{"id":"F2006B01809","name":"AD/A109/24 - Main Rotor Blade - Trailing Edge","slug":"ad-a109-24-main-rotor-blade-trailing-edge","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41007,"registerId":"commonwealth-F2006B01809-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A109/24 - Main Rotor Blade - Trailing Edge","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)  \nAgusta A109 Series Helicopters\n\nAD/A109/24 Main Rotor Blade \\- Trailing Edge 5/95\n\nApplicability: All Agusta A109A and A109A II series helicopters with main rotor blades P/N 109- 0103-01.\n\nRequirement: 1. Visually inspect the trailing edge of the main rotor blades for dents, cracks or other damage in accordance with Agusta Bolletino Technico 109-50 Part I.\n\n2. Perform a close visual inspection using a 3X magnifying glass of the upper and lower surfaces of the trailing edge of the main rotor blades for cracks. Confirm all indications with dye penetrant. Inspect in accordance with Agusta Bolletino Technico 109-50 Part II.\n\nNote: RAI AD 92-190 refers.\n\nCompliance: 1. Inspect in accordance with Requirement 1 before the first flight of the day.\n\n    2. Initially inspect in accordance with Requirement 2 before 500 hours’ time in service, or within 25 hours’ time in service after 27 April 1995, whichever occurs later. Re-inspect at intervals not to exceed 25 hours’ time in service.\n\n    3. Inspect in accordance with Requirement 2 before further flight after any unexplained vibration is experienced.\n\nBackground: Several cases of cracking have been reported in the trailing edge of the main rotor blades. The cracking is caused by anomalies in production.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2183},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope as a targeted safety measure addressing specific manufacturing defects in defined helicopter models. There is no evidence of scope expansion beyond the initial safety intent."},"complexity_factors":["References to external technical manuals (Agusta Bolletino Technico 109-50 Parts I and II) for inspection procedures","Conditional compliance deadline requiring calculation ('whichever occurs later')","Cross-reference to related airworthiness directive (RAI AD 92-190)","Technical aviation terminology requiring specialized knowledge (dye penetrant testing, 'time in service', part numbers)"],"plain_english_summary":"This rule requires owners and operators of Agusta A109A and A109A II helicopters fitted with main rotor blades P/N 109-0103-01 to perform regular inspections to prevent catastrophic blade failure from manufacturing-related cracking. \n\nOperators must do daily visual checks of the trailing edge and regular detailed inspections (including 3× magnification and dye‑penetrant confirmation) on the schedule set by the rule, and inspect immediately after any unexplained vibration. Undetected cracks have led to dangerous failures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-24-main-rotor-blade-trailing-edge","history":"/api/acts/ad-a109-24-main-rotor-blade-trailing-edge/history","analysis":"/api/acts/ad-a109-24-main-rotor-blade-trailing-edge/analysis","conflicts":"/api/acts/ad-a109-24-main-rotor-blade-trailing-edge/conflicts","importantCases":"/api/acts/ad-a109-24-main-rotor-blade-trailing-edge/important-cases","documents":"/api/acts/ad-a109-24-main-rotor-blade-trailing-edge/documents"}}