{"id":"F2008L02647","name":"AD/PA-31/38 - Heater Solenoid Shut-Off Valve - Modification - CANCELLED","slug":"ad-pa-31-38-heater-solenoid-shut-off-valve-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74684,"registerId":"commonwealth-F2008L02647-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-31 Series Aeroplanes","sectionType":"division","heading":"Piper PA-31 Series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-31/38 | Heater Solenoid Shut-Off Valve - 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 modification of the heater solenoid shut-off valve. The AD required compliance within 100 hours TIS after December 1975. The AD was not based on a Piper service instruction. 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-31/38","sectionType":"part","heading":"AD/PA-31/38","content":"## AD/PA-31/38","sortOrder":1},{"sectionNumber":"Heater Solenoid Shut-Off Valve - Modific","sectionType":"part","heading":"Heater Solenoid Shut-Off Valve - Modification","content":"## Heater Solenoid Shut-Off Valve - 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":1967},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the Airworthiness Directive after its original safety objective was achieved (all affected aircraft modified). This represents the intended conclusion of the regulatory scheme, not an expansion of scope."},"complexity_factors":["Single operative provision cancelling the previous directive","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references","Straightforward historical background only"],"plain_english_summary":"This document officially **cancels** a former safety rule (called an Airworthiness Directive or AD) that applied to specific Piper aircraft models (the PA-31 series).\n\n**What the rule originally required**\nBetween 1975 and 2008, owners of these aircraft had to complete a one-time modification to the heater solenoid shut-off valve—a component that controls fuel flow to the cabin heater. Operators had to carry out this fix within 100 hours of flying time after December 1975.\n\n**Why it was cancelled**\nThe Civil Aviation Safety Authority terminated this requirement on **31 July 2008** because every affected aircraft had already undergone the required modification. The rule had achieved its safety purpose and was no longer needed.\n\n**Who this affects**\nOwners and operators of Piper PA-31 series aeroplanes. Since the directive is now cancelled, no further action is required regarding this specific heater valve modification."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-38-heater-solenoid-shut-off-valve-modification-cancelled","history":"/api/acts/ad-pa-31-38-heater-solenoid-shut-off-valve-modification-cancelled/history","analysis":"/api/acts/ad-pa-31-38-heater-solenoid-shut-off-valve-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-31-38-heater-solenoid-shut-off-valve-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-31-38-heater-solenoid-shut-off-valve-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-31-38-heater-solenoid-shut-off-valve-modification-cancelled/documents"}}