to the **elevator hinge system** (the pivot points connecting the horizontal tail control surfaces to the aircraft). Owners had to complete this work in accordance with Piper Service Bulletin No. 504 within 100 flight hours after August 1976.\n\n**Why it matters:**\nBecause the compliance deadline passed more than 30 years ago, every affected aircraft would already have undergone this modification. This cancellation simply removes the obsolete requirement from the aviation safety regulations. **No action is required** by current aircraft owners or operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-49-elevator-hinge-system-modification-cancelled","history":"/api/acts/ad-pa-31-49-elevator-hinge-system-modification-cancelled/history","analysis":"/api/acts/ad-pa-31-49-elevator-hinge-system-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-31-49-elevator-hinge-system-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-31-49-elevator-hinge-system-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-31-49-elevator-hinge-system-modification-cancelled/documents"}}