{"id":"F2008L02633","name":"AD/PA-31/103 - Heater Air Distribution Box Thermal Switch - CANCELLED","slug":"ad-pa-31-103-heater-air-distribution-box-thermal-switch-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74666,"registerId":"commonwealth-F2008L02633-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-31 Series Aeroplanes","sectionType":"division","heading":"Piper PA-31 Series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-31/103 | Heater Air Distribution Box Thermal Switch | 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 heater air distribution box in accordance with Piper SB No. 731. The AD required modification within 100 hours TIS after June 1982. All affected aircraft have now been modified. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n13 June 2008","sortOrder":0},{"sectionNumber":"AD/PA-31/103","sectionType":"part","heading":"AD/PA-31/103","content":"## AD/PA-31/103","sortOrder":1},{"sectionNumber":"Heater Air Distribution Box Thermal Swit","sectionType":"part","heading":"Heater Air Distribution Box Thermal Switch","content":"## Heater Air Distribution Box Thermal Switch","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":2560},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument serves its singular purpose to formally cancel the previous airworthiness directive once universal compliance was achieved. There has been no expansion or creep beyond this original intent."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretive sections","No conditional logic, exceptions, or cross-references to other legislation","Extremely short (under 150 words of substantive text)","Straightforward factual background with no legal tests"],"plain_english_summary":"**What this is:** This document officially cancels a previous aircraft safety rule (called an Airworthiness Directive, or AD) that applied to Piper PA-31 series aeroplanes.\n\n**What the old rule required:** The original directive (AD/PA-31/103) required owners to modify the heater air distribution box in their aircraft within 100 hours of flying time after June 1982, following the manufacturer's instructions (Piper Service Bulletin No. 731).\n\n**Why it is being cancelled:** All affected aircraft have now completed the required modification, so the safety rule is no longer needed. The cancellation takes effect on **31 July 2008**.\n\n**Who issued this:** James Coyne, acting as a delegate of the Civil Aviation Safety Authority (CASA)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-103-heater-air-distribution-box-thermal-switch-cancelled","history":"/api/acts/ad-pa-31-103-heater-air-distribution-box-thermal-switch-cancelled/history","analysis":"/api/acts/ad-pa-31-103-heater-air-distribution-box-thermal-switch-cancelled/analysis","conflicts":"/api/acts/ad-pa-31-103-heater-air-distribution-box-thermal-switch-cancelled/conflicts","importantCases":"/api/acts/ad-pa-31-103-heater-air-distribution-box-thermal-switch-cancelled/important-cases","documents":"/api/acts/ad-pa-31-103-heater-air-distribution-box-thermal-switch-cancelled/documents"}}