{"id":"F2006B08219","name":"AD/CESSNA 336/10 - Wing Front Carry Thru Spar Inspection and Modification","slug":"ad-cessna-336-10-wing-front-carry-thru-spar-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115455,"registerId":"commonwealth-F2006B08219-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 336/10 - Wing Front Carry Thru Spar Inspection and Modification","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)  Cessna 336 Series Aeroplanes\n\n \n\nAD/CESSNA 336/10 Wing Front Carry Thru Spar\n\nInspection and Modification\n\n\n5/74\n\n \n\nApplicability: All models with S/Nos. 336-0001 to 336-0195 not modified in accordance with Service Kit SK 336-19A.\n\n \n\nDocument: Cessna SL ME74-4.\n\n \n\nCompliance: For aircraft with more than 2975 hours total time in service as at 14 May 1974 - within 25 hours time in service after 14 May 1974, and thereafter at intervals not exceeding 100 hours time in service.\n\n \n\nFor all other aircraft - before exceeding 3000 hours total time in service and thereafter 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific structural safety issue in a limited aircraft population. The scope remains precisely focused on the original safety concern without expansion into unrelated operational or maintenance areas."},"complexity_factors":["Single, specific applicability criterion (serial number range plus exclusion for already-modified aircraft)","Straightforward two-tier compliance schedule based on flight hours threshold","No defined terms section or complex cross-referencing","Single referenced document (Cessna Service Letter ME74-4)","Minimal conditional logic (only two compliance paths based on hours-in-service threshold)","Short document length (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates safety inspections and modifications for specific Cessna 336 series aircraft.\n\n**What it does:**\n- Requires owners/operators to inspect and modify the **wing front carry thru spar** — a critical structural component that helps connect the wings to the fuselage and bears significant flight loads.\n- The directive applies to Cessna 336 aircraft with serial numbers 336-0001 through 336-0195 that haven't already been modified using Service Kit SK 336-19A.\n\n**Who it affects:**\n- Owners and operators of early-model Cessna 336 Skymaster aircraft (twin-engine push-pull configuration) built within that serial number range.\n\n**Compliance requirements:**\n- **High-time aircraft** (more than 2,975 flight hours as of 14 May 1974): Must complete the inspection within 25 flight hours after that date, then repeat every 100 flight hours.\n- **Lower-time aircraft** (all others): Must complete the inspection before reaching 3,000 total flight hours, then repeat every 100 flight hours.\n\n**Why it matters:**\nStructural failures in carry thru spars can be catastrophic. This AD addresses a known safety issue identified by the manufacturer (Cessna Service Letter ME74-4) to prevent potential wing separation or structural failure during flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive, as presented, applies only to Cessna 336 aircraft serial numbers 336-0001 through 336-0195 that have not been modified by Service Kit SK 336-19A and prescribes specific timing and recurring inspection intervals. The text gives no indication that the scope has been expanded or narrowed beyond that stated applicability; therefore there is no evidentiary basis in this text to conclude the scope has changed from an earlier or original instrument."},"complexity_factors":["Limited and concrete applicability by serial number range and by whether Service Kit SK 336-19A has been installed (Applicability).","Conditional compliance timing based on hours-in-service at a fixed historical date (14 May 1974), producing two separate initial-deadline rules (Compliance).","Recurring inspection interval fixed at 100 hours time in service (Compliance).","Dependence on external technical documents (Cessna SL ME74-4 and Service Kit SK 336-19A) for the method of inspection/modification (Document; Applicability).","Administrative requirement to track total time in service precisely to determine compliance windows (Compliance)."],"plain_english_summary":"This airworthiness directive mandates inspection and modification of the wing front carry‑thru spar on Cessna 336 serials 336‑0001 through 336‑0195 (unless already modified per Service Kit SK 336‑19A), with initial deadlines tied to total time‑in‑service and recurring 100‑hour intervals. \n\nOwners/operators must fund and schedule the work; the Civil Aviation Safety Authority enforces compliance. Adopting the service kit removes the recurring inspection obligation, concentrating costs into a one‑off modification."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-336-10-wing-front-carry-thru-spar-inspection-and-modification","history":"/api/acts/ad-cessna-336-10-wing-front-carry-thru-spar-inspection-and-modification/history","analysis":"/api/acts/ad-cessna-336-10-wing-front-carry-thru-spar-inspection-and-modification/analysis","conflicts":"/api/acts/ad-cessna-336-10-wing-front-carry-thru-spar-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-cessna-336-10-wing-front-carry-thru-spar-inspection-and-modification/important-cases","documents":"/api/acts/ad-cessna-336-10-wing-front-carry-thru-spar-inspection-and-modification/documents"}}