{"id":"F2006B07213","name":"AD/SWSA226/70 - Horizontal Stabiliser - Aft Spar Attach Fitting","slug":"ad-swsa226-70-horizontal-stabiliser-aft-spar-attach-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48982,"registerId":"commonwealth-F2006B07213-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SWSA226/70 - Horizontal Stabiliser - Aft Spar Attach Fitting","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/SWSA226/70 Horizontal Stabiliser \\- Aft Spar Attach Fitting 5/95\n\nApplicability: Models SA226-T, SA226-T(B), SA226-AT and SA226-TC listed in Fairchild Service Bulletin 226-55-010, Revised December 13 1991.\n\nModels SA227-TT, SA227-AT, SA227-AC and SA227-BC listed in Fairchild Service Bulletin 227-55-006, Revised January 20 1993.\n\nRequirement: 1. Modify the horizontal stabiliser aft spar attach fitting installation and the horizontal stabiliser upper and lower skins in accordance with the Accomplishment Instructions section of Fairchild Service Bulletin (SB) 226-55-010, Revised December 13 1991 or Fairchild SB 227-55-006, Revised January 20 1993, as applicable.\n\n2. Visually inspect the radius area of the rib splice strap for cracks in accordance with Figure 2 of Fairchild SB 226-55-010, Revised December 13 1991 or Figure 3 of Fairchild SB 227-55-006, Revised January 20 1993, as applicable.\n\nNote: FAA AD 93-15-01 refers.\n\nCompliance: 1. Modify in accordance with Requirement 1 before 10000 hours time in service or within 1000 hours time in service after 27 April 1995, whichever occurs later.\n\n2. Initially inspect in accordance with Requirement 2 before 10000 hours time in service or within 1000 hours time in service after 27 April 1995, whichever occurs later. Re-inspect at intervals not to exceed 5000 hours time in service.\n\nBackground: Cracks have been reported in rib splice straps. The modification will improve stabiliser aft spar attach fitting durability.","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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope: addressing a specific structural fatigue issue in specific Fairchild aircraft models. No expansion beyond the original safety purpose."},"complexity_factors":["Short, single-purpose directive (one safety issue, one aircraft family)","Only 4 defined applicability groups across 2 service bulletins","Clear binary compliance path (modify + inspect) with specific hour-based deadlines","No nested exceptions or conditional logic — requirements apply uniformly to all affected aircraft","External references limited to 2 service bulletins and 1 FAA AD for context","Technical aviation terminology present but standard for the domain (stabiliser, spar, splice strap)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Fairchild (Swearingen) SA226 and SA227 twin‑turboprops to modify the horizontal stabiliser attachment and reinforce surrounding skin, and to carry out recurring inspections of the rib splice strap per the referenced service bulletins. \n\nIt responds to discovered cracks in the tail attachment area that could lead to stabiliser failure and loss of control, so compliance is mandatory to ensure continued structural safety."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive changes operators' obligations by mandating a structural retrofit plus recurring inspections for the listed SA226/SA227 subtypes where standard maintenance would otherwise suffice. It shifts costs and scheduling responsibility to owners/operators and creates an ongoing inspection duty tied to flight‑hour thresholds (Requirements and Compliance)."},"complexity_factors":["Technical modification of structure (aft spar attach fitting and skins) requiring shop/field work and engineering conformity (Requirement 1).","Mandatory visual inspection for cracks in a localized radius area (Requirement 2) — detection relies on human inspection quality.","Clear flight‑hour compliance triggers and deadlines (Compliance: modify and initial inspect before 10,000 hours TIS or within 1,000 hours after 27 April 1995).","Recurring inspection interval (every 5,000 hours TIS) creates ongoing maintenance scheduling and recordkeeping obligations (Compliance).","Dependence on manufacturer service bulletins for workmanship and inspection standards (SB 226-55-010 and SB 227-55-006 referenced in Requirement).","Cross-reference to an FAA AD (note) may require harmonisation of international compliance records."],"plain_english_summary":"Requires modification of the horizontal stabiliser aft-spar attach fitting and the stabiliser upper/lower skins, and routine visual inspections for cracks in the rib splice strap on specified Fairchild SA226 and SA227 models. The AD says the change will improve durability after reported cracking. Owners/operators must arrange, pay for and complete the modification and initial inspection within the flight‑hour deadlines and carry out recurring inspections, creating a measurable maintenance, cost and downtime obligation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-swsa226-70-horizontal-stabiliser-aft-spar-attach-fitting","history":"/api/acts/ad-swsa226-70-horizontal-stabiliser-aft-spar-attach-fitting/history","analysis":"/api/acts/ad-swsa226-70-horizontal-stabiliser-aft-spar-attach-fitting/analysis","conflicts":"/api/acts/ad-swsa226-70-horizontal-stabiliser-aft-spar-attach-fitting/conflicts","importantCases":"/api/acts/ad-swsa226-70-horizontal-stabiliser-aft-spar-attach-fitting/important-cases","documents":"/api/acts/ad-swsa226-70-horizontal-stabiliser-aft-spar-attach-fitting/documents"}}