{"id":"F2009L00207","name":"AD/PA-23/84 - Exhaust System - Inspection and Modification - CANCELLED","slug":"ad-pa-23-84-exhaust-system-inspection-and-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76674,"registerId":"commonwealth-F2009L00207-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-23 (Apache and Aztec) Series Ae","sectionType":"division","heading":"Piper PA-23 (Apache and Aztec) Series Aeroplanes","content":"### Piper PA-23 (Apache and Aztec) Series Aeroplanes\n\n| AD/PA-23/84 | Exhaust System - Inspection and Modification | 2/2009 |\n| ----------- | -------------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                              |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 12 February 2009.                                                                                                                                                                               |\n| Background:  | This unique Australian AD specified once-only inspection and modification of the exhaust system in accordance with Piper SB No. 662 within 100 hours time in service after December 1982. The AD is 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/PA-23/84","sectionType":"part","heading":"AD/PA-23/84","content":"## AD/PA-23/84","sortOrder":1},{"sectionNumber":"Exhaust System - Inspection and Modifica","sectionType":"part","heading":"Exhaust System - Inspection and Modification","content":"## Exhaust System - Inspection and 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":1985},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument performs exactly as intended—it simply cancels the previous Airworthiness Directive without expanding regulatory scope or creating new obligations."},"complexity_factors":["Single operative provision (cancellation of one previous directive)","No definitions or interpretation section","No cross-references to other legislation (only historical reference to the cancelled instrument)","No conditional logic, exceptions, or nested requirements"],"plain_english_summary":"**This document cancels a previous aircraft safety rule.**\n\nIf you own or operate a **Piper PA-23 Apache or Aztec** aeroplane, this removes a previous requirement to have your aircraft's exhaust system inspected and modified.\n\n**What changed:**\n- The previous rule required a one-time inspection and modification of the exhaust system according to the manufacturer's instructions (Piper Service Bulletin No. 662)\n- This work had to be completed within 100 hours of flight time after December 1982\n- **This cancellation means that specific requirement no longer applies**\n\n**Why this matters:**\nOwners and operators of these aircraft are no longer legally required to complete this specific exhaust system modification. This reduces regulatory compliance costs for these older aircraft, though they must still meet general airworthiness standards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-84-exhaust-system-inspection-and-modification-cancelled","history":"/api/acts/ad-pa-23-84-exhaust-system-inspection-and-modification-cancelled/history","analysis":"/api/acts/ad-pa-23-84-exhaust-system-inspection-and-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-23-84-exhaust-system-inspection-and-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-23-84-exhaust-system-inspection-and-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-23-84-exhaust-system-inspection-and-modification-cancelled/documents"}}