{"id":"F2006B05789","name":"AD/PA-31/83 Amdt 1 - Oil And Manifold Pressure Tubes - Inspection","slug":"ad-pa-31-83-amdt-1-oil-and-manifold-pressure-tubes-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135686,"registerId":"commonwealth-F2006B05789-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/83 Amdt 1 - Oil And Manifold Pressure Tubes - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Piper PA-31 Series Aeroplanes\n\n \n\nAD/PA-31/83\n\nAmdt 1\n\n\nOil And Manifold Pressure Tubes - Inspection 3/81\n\n \n\nApplicability: Models PA-31 and PA-31-325 with S/Nos. 31-752 to 31-8112002. PA-31-350 with S/Nos 31-5001 to 31-8052212 with air conditioning installed.\n\n \n\nNote: Compliance with the previous issue of this Directive satisfies compliance with this revised issue.\n\n \n\nDocument: Piper SB No. 643A.\n\n \n\nCompliance: Within 100 hours time in service after 31 March 1981.\n\n \n\nBackground: This Directive has been raised in issue to include the extended S/No. range of aircraft listed in Piper SB No. 643A.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2090},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment expands the original directive's coverage to include additional aircraft serial number ranges as specified in Piper Service Bulletin 643A, extending the safety requirement to more PA-31 aircraft than the original issue."},"complexity_factors":["Single, specific compliance requirement with no exceptions or conditional logic","Short document with minimal cross-referencing (only to Piper Service Bulletin 643A)","Clear applicability criteria limited to specific aircraft models and serial number ranges"],"plain_english_summary":"This is a **safety order** (legally called an Airworthiness Directive) that mandates an inspection of critical engine hoses on specific Piper aircraft.\n\n**Who it affects**\nOwners and operators of Piper PA-31, PA-31-325, and PA-31-350 aircraft with specific serial numbers (particularly those with air conditioning installed).\n\n**What it requires**\nThe oil and manifold pressure tubes — hoses that carry oil and engine pressure readings to cockpit instruments — must be inspected within 100 **flight hours** (hours the aircraft is operating) after 31 March 1981. The inspection must follow the procedures in Piper Service Bulletin 643A.\n\n**Why it matters**\nFaulty tubes can cause engine damage or misleading instrument readings, creating serious flight safety risks. This updated version expands the original order to cover additional aircraft identified by extended serial number ranges."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-83-amdt-1-oil-and-manifold-pressure-tubes-inspection","history":"/api/acts/ad-pa-31-83-amdt-1-oil-and-manifold-pressure-tubes-inspection/history","analysis":"/api/acts/ad-pa-31-83-amdt-1-oil-and-manifold-pressure-tubes-inspection/analysis","conflicts":"/api/acts/ad-pa-31-83-amdt-1-oil-and-manifold-pressure-tubes-inspection/conflicts","importantCases":"/api/acts/ad-pa-31-83-amdt-1-oil-and-manifold-pressure-tubes-inspection/important-cases","documents":"/api/acts/ad-pa-31-83-amdt-1-oil-and-manifold-pressure-tubes-inspection/documents"}}