{"id":"F2006B03757","name":"AD/BEECH 23/43 - Trailing Edge Flaps","slug":"ad-beech-23-43-trailing-edge-flaps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43352,"registerId":"commonwealth-F2006B03757-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 23/43 - Trailing Edge Flaps","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 23/43 Trailing Edge Flaps 9/84\n\nApplicability: All 19, 23 and 24 series.\n\nRequirement: Inspect flap internal structure at the flap hinge arm attachment ribs for corrosion.\n\nNote: This inspection will require leading edge skin removal or installation of inspection panels to a scheme approved by the Secretary.\n\nCompliance: 1. Unless already accomplished, for aircraft which have achieved 5 years since date of manufacture, within 25 hours time in service after 12 September 1984 or 3 months, whichever occurs first and thereafter at intervals not exceeding 3 years.\n\n2. Unless already accomplished, for all other aircraft: before achieving 5 years since date of manufacture and thereafter at intervals not exceeding 3 years.\n\nBackground: Numerous Major Defect Reports have indicated that an advanced state of corrosion can exist without external indications. In some instances more than half of the hinge arm was corroded away.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1959},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains its original, narrow scope of mandating specific corrosion inspections for Beechcraft 19/23/24 series flap hinge structures. No expansion beyond the initial safety intent is evident."},"complexity_factors":["Dual compliance pathways based on aircraft age relative to manufacture date","Technical aviation terminology requiring domain knowledge (time in service, hinge arm attachment ribs, leading edge skin)","Requirement for external Secretary approval for alternative inspection panel installation","Nested conditional timing triggers ('unless already accomplished', 'whichever occurs first')"],"plain_english_summary":"This directive requires owners/operators of Beechcraft Models 19, 23 and 24 to inspect the internal flap structure—especially hinge-arm attachments—for hidden corrosion, which may need wing skin removal or installation of Secretary‑approved inspection hatches. Initial timing depends on aircraft age with recurring checks every three years. It’s intended to catch unseen corrosion that can severely weaken hinge arms and risk flap failure in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-23-43-trailing-edge-flaps","history":"/api/acts/ad-beech-23-43-trailing-edge-flaps/history","analysis":"/api/acts/ad-beech-23-43-trailing-edge-flaps/analysis","conflicts":"/api/acts/ad-beech-23-43-trailing-edge-flaps/conflicts","importantCases":"/api/acts/ad-beech-23-43-trailing-edge-flaps/important-cases","documents":"/api/acts/ad-beech-23-43-trailing-edge-flaps/documents"}}