{"id":"F2006B06375","name":"AD/PT6T/5 - P3 Air Filter","slug":"ad-pt6t-5-p3-air-filter","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47642,"registerId":"commonwealth-F2006B06375-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PT6T/5 - P3 Air Filter","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Pratt and Whitney Canada Turbine Engines - PT6T Series\n\n \n\nAD/PT6T/5 P3 Air Filter 10/85\n\nApplicability: PT6T-3, -3B, -6 and ST6T-75, -76 with S/Nos. as per SB No. 5206, Rev. 3. Document:               1. Pratt & Whitney Aircraft of Canada SB No. 5124, Rev. 5; and\n\n2.    Pratt & Whitney Aircraft of Canada SB No. 5180, Rev. 2; or\n\n \n\n3.    Pratt & Whitney Aircraft of Canada SB No. 5206, Rev. 3; or\n\n \n\n4.    AD/UAC-T/33 Amdt 3.\n\n \n\nNote: Canadian Airworthiness Directive No. CF-83-04 refers.\n\n \n\nCompliance: Not later than next overhaul.\n\n \n\nBackground: This Directive is amended in order to specify Service Bulletin No. 5206, Rev. 3 as an alternative means of compliance and to reference the Canadian Airworthiness Directive concerned.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical amendment to an existing Airworthiness Directive. The 'Background' section explicitly states the sole purpose: adding Service Bulletin 5206 Rev. 3 as an alternative compliance method and referencing the Canadian equivalent directive. The scope remains tightly focused on P3 air filter requirements for specific PT6T engines — it has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific technical requirement (P3 air filter installation/inspection)","Only 4 defined compliance paths, presented as simple alternatives ('or')","Clear applicability limited to specific engine models and serial numbers","Single deadline ('next overhaul') with no conditional exceptions","No nested definitions, cross-references to other legislation, or procedural sub-requirements","Document references are external technical standards (Service Bulletins) rather than legislative cross-references"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety instruction) issued by Australia's Civil Aviation Safety Authority for specific Pratt & Whitney Canada helicopter engines.\n\n**What it does:**\n- Requires owners and operators of certain PT6T-series turbine engines to install or inspect a **P3 air filter** — a component that prevents debris from damaging the engine's fuel control system.\n\n**Who it affects:**\n- Operators of helicopters using PT6T-3, PT6T-3B, PT6T-6, and ST6T-75/76 engines with specific serial numbers listed in Service Bulletin 5206, Revision 3.\n\n**What must be done:**\n- The work must be completed **no later than the engine's next overhaul** (the scheduled major maintenance when the engine is completely stripped down and rebuilt).\n\n**How to comply:**\nYou can follow any one of these four approved methods:\n- Service Bulletin 5124, Revision 5; **or**\n- Service Bulletin 5180, Revision 2; **or**  \n- Service Bulletin 5206, Revision 3; **or**\n- Airworthiness Directive AD/UAC-T/33 Amendment 3.\n\n**Why it matters:**\nWithout this filter, contaminants can enter the engine's pneumatic sensing system, potentially causing power loss or engine failure in flight. This directive was updated to add a newer service bulletin (5206 Rev. 3) as an alternative compliance path and to align with the equivalent Canadian safety directive (CF-83-04)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument was amended to add Service Bulletin No. 5206, Rev. 3 as an alternative means of compliance and to reference the Canadian Airworthiness Directive CF-83-04, thereby expanding and clarifying the approved compliance methods and cross‑references compared with the prior text."},"complexity_factors":["References multiple external compliance documents (P&W SB 5124 Rev 5; SB 5180 Rev 2; SB 5206 Rev 3; AD/UAC-T/33 Amdt 3) requiring cross-checking","Applicability tied to specific engine models and serial numbers 'as per SB No. 5206, Rev. 3' — need to verify serial-number lists","Compliance timing set to 'Not later than next overhaul' — introduces scheduling and maintenance-planning considerations","Explicit cross-reference to a foreign airworthiness directive (Canadian AD CF-83-04) — creates cross-jurisdictional linkage","Amendment introduces an alternative means of compliance (SB 5206 Rev 3) — operators may choose among approved methods"],"plain_english_summary":"This airworthiness directive requires operators of specified Pratt & Whitney PT6T and ST6T turbine engines (serial numbers as listed in Service Bulletin 5206 Rev 3) to have the P3 air filter dealt with by the next engine overhaul. It accepts several Pratt & Whitney service bulletins or a listed amendment as compliant methods; owners/operators must arrange and pay for the work under the Civil Aviation Safety Authority requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6t-5-p3-air-filter","history":"/api/acts/ad-pt6t-5-p3-air-filter/history","analysis":"/api/acts/ad-pt6t-5-p3-air-filter/analysis","conflicts":"/api/acts/ad-pt6t-5-p3-air-filter/conflicts","importantCases":"/api/acts/ad-pt6t-5-p3-air-filter/important-cases","documents":"/api/acts/ad-pt6t-5-p3-air-filter/documents"}}