{"id":"F2006B06177","name":"AD/PFP/2 Amdt 1 - Sensenich Propellers - Hub Inspection","slug":"ad-pfp-2-amdt-1-sensenich-propellers-hub-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47023,"registerId":"commonwealth-F2006B06177-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PFP/2 Amdt 1 - Sensenich Propellers - Hub 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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propellers - Fixed Pitch\n\n \n\nAD/PFP/2\n\nAmdt 1\n\n\nSensenich Propellers - Hub Inspection NK\n\n \n\nApplicability: All model M74DM installed on Lycoming 0-320-B series engines except propellers with an \"A\" or \"K\" S/No. prefix and all Model M74DM regardless of S/No. prefix, installed on all Lycoming 0-320 series engines when used in agricultural operations.\n\n \n\nDocument: Sensenich SB No. R-8.\n\n \n\nCompliance: At intervals not exceeding 100 hours time in service.\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\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 standard, narrow Airworthiness Directive targeting a specific propeller model and engine combination. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single operative requirement (hub inspection at 100-hour intervals)","Two-part applicability clause with one explicit exception (\"A\" or \"K\" serial number prefix)","No defined terms section — uses standard aviation terminology","No cross-references to other legislation beyond parent Civil Aviation Regulations 1998","Single external document reference (Sensenich SB No. R-8)","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of certain aircraft propellers to perform regular safety inspections.\n\n**What it does:**\n- Mandates inspection of **Sensenich M74DM propellers** installed on specific Lycoming aircraft engines\n- Requires checking the propeller hub for defects or damage\n- Inspections must happen **every 100 hours of flight time** (\"time in service\")\n\n**Who it affects:**\n- Owners/operators of aircraft with:\n  - **M74DM propellers** on **Lycoming O-320-B engines** — **except** those with serial numbers starting with \"A\" or \"K\"\n  - **Any M74DM propeller** (regardless of serial number) on **any Lycoming O-320 engine** when used for **agricultural flying** (crop dusting, aerial application)\n\n**Why it matters:**\nPropeller hub failures can cause catastrophic accidents. This directive prevents that by forcing regular checks based on manufacturer service bulletin R-8. Agricultural operations get extra scrutiny because low-altitude, high-stress flying increases wear on equipment.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A legally enforceable safety order — compliance is mandatory\n- **Time in service:** Actual operating hours, not calendar time\n- **SB (Service Bulletin):** Manufacturer's technical notice recommending maintenance actions"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The amendment extends applicability in one respect: while the instrument continues to cover model M74DM propellers installed on Lycoming 0-320-B series engines (with an \\\"A\\\" or \\\"K\\\" serial-number exception), it explicitly adds coverage of all model M74DM propellers (regardless of serial-number prefix) when installed on any Lycoming 0-320 series engines and used in agricultural operations. The compliance interval (100 hours TIS) and the required document (Sensenich SB No. R-8) remain specified. (See “Applicability”, “Document”, and “Compliance”.)"},"complexity_factors":["Narrow technical scope: only Sensenich model M74DM propellers on specified Lycoming 0-320 series engines (with limited serial-number exceptions). (See “Applicability”.)","Different applicability rule for agricultural operations: removes serial-number exception for that use, adding a second branch to the applicability test. (See “Applicability”.)","Dependency on an external document for the inspection procedure: Sensenich SB No. R-8 must be consulted and followed. (See “Document”.)","Recurring scheduling requirement: fixed inspection interval (every 100 hours TIS) imposes ongoing compliance planning. (See “Compliance”.)","Regulatory authority linkage: instrument is an AD under CAR Part 39, which carries mandatory compliance obligations and enforcement mechanisms. (See header)"],"plain_english_summary":"This instrument mandates recurring inspections of Sensenich fixed‑pitch M74DM propeller hubs per Sensenich Service Bulletin No. R‑8 at intervals not exceeding 100 hours TIS, covering M74DMs on Lycoming 0‑320‑B series engines (except S/No. prefixes “A” or “K”) and all M74DMs on Lycoming 0‑320 series aircraft used in agricultural operations.  \n\nIt affects owners/operators who must schedule and pay for inspections/repairs; it’s an airworthiness directive issued under CASA (Part 39)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pfp-2-amdt-1-sensenich-propellers-hub-inspection","history":"/api/acts/ad-pfp-2-amdt-1-sensenich-propellers-hub-inspection/history","analysis":"/api/acts/ad-pfp-2-amdt-1-sensenich-propellers-hub-inspection/analysis","conflicts":"/api/acts/ad-pfp-2-amdt-1-sensenich-propellers-hub-inspection/conflicts","importantCases":"/api/acts/ad-pfp-2-amdt-1-sensenich-propellers-hub-inspection/important-cases","documents":"/api/acts/ad-pfp-2-amdt-1-sensenich-propellers-hub-inspection/documents"}}