{"id":"F2008L02655","name":"AD/PA-31/12 - Engine Control System - Inspection and Modification - CANCELLED","slug":"ad-pa-31-12-engine-control-system-inspection-and-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74692,"registerId":"commonwealth-F2008L02655-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-31 Series Aeroplanes","sectionType":"division","heading":"Piper PA-31 Series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-31/12 | Engine Control System - Inspectionand 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 inspection and modification of the engine control system in accordance with Piper SL No. 548. The AD required compliance within 100 hours TIS after June 1970. All affected aircraft have now been modified. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n12 June 2008","sortOrder":0},{"sectionNumber":"AD/PA-31/12","sectionType":"part","heading":"AD/PA-31/12","content":"## AD/PA-31/12","sortOrder":1},{"sectionNumber":"Engine Control System - Inspectionand Mo","sectionType":"part","heading":"Engine Control System - Inspectionand Modification","content":"## Engine Control System - Inspection  \nand 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":2436},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the legal effect of the original Airworthiness Directive rather than expanding its scope. The original purpose was to mandate engine control system modifications; this document confirms that objective has been achieved nationwide and formally concludes the regulatory program."},"complexity_factors":["Single operative provision (cancellation of previous directive)","No defined terms or interpretation sections","No conditional logic, exceptions, or cross-references to other legislation","Historical background provided for context only"],"plain_english_summary":"**What this document does**\n\nThis officially cancels a previous aviation safety rule (**Airworthiness Directive AD/PA-31/12**) that applied to **Piper PA-31 series aircraft**.\n\n**Background**\nThe original rule required a one-time inspection and modification of the engine control system, to be completed within 100 hours of flight time after June 1970, following guidelines in Piper Service Letter No. 548.\n\n**Why it matters**\nBecause all affected aircraft have now been modified, the safety requirement is obsolete. This document removes the legal obligation, effective **31 July 2008**.\n\n**Who it affects**\nOwners and operators of Piper PA-31 series aeroplanes. Note: They have already complied with the original requirement, so this simply cleans up the rulebook."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-12-engine-control-system-inspection-and-modification-cancelled","history":"/api/acts/ad-pa-31-12-engine-control-system-inspection-and-modification-cancelled/history","analysis":"/api/acts/ad-pa-31-12-engine-control-system-inspection-and-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-31-12-engine-control-system-inspection-and-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-31-12-engine-control-system-inspection-and-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-31-12-engine-control-system-inspection-and-modification-cancelled/documents"}}