{"id":"F2006B01793","name":"AD/A109/1 Amdt 3 - Main Rotor Blade","slug":"ad-a109-1-amdt-3-main-rotor-blade","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":40991,"registerId":"commonwealth-F2006B01793-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A109/1 Amdt 3 - Main Rotor Blade","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/A109/1\n\nAmdt 3\n\n  \nMain Rotor Blade 2/88\n\nApplicability: All models fitted with main rotor blades P/N 109-0103-01-( ) (all dash numbers) which have achieved 600 or more hours component time in service.\n\nRequirement: Action in accordance with Agusta Bollettino Tecnico No 109-50 Rev A. Compliance: Part 1 of the Requirement document: At each daily inspection after 25 February\n\n1988.\n\nPart 2 of the Requirement document: Within 25 hours’ time in service after 25 February 1988, and thereafter at intervals not exceeding 25 hours’ time in service OR at the occurrence of anomalous vibratory conditions.\n\nThe Daily Inspection requirement may be accomplished by the pilot in command in which case the pilot shall enter and certify for the AD in Col 2 Part 3 of the Maintenance Release.\n\nBackground: Several cases of main rotor blade cracking have been found in service. This amendment reduces the initial inspection threshold.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2278},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment tightens the inspection threshold for the existing safety issue (main rotor blade cracking) but does not expand the directive's scope beyond the originally identified airworthiness concern or to new aircraft models."},"complexity_factors":["Incorporation by reference of external technical document (Agusta Bollettino Tecnico) not reproduced in the directive","Dual-trigger compliance system (time-based and condition-based 'anomalous vibratory conditions')","Applicability threshold requiring flight hour calculations (600+ hours component time)","Specific part number identification with wildcard dash numbers","Date-anchored compliance deadlines (25 February 1988)"],"plain_english_summary":"This mandatory Airworthiness Directive requires urgent, repeated inspections of main rotor blades (Agusta A109, P/N 109-0103-01, all dash variants) once blades have 600+ flight hours. It affects operators of those helicopters and tightens earlier inspection timing.\n\nIt responds to in-service blade cracking that could be catastrophic; inspections (daily preflight checks plus recurring detailed checks per Agusta Bollettino Tecnico No 109-50 Rev A) must begin 25 February 1988 and recur frequently."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-1-amdt-3-main-rotor-blade","history":"/api/acts/ad-a109-1-amdt-3-main-rotor-blade/history","analysis":"/api/acts/ad-a109-1-amdt-3-main-rotor-blade/analysis","conflicts":"/api/acts/ad-a109-1-amdt-3-main-rotor-blade/conflicts","importantCases":"/api/acts/ad-a109-1-amdt-3-main-rotor-blade/important-cases","documents":"/api/acts/ad-a109-1-amdt-3-main-rotor-blade/documents"}}