{"id":"F2006B03754","name":"AD/BEECH 23/40 - Horizontal Stabiliser Aft Centre Spar","slug":"ad-beech-23-40-horizontal-stabiliser-aft-centre-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43348,"registerId":"commonwealth-F2006B03754-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 23/40 - Horizontal Stabiliser Aft Centre Spar","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)  \nBeechcraft 19, 23 and 24 Series Aeroplanes\n\nAD/BEECH 23/40 Horizontal Stabiliser Aft Centre Spar 9/81\n\nApplicability: Models A23-19, 19A, M19A and B19 with S/Nos. MB-1 through MB-520; Model B19 with S/Nos. MB-521 through MB-905;\n\nModels 23, A23, A23A, B23 and C23 with S/Nos. M-1 through M-1361; Model C23 Sundowner 180 with S/Nos. M-1362 through M-2270; Models A23-24 and A24 with S/Nos. MA-1 through MA-368;\n\nModel A24R with S/Nos. MC-2 through MC-95;\n\nModels A24R, B24R and C24R Sierra 200 with S/Nos. MC-96 through MC-726.\n\nRequirement: Inspect the horizontal stabiliser skins and aft centre spar in accordance with the procedures given in Beechcraft S.I. No. 1167.\n\nCompliance: For aircraft which have exceeded 500 hours time in service, within 100 hours time in service and thereafter at intervals not exceeding 200 hours time in service until modified.\n\nBackground: The manufacturer has provided a requirement to inspect and modify the horizontal stabiliser to ensure the safe operation of the aircraft.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":3312},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original scope focused on ensuring structural integrity of the horizontal stabiliser aft centre spar in specified Beechcraft aircraft. No evidence of expansion beyond the initial safety inspection requirement."},"complexity_factors":["Multiple specific aircraft model and serial number ranges in applicability section","Conditional compliance trigger based on accumulated flight hours (500 hour threshold)","Recurring inspection obligation (every 200 hours) until corrective modification","Reference to external technical document (Beechcraft S.I. No. 1167) without reproducing content"],"plain_english_summary":"This mandatory safety order requires owners/operators of specific Beechcraft Model 19, 23, and 24 series aircraft (certain serial-number ranges) to inspect the horizontal stabiliser aft centre spar for cracks or damage. If an airplane has over 500 flight hours, inspect within 100 flight hours and repeat every 200 hours until a corrective modification is made, using Beechcraft Service Instruction No. 1167. The measure prevents potential tail-structure failure in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-23-40-horizontal-stabiliser-aft-centre-spar","history":"/api/acts/ad-beech-23-40-horizontal-stabiliser-aft-centre-spar/history","analysis":"/api/acts/ad-beech-23-40-horizontal-stabiliser-aft-centre-spar/analysis","conflicts":"/api/acts/ad-beech-23-40-horizontal-stabiliser-aft-centre-spar/conflicts","importantCases":"/api/acts/ad-beech-23-40-horizontal-stabiliser-aft-centre-spar/important-cases","documents":"/api/acts/ad-beech-23-40-horizontal-stabiliser-aft-centre-spar/documents"}}