{"id":"F2009L00948","name":"AD/PA-46/12 Amdt 1 - Alternate Air Control Linkage","slug":"ad-pa-46-12-amdt-1-alternate-air-control-linkage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78438,"registerId":"commonwealth-F2009L00948-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-46 (Malibu) Series Aeroplanes","sectionType":"division","heading":"Piper PA-46 (Malibu) Series Aeroplanes","content":"### Piper PA-46 (Malibu) Series Aeroplanes\n\n| AD/PA-46/12 Amdt 1 | Alternate Air Control Linkage | 4/2009 |\n| ------------------ | ----------------------------- | ------ |\n\n| Applicability: | Model PA-46-310P with serial numbers 46-8408001 to 46-8608067, and 4608001 to 4608025.                                                                                                                                                                                                                                                       |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Determine whether or not the alternate air valve linkage Piper Part No. 765-198 has been installed on the left side of the engine air box. If the alternate air valve linkage is not installed, install the Alternate Air Valve Modification Kit offered in Piper Service Letter No. 985, Part II.                                        |\n|                | 2. Immediately after installation of the alternate air valve linkage Piper PartNo. 765-198, adjust and check the operation of the alternate air control in accordance with Piper Service Bulletin No. 852.Note: USA AD 87-04-01 (Amdt 39-5558) refers.                                                                                       |\n| Compliance:    | Within 100 hours time in service after the date of effectivity of this Amendment.                                                                                                                                                                                                                                                            |\n|                | Compliance with the original issue of this AD constitutes compliance with this amendment.                                                                                                                                                                                                                                                    |\n|                | This Amendment becomes effective on 9 April 2009.                                                                                                                                                                                                                                                                                            |\n| Background:    | The original issue of this AD in 1986 applied only to PA-46 aircraft which had the alternate air valve linkage installed in accordance with Piper Service BulletinNo. 985, Part II.This Amendment matches USA AD 87-04-01 by applying to PA-46-310P by serial number and mandating installation of the Alternate Air Valve Modification Kit. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n12 February 2009","sortOrder":0},{"sectionNumber":"AD/PA-46/12 Amdt 1","sectionType":"part","heading":"AD/PA-46/12 Amdt 1","content":"## AD/PA-46/12 Amdt 1","sortOrder":1},{"sectionNumber":"Alternate Air Control Linkage","sectionType":"part","heading":"Alternate Air Control Linkage","content":"## Alternate Air Control Linkage","sortOrder":2},{"sectionNumber":"4/2009","sectionType":"part","heading":"4/2009","content":"## 4/2009","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment expands scope relative to the original 1986 AD by mandating installation of the alternate air valve linkage for a defined set of PA-46-310P serial numbers rather than applying only where the linkage had previously been installed. It aligns the domestic requirement with USA AD 87-04-01 and creates a new retrofit obligation with a 100-hour compliance window; owners/operators bear the cost and scheduling burden."},"complexity_factors":["Targeted serial-number applicability (serials 46-8408001–46-8608067 and 4608001–4608025) — narrows and complicates identification of affected aircraft.","Hardware-specific requirement to identify and/or install Alternate Air Valve linkage (Piper Part No. 765-198) — requires parts procurement and physical retrofit.","Dependence on external non‑legislative documents: Piper Service Letter No. 985 Part II (installation kit) and Service Bulletin No. 852 (adjustment/check) — compliance requires following manufacturer's procedures.","Post-installation adjustment and operation check required — imposes skilled maintenance labour and inspection steps.","Fixed compliance window of 'within 100 hours time in service' — creates scheduling and operational impact for owners/operators.","Cross-reference to earlier ADs (original 1986 AD and USA AD 87-04-01) — introduces interaction with prior compliance determinations.","Provision that compliance with the original AD constitutes compliance with this amendment — potential for overlap or uncertainty in record-keeping."],"plain_english_summary":"This amendment requires owners/operators of specific Piper PA-46-310P aeroplanes (serial numbers 46-8408001–46-8608067 and 4608001–4608025) to check for an alternate air valve linkage (Piper P/N 765-198) on the left side of the engine air box and, if it is missing, install the kit in Piper Service Letter No. 985 Part II and then adjust/check the control per Service Bulletin No. 852. The instrument says this is to ensure correct alternate-air control operation; compliance is required within 100 hours time-in-service."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original 1986 AD only applied to aircraft that already had the alternate air valve linkage installed. This 2009 amendment significantly expands scope to cover ALL affected PA-46-310P aircraft by serial number, mandating installation of the modification kit where previously absent. This transforms the directive from a maintenance/inspection requirement for equipped aircraft into an installation mandate for the entire affected fleet."},"complexity_factors":["Single, clearly defined applicability (specific aircraft model and serial numbers)","Two straightforward requirements with clear conditional logic (check if installed; install if missing)","Minimal cross-referencing (only to Piper Service Letter 985, Service Bulletin 852, and US AD 87-04-01)","Simple compliance timeline (100 hours time in service)","No nested exceptions or complex defined terms","Short document (approximately 200 words of substantive content)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of certain Piper PA‑46‑310P serials to inspect for the alternate air valve linkage (Part 765‑198) on the left engine airbox, install Piper’s modification kit if it’s missing, and adjust/test the alternate air control per the service bulletin. Compliance is mandatory within 100 flight hours of 9 April 2009. It closes a safety gap: without the linkage the backup air system can fail, risking engine failure in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-46-12-amdt-1-alternate-air-control-linkage","history":"/api/acts/ad-pa-46-12-amdt-1-alternate-air-control-linkage/history","analysis":"/api/acts/ad-pa-46-12-amdt-1-alternate-air-control-linkage/analysis","conflicts":"/api/acts/ad-pa-46-12-amdt-1-alternate-air-control-linkage/conflicts","importantCases":"/api/acts/ad-pa-46-12-amdt-1-alternate-air-control-linkage/important-cases","documents":"/api/acts/ad-pa-46-12-amdt-1-alternate-air-control-linkage/documents"}}