{"id":"F2008L01839","name":"AD/PA-22/17 - Cabin Heater Box Plate - Modification - CANCELLED","slug":"ad-pa-22-17-cabin-heater-box-plate-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74029,"registerId":"commonwealth-F2008L01839-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-22 (Tri-Pacer and Colt) Series ","sectionType":"division","heading":"Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes","content":"### Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes\n\n| AD/PA-22/17 | Cabin Heater Box Plate - Modification | 7/2008 |\n| ----------- | ------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                           |\n| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 3 July 2008.                                                                                                                                                                                                                                 |\n| Background:  | This Directive specified once-only modification of a cabin heater box plate in 1961 in accordance with Piper SB No. 203. This Directive was not based on a USA Directive. As all affected aircraft would have been modified long ago, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 May 2008","sortOrder":0},{"sectionNumber":"AD/PA-22/17","sectionType":"part","heading":"AD/PA-22/17","content":"## AD/PA-22/17","sortOrder":1},{"sectionNumber":"Cabin Heater Box Plate - Modification","sectionType":"part","heading":"Cabin Heater Box Plate - Modification","content":"## Cabin Heater Box Plate - Modification","sortOrder":2},{"sectionNumber":"7/2008","sectionType":"part","heading":"7/2008","content":"## 7/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1525},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument does not expand or alter the scope of the original legislation; it repeals Airworthiness Directive AD/PA-22/17 in its entirety. The effect is to remove all obligations imposed by the original directive due to obsolescence."},"complexity_factors":["Single operative provision (cancellation of previous instrument)","No defined terms or interpretation section","No cross-references to other legislation","No conditional logic, exceptions, or procedural steps","Document contains under 100 words of substantive legal text"],"plain_english_summary":"**What this does:** This document cancels an old aviation safety rule (called an Airworthiness Directive or AD) that previously required owners of specific light aircraft to modify a cabin heater component.\n\n**Who it affects:** Owners and operators of Piper PA-22 Tri-Pacer and Colt series aeroplanes—specifically those manufactured in 1961 that had not already undergone the modification.\n\n**What changed:** The original rule required a one-time modification to the cabin heater box plate (following Piper Service Bulletin No. 203). **As of 3 July 2008, this requirement is completely removed.** Aircraft owners no longer need to comply with this directive.\n\n**Why it matters:** The safety modification only applied to aircraft built in 1961. By 2008, aviation safety authorities determined that every affected plane would have been modified decades ago, making the rule redundant. This cancellation eliminates an unnecessary compliance burden while maintaining safety standards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-17-cabin-heater-box-plate-modification-cancelled","history":"/api/acts/ad-pa-22-17-cabin-heater-box-plate-modification-cancelled/history","analysis":"/api/acts/ad-pa-22-17-cabin-heater-box-plate-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-22-17-cabin-heater-box-plate-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-22-17-cabin-heater-box-plate-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-22-17-cabin-heater-box-plate-modification-cancelled/documents"}}