{"id":"F2006B06352","name":"AD/PSN/1 - Blade and Hub - Inspection","slug":"ad-psn-1-blade-and-hub-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47569,"registerId":"commonwealth-F2006B06352-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PSN/1 - Blade and Hub - Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPropellers \\- Variable Pitch \\- Sensenich Series\n\nAD/PSN/1 Blade and Hub \\- Inspection 8/84\n\nApplicability: All controllable and constant speed propeller Models C-2FM, CS-2FM, C-3FR4, CS- 3FR5 and CS-3FM4.\n\nRequirement: 1. Remove the propeller blades from the hub and carefully inspect the wood blade shank and split retaining groove in the blade ferrule for cracks, check and tighten the lag screws to 160 inch pounds.\n\n2. Magnetically inspect the ferrule and all ferrous parts of the hub. Special care should be given to the inspection for cracks originating in the hub ring groove; or\n\nSensenich SB No. 113, Rev. 1 and Rev. R9; or FAA AD 63-19-4.\n\nCompliance: Propellers installed on Lycoming 0-235-C or 0-290-D series or Franklin 6A4-165-B3 engines \\- At intervals not exceeding 100 hours time in service. Propellers installed on engines not listed above - At intervals not exceeding 300 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive with a narrow, specific scope (particular Sensenich propeller models). It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only 5 specific propeller models affected","Simple two-step inspection requirement with one alternative compliance path","Straightforward compliance schedule with only two categories based on engine type","No defined terms section, no cross-references to other legislation, no conditional exceptions"],"plain_english_summary":"This is a **safety directive for aircraft propellers** made by Sensenich. It requires owners and operators to regularly inspect specific propeller models for dangerous cracks that could cause failure.\n\n**What it covers:**\n- **Which propellers:** Specific Sensenich variable-pitch models (C-2FM, CS-2FM, C-3FR4, CS-3FR5, and CS-3FM4)\n- **What must be done:**\n  1. Remove the blades and check the wooden shank and metal ferrule (the metal sleeve around the blade base) for cracks\n  2. Tighten lag screws to a specific torque (160 inch-pounds)\n  3. Use magnetic inspection on all metal hub parts, especially around the hub ring groove where cracks often start\n\n**Alternative compliance:** You can follow the manufacturer's Service Bulletin No. 113 (Revision 1 or R9) or an equivalent FAA directive instead.\n\n**How often:**\n- **Every 100 flight hours** if the propeller is on certain Lycoming or Franklin engines (these put more stress on the propeller)\n- **Every 300 flight hours** for all other engine types\n\n**Why it matters:** Cracks in propeller blades or hubs can lead to catastrophic failure in flight. This directive prevents accidents by catching fatigue damage before it becomes dangerous."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope, as set out in the text provided, applies only to the listed Sensenich propeller models and prescribes inspection tasks and intervals tied to engine installation. There is no indication in the supplied text that the scope has been broadened or narrowed beyond those model and engine distinctions."},"complexity_factors":["Narrow applicability limited to five specific propeller models (Applicability)","Two distinct inspection actions: visual/mechanical (blade removal, crack check, torque) and magnetic inspection (Requirement 1 and 2)","Different compliance intervals depending on engine type (100 vs 300 hours) (Compliance)","Specific numeric torque requirement for lag screws (160 inch‑pounds) (Requirement 1)","Reference to external documents (Sensenich SB No. 113 Revs and FAA AD 63‑19‑4) creating alternative or supplementary compliance pathways (Requirement 2)"],"plain_english_summary":"This directive mandates recurring removal, visual and magnetic inspection of blades and ferrules and re‑torquing of lag screws on specified Sensenich propellers (C‑2FM, CS‑2FM, C‑3FR4, CS‑3FR5, CS‑3FM4). Inspection intervals are engine‑dependent (100 hours for certain Lycoming/Franklin engines, 300 hours otherwise).\n\nIt affects owners/operators and maintenance providers, who bear inspection and repair costs and must have magnetic‑inspection capability. The measure aims to detect cracks early and reduce propeller‑failure risk, but increases recurring maintenance, downtime, and service costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-psn-1-blade-and-hub-inspection","history":"/api/acts/ad-psn-1-blade-and-hub-inspection/history","analysis":"/api/acts/ad-psn-1-blade-and-hub-inspection/analysis","conflicts":"/api/acts/ad-psn-1-blade-and-hub-inspection/conflicts","importantCases":"/api/acts/ad-psn-1-blade-and-hub-inspection/important-cases","documents":"/api/acts/ad-psn-1-blade-and-hub-inspection/documents"}}