{"id":"F2006B07204","name":"AD/SWSA226/62 - Propeller Blade Separation","slug":"ad-swsa226-62-propeller-blade-separation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48937,"registerId":"commonwealth-F2006B07204-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SWSA226/62 - Propeller Blade Separation","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nFairchild (Swearingen) SA226 and SA227 Series Aeroplanes\n\nAD/SWSA226/62 Propeller Blade Separation 9/91\n\nApplicability: Hartzell model HC-B3TN-5C ( )/T10282 installed on Swearingen SA226-TC or SA226-AT aircraft, with Garrett TPE 331-1OUA engines, which have been modified by Airesearch Aviation Company STC SA344GL or either Par Air or Superior Aircraft Inc STC SA 4872SW.\n\nRequirement: Action in accordance with Hartzell Service Bulletin No 161A.\n\nNote 1: FAA AD 86-05-12 and 88-24-15 refer.\n\nNote 2: Propellers fitted with T10282N blades are exempt from the requirements of this directive.\n\nCompliance: Prior to issue of a Certificate of Airworthiness or upon incorporation of Airesearch Aviation Company STC SA 344GL-D or Par Air or Superior Aircraft Inc STC SA 4872SW. Re-inspect at intervals not exceeding 500 hours time in service.\n\nBefore installation on an aircraft unless previously accomplished within the preceding 500 hours time in service.\n\nBackground: Due to increased torque of which the subject engines are capable, the significance of scratches, scrapes, tool marks and/or corrosion pits in the pilot tube bore area is increased to the degree that fatigue failure causing blade separation is possible. The repetitive inspection now required on all S/No blades is now not required for a specific P/N blade due to its improved design characteristics.\n\nThis Directive is raised to incorporate the propeller inspection in the aircraft series.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The directive expands mandatory propeller inspection obligations within the aircraft series by incorporating a repetitive inspection regime (500‑hour intervals) and linking compliance to Certificate of Airworthiness or STC incorporation. It narrows hardware coverage by exempting blades of P/N T10282N and ties the measure specifically to aircraft modified by named STCs, thereby changing which aircraft/blades must be inspected (Requirement; Compliance; Note 2; Background)."},"complexity_factors":["Narrow, technical applicability: specific aircraft models, propeller model/part numbers and particular STCs must be identified to determine coverage (Applicability).","Reliance on external technical document for mandated action: compliance requires following Hartzell Service Bulletin No. 161A (Requirement).","Conditional compliance triggers: timing tied to Certificate of Airworthiness issuance, incorporation of specified STCs, and installation timing if prior inspection within 500 hours isn’t met (Compliance).","Recurring inspection obligation with a defined interval (every 500 hours time in service) creates an ongoing compliance burden (Compliance).","Part‑number exemption: a specific blade P/N (T10282N) is explicitly exempted, requiring operators to differentiate blades by P/N (Note 2; Background).","Cross‑referenced regulatory material: FAA ADs are noted as related guidance, increasing interpretive context (Note 1).","Technical judgment in inspection criteria: inspections must detect scratches, scrapes, tool marks or corrosion pits that could cause fatigue—requires maintenance skill and recordkeeping (Background).","Multiple STC holders named (Airesearch, Par Air, Superior Aircraft) adds administrative complexity for fleet managers tracking modifications (Applicability; Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of Swearingen SA226‑TC/AT aeroplanes fitted with Hartzell HC‑B3TN‑5C (T10282) propellers and certain STC‑modified Garrett TPE331 engines to carry out inspections in accordance with Hartzell Service Bulletin No. 161A. Inspections must be done before Certificate of Airworthiness issue or STC incorporation, before installation if not done within the prior 500 hours, and repeated at intervals not exceeding 500 hours. Blades marked T10282N are exempt. The measure responds to increased engine torque raising the risk that scratches, marks or corrosion can cause fatigue and blade separation."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD remains tightly scoped to its original purpose: addressing a specific fatigue failure risk in particular propeller blades on modified Swearingen aircraft. The scope has not expanded beyond this narrow safety issue."},"complexity_factors":["Single, specific technical requirement (follow Hartzell Service Bulletin 161A)","Limited applicability — only 2 aircraft models, 1 propeller model, 3 specific STC modifications, and 1 engine type","One clear exemption (T10282N blades)","Straightforward compliance timeline (before airworthiness certificate issued, then every 500 hours)","No nested definitions, cross-references to other legislation, or conditional sub-clauses","Background explanation provided in plain language"],"plain_english_summary":"CASA's AD mandates inspections of Hartzell HC-B3TN-5C propellers with T10282 blades on Swearingen SA226-TC/SA226-AT aircraft modified by specified STCs, requiring inspection per Hartzell SB 161A before return to service and every 500 flight hours (T10282N blades exempt).  \n\nIt responds to higher-torque Garrett TPE331-10UA installations where pilot-tube bore damage can cause blade fatigue and in‑flight failure, so operators must ensure inspections (and that recently installed propellers were inspected within 500 hours) to maintain airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-swsa226-62-propeller-blade-separation","history":"/api/acts/ad-swsa226-62-propeller-blade-separation/history","analysis":"/api/acts/ad-swsa226-62-propeller-blade-separation/analysis","conflicts":"/api/acts/ad-swsa226-62-propeller-blade-separation/conflicts","importantCases":"/api/acts/ad-swsa226-62-propeller-blade-separation/important-cases","documents":"/api/acts/ad-swsa226-62-propeller-blade-separation/documents"}}