{"id":"F2006B07186","name":"AD/SWSA226/46 - Nose Wheel Steering System - Modification","slug":"ad-swsa226-46-nose-wheel-steering-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114957,"registerId":"commonwealth-F2006B07186-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SWSA226/46 - Nose Wheel Steering System - Modification","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/SWSA226/46 Nose Wheel Steering System \\- Modification 10/83\n\nApplicability: Model SA226-T with S/No. T-249, and S/Nos. T-277 to T-291. Model SA226-TB with S/No. T-276 and S/Nos. T-292 to T-417. Model SA226-AT with S/Nos. AT-025 to AT-069, and AT-071 to AT-074. Model SA226-TC with S/Nos. TC-212 to TC-\n\n419. Also, any SA226 model, regardless of serial number, modified in accordance with Swearingen SB 32-016.\n\nModel SA227-AC S/Nos. AC-398 to AC-599 and all models with hydraulic nose wheel steering. Model SA227-AT with S/No. AT-070, and S/Nos. AT-423 to AT-\n\n596. Model SA227-TT with S/Nos. TT-421 to TT-597.\n\nDocument: 1. For affected SA226 aircraft Swearingen SB 32-037, or if optional tiller wheel steering is installed SB 32-039.\n\n2. For affected SA227 aircraft Swearingen SB 32-006.\n\nNote: FAA AD 83-15-09 refers.\n\nCompliance: Within 100 hours time in service after 30 November 1983.\n\nBackground: Reports of uncontrollable nose wheel steering malfunctions resulting in substantial damage to aircraft have been indicated by the airworthiness authority of the country of manufacture.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific mechanical safety issue. The scope remains tightly focused on nose wheel steering modifications for the identified aircraft models, consistent with the original purpose of preventing steering malfunctions."},"complexity_factors":["Extensive serial number lists creating applicability complexity (approximately 15 separate serial number ranges across 6 aircraft models)","Cross-reference to foreign regulatory instrument (FAA AD 83-15-09)","Conditional applicability based on prior modifications (SB 32-016)","Multiple manufacturer service bulletins referenced (3 different SBs depending on aircraft model and configuration)","Time-based compliance requirement with specific deadline calculation"],"plain_english_summary":"This CASA Airworthiness Directive mandates modifications to the hydraulic nose-wheel steering on certain Fairchild (Swearingen) SA226 and SA227 aircraft per the manufacturer service bulletins (SB 32-037, SB 32-039 for SA226; SB 32-006 for SA227). It applies to specified serial-numbered aircraft (including those previously modified under SB 32-016).\n\nIt responds to reports of uncontrollable nose-wheel steering malfunctions causing substantial damage and potential loss of control; compliance was required within 100 flight hours after 30 November 1983."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive sets scope by listing affected models/serials and aircraft modified per SB 32-016, and mandates modification within a set timeframe to address reported malfunctions. The source does not indicate a change from any earlier scope; it clarifies and applies corrective action to the identified fleet."},"complexity_factors":["Detailed applicability by numerous model types and specific serial-number ranges increases administrative tracking.","Different Service Bulletins apply depending on model and optional tiller-wheel configuration (SB 32-037, SB 32-039, SB 32-006, SB 32-016).","Fixed compliance window (100 hours TIS after 30 Nov 1983) may force expedited maintenance and operational disruption.","Possible need to source parts and authorised maintenance capability to perform SB-specified modifications.","Cross-reference to FAA AD 83-15-09 adds an external regulatory dependency for interpretation or precedent."],"plain_english_summary":"This airworthiness directive requires owners/operators of specified Fairchild (Swearingen) SA226 and SA227 aeroplanes to modify their nose-wheel steering systems per the listed Swearingen Service Bulletins to address reported uncontrollable steering malfunctions. Affected aircraft are identified by model and serial number, and include those modified under SB 32-016 or with hydraulic nose-wheel steering. Compliance is mandatory within 100 hours time-in-service after 30 November 1983; owners/operators bear modification costs and scheduling downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-swsa226-46-nose-wheel-steering-system-modification","history":"/api/acts/ad-swsa226-46-nose-wheel-steering-system-modification/history","analysis":"/api/acts/ad-swsa226-46-nose-wheel-steering-system-modification/analysis","conflicts":"/api/acts/ad-swsa226-46-nose-wheel-steering-system-modification/conflicts","importantCases":"/api/acts/ad-swsa226-46-nose-wheel-steering-system-modification/important-cases","documents":"/api/acts/ad-swsa226-46-nose-wheel-steering-system-modification/documents"}}