{"id":"F2009L00957","name":"AD/PA-42/1 - Powerplant Firewall - Inspection - CANCELLED","slug":"ad-pa-42-1-powerplant-firewall-inspection-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78473,"registerId":"commonwealth-F2009L00957-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-42 (Cheyenne III) Series Aeropl","sectionType":"division","heading":"Piper PA-42 (Cheyenne III) Series Aeroplanes","content":"### Piper PA-42 (Cheyenne III) Series Aeroplanes\n\n| AD/PA-42/1 | Powerplant Firewall - Inspection | 4/2009 |\n| ---------- | -------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 9 April 2009.                                                                                                                                                                     |\n| Background:  | This unique Australian AD specified inspection for unplugged holes in the firewall in accordance with Piper SB No. 727 within 100 hours time in service after October 1981. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n18 February 2009","sortOrder":0},{"sectionNumber":"AD/PA-42/1","sectionType":"part","heading":"AD/PA-42/1","content":"## AD/PA-42/1","sortOrder":1},{"sectionNumber":"Powerplant Firewall - Inspection","sectionType":"part","heading":"Powerplant Firewall - Inspection","content":"## Powerplant Firewall - Inspection","sortOrder":2},{"sectionNumber":"4/2009","sectionType":"part","heading":"4/2009","content":"## 4/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2100},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument serves its specific purpose of cancelling a superseded airworthiness directive. It does not expand regulatory scope beyond the original intent of removing an obsolete requirement."},"complexity_factors":["Single operative provision (cancellation of previous directive)","No defined terms or interpretation section","No conditional logic, exceptions, or procedural steps","Background reference to manufacturer service bulletin for context only"],"plain_english_summary":"This document cancels a previous aviation safety rule that required inspection of the powerplant firewall on Piper PA-42 (Cheyenne III) aircraft.\n\n**Who it affects:**\n- Owners and operators of Piper PA-42 (Cheyenne III) series aeroplanes\n- Maintenance organisations servicing these aircraft\n\n**What it does:**\n- Removes the mandatory requirement to inspect for unplugged holes in the firewall\n- Cancels the previous Airworthiness Directive that mandated this check in accordance with manufacturer Service Bulletin No. 727\n\n**Why it matters:**\nOperators are no longer legally required to perform this specific inspection, reducing maintenance obligations for this aircraft type. The cancellation reflects that the safety issue is no longer considered a current risk requiring regulatory intervention."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-1-powerplant-firewall-inspection-cancelled","history":"/api/acts/ad-pa-42-1-powerplant-firewall-inspection-cancelled/history","analysis":"/api/acts/ad-pa-42-1-powerplant-firewall-inspection-cancelled/analysis","conflicts":"/api/acts/ad-pa-42-1-powerplant-firewall-inspection-cancelled/conflicts","importantCases":"/api/acts/ad-pa-42-1-powerplant-firewall-inspection-cancelled/important-cases","documents":"/api/acts/ad-pa-42-1-powerplant-firewall-inspection-cancelled/documents"}}