{"id":"F2006B06018","name":"AD/PA-46/11 - De-Ice Pressure Control Valve","slug":"ad-pa-46-11-de-ice-pressure-control-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114416,"registerId":"commonwealth-F2006B06018-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-46/11 - De-Ice Pressure Control Valve","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPiper PA-46 (Malibu) Series Aeroplanes\n\nAD/PA-46/11 De-Ice Pressure Control Valve 6/86 DM\n\nApplicability: 1. All model S/Nos 46-8408001 to 46-8508018\n\n2. All model S/Nos 46-8408001 to 46-8508018 fitted with Hose kit Part No 765-159 and S/Nos 46-8508019 to 46-8508029.\n\nRequirement: Action in accordance with Piper Service Bulletin No 803A.\n\nCompliance: 1. Prior to the next flight into icing conditions, after 16 May 1986 and thereafter every 25 hours until kit, Piper Part No 765-159V, is installed.\n\n2. Within 25 hours time in service after 16 May 1986 and thereafter every 50 hours until the Pressure Control Valve Piper Part No 84523-4 is replaced by Part No 845423-805.\n\nBackground: BF Goodrich, manufacturer of the pneumatic de-ice components used in the Malibu, have advised that a sticking condition will occur to the Pressure Control Valve due to carbon residue from the vacuum pump mixed with a waxy substance which is extracted from the hoses in the system.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2103},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope addressing the specific mechanical defect in the de-icing pressure control valve identified by the manufacturer. It has not expanded beyond the original safety issue."},"complexity_factors":["Two distinct applicability categories based on aircraft serial number ranges and installed equipment","Dual compliance schedules with different recurring inspection intervals (25-hour vs 50-hour)","Cross-reference to external technical standard (Piper Service Bulletin 803A) not reproduced in the directive","Technical aviation terminology requiring specialized maintenance knowledge (e.g., 'time in service', part numbers)"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners of certain Piper PA-46 Malibus to follow Piper Service Bulletin No. 803A to prevent the de-ice pressure control valve from sticking and disabling the de-ice system. It affects PA-46 aircraft in the listed serial-number ranges and those with specific hose kits.\n\nComplying—through the bulletin’s inspections and parts replacement—prevents in-flight loss of de-ice capability, a critical safety hazard in icing conditions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-46-11-de-ice-pressure-control-valve","history":"/api/acts/ad-pa-46-11-de-ice-pressure-control-valve/history","analysis":"/api/acts/ad-pa-46-11-de-ice-pressure-control-valve/analysis","conflicts":"/api/acts/ad-pa-46-11-de-ice-pressure-control-valve/conflicts","importantCases":"/api/acts/ad-pa-46-11-de-ice-pressure-control-valve/important-cases","documents":"/api/acts/ad-pa-46-11-de-ice-pressure-control-valve/documents"}}