{"id":"F2006B03662","name":"AD/BEECH 1900/43 - Canted Bulkhead at FS588.10","slug":"ad-beech-1900-43-canted-bulkhead-at-fs588-10","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43252,"registerId":"commonwealth-F2006B03662-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nBeechcraft 1900 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 1900/43 Canted Bulkhead at FS58","sectionType":"part","heading":"AD/BEECH 1900/43 Canted Bulkhead at FS588.10 8/2004","content":"# AD/BEECH 1900/43 Canted Bulkhead at FS588.10 8/2004\n\nApplicability: Model 1900, serial numbers UA-1 through UA-3.\n\nModel 1900C, serial numbers UB-1 through UB-74 and UC-1 through UC-174. Model 1900D, serial numbers UE-1 through UE-113.\n\nRequirement: Inspect the canted bulkhead at Fuselage Station (FS) 588.10 for fatigue cracks in accordance with Raytheon Aircraft Mandatory Service Bulletin SB 53-2564 Revision 2, Revised July 2003.\n\nIf cracks exist or are found during any inspection required by this Directive, before further flight, incorporate Kit No. 129-4005-1S.\n\nIncorporation of Kit No. 129-4005-1S constitutes terminating action for the inspection requirements of this Directive.\n\nNote: FAA AD 2004-09-07 Amdt 39-13596 refers.\n\nCompliance: Upon the accumulation of 5,000 hours time in service or within 600 hours time in service after 5 August 2004, whichever occurs later.\n\nIf no cracks are found, repetitively inspect thereafter at intervals not to exceed 600 hours time in service, until Kit No. 129-4005-1S is incorporated.\n\nThis Airworthiness Directive becomes effective on 5 August 2004.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific structural issue in specific aircraft. It has not expanded beyond its original purpose of mandating inspection and repair of the canted bulkhead at FS588.10."},"complexity_factors":["Single, clearly defined applicability section with specific aircraft models and serial number ranges","Straightforward two-path compliance structure (inspect, then either repair or re-inspect)","Only one technical reference to an external document (Raytheon Service Bulletin SB 53-2564 Revision 2)","Minimal defined terms (only 'time in service' used in standard aviation sense)","No nested exceptions or conditional logic beyond the basic 'if cracks found / if no cracks found' branching","Short document (approximately 200 words of substantive content)"],"plain_english_summary":"This Airworthiness Directive from CASA requires owners/operators of specific early-production Beechcraft 1900, 1900C and 1900D aircraft (listed by serial number) to inspect the canted bulkhead at Fuselage Station 588.10 for fatigue cracks starting at 5,000 flight hours (or within 600 hours after 5 Aug 2004) and to re‑inspect every 600 hours until a prescribed repair kit is fitted.\n\nIt matters because undetected fatigue cracks could undermine structural integrity; installing the repair kit eliminates the inspection requirement."},"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":4,"scope_assessment":{"changed":false,"description":"The Directive's scope aligns with its stated safety purpose: it targets specified 1900-series airframes and prescribes inspection and a terminating modification for fatigue at FS588.10. It does not broaden applicability beyond the listed serial numbers or add unrelated measures; it prescribes inspection intervals and a definitive corrective action (Kit No. 129-4005-1S) consistent with addressing the unsafe condition."},"complexity_factors":["Narrow technical focus (single structural location: canted bulkhead at FS588.10)","Applicability limited to specific model variants and serial-number ranges","Inspections must follow a manufacturer service bulletin (SB 53-2564 Rev 2), requiring technical compliance","Repeating inspection intervals (every 600 hours) until terminating modification (Kit No. 129-4005-1S) is installed","Compliance timing uses a ‘whichever occurs later’ rule (5,000 TIS or within 600 hours after a date)","Mandatory grounding-before-further-flight if cracks are found (immediate operational consequence)","Cross-reference to FAA AD increases regulatory linkage and possible interpretation issues"],"plain_english_summary":"This Airworthiness Directive requires operators of specified Beechcraft 1900 aeroplanes to inspect the canted bulkhead at fuselage station FS588.10 for fatigue cracks using Raytheon Service Bulletin SB 53-2564 Rev 2. If cracks are found, operators must install Kit No. 129-4005-1S before further flight; installing the kit ends the inspection requirement. Compliance is due at 5,000 hours TIS or within 600 hours after 5 August 2004, then every 600 hours until the kit is fitted. Operators bear inspection and repair costs; CASA enforces compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-1900-43-canted-bulkhead-at-fs588-10","history":"/api/acts/ad-beech-1900-43-canted-bulkhead-at-fs588-10/history","analysis":"/api/acts/ad-beech-1900-43-canted-bulkhead-at-fs588-10/analysis","conflicts":"/api/acts/ad-beech-1900-43-canted-bulkhead-at-fs588-10/conflicts","importantCases":"/api/acts/ad-beech-1900-43-canted-bulkhead-at-fs588-10/important-cases","documents":"/api/acts/ad-beech-1900-43-canted-bulkhead-at-fs588-10/documents"}}