{"id":"F2008L02638","name":"AD/PA-31/81 - Heater Fuel Drain Hose - Modification - CANCELLED","slug":"ad-pa-31-81-heater-fuel-drain-hose-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74674,"registerId":"commonwealth-F2008L02638-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-31 Series Aeroplanes","sectionType":"division","heading":"Piper PA-31 Series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-31/81 | Heater Fuel Drain Hose - 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 fuel drain hose in accordance with Piper SB No. 641. The AD required compliance within 100 hours TIS after July 1979. 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-31/81","sectionType":"part","heading":"AD/PA-31/81","content":"## AD/PA-31/81","sortOrder":1},{"sectionNumber":"Heater Fuel Drain Hose - Modification","sectionType":"part","heading":"Heater Fuel Drain Hose - Modification","content":"## Heater Fuel Drain Hose - 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":1385},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The scope remains exactly as originally intended—specific to the heater fuel drain hose modification for Piper PA-31 series aircraft. The cancellation terminates the requirement but does not expand, restrict, or alter the original scope."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretation section","No cross-references to other legislative provisions","No conditional logic or exceptions","Extremely short (approximately 100 words of substantive content)"],"plain_english_summary":"This document cancels a previous aircraft safety rule for **Piper PA-31 series aeroplanes** (twin-engine aircraft like the Navajo and Chieftain).\n\n**What the old rule required:**\nThe original directive (from 1979) required owners to modify the **heater fuel drain hose** — a component that drains excess fuel from the cabin heating system. Aircraft had to be modified according to Piper Service Bulletin No. 641 within 100 hours of flight time after July 1979.\n\n**What this document does:**\nIt officially **cancels** that requirement effective 31 July 2008. The rule is no longer needed because all affected aircraft have already been modified.\n\n**Who is affected:**\nOwners and operators of Piper PA-31 series aircraft. However, since the work has been completed across the fleet, this simply removes an obsolete requirement from the books."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-81-heater-fuel-drain-hose-modification-cancelled","history":"/api/acts/ad-pa-31-81-heater-fuel-drain-hose-modification-cancelled/history","analysis":"/api/acts/ad-pa-31-81-heater-fuel-drain-hose-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-31-81-heater-fuel-drain-hose-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-31-81-heater-fuel-drain-hose-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-31-81-heater-fuel-drain-hose-modification-cancelled/documents"}}