{"id":"F2006B09311","name":"AD/EC 120/5 - Rotor Flight Controls","slug":"ad-ec-120-5-rotor-flight-controls","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53427,"registerId":"commonwealth-F2006B09311-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \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 CAR 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.","sortOrder":0},{"sectionNumber":"AD/EC 120/5 Rotor Flight Controls 11/200","sectionType":"part","heading":"AD/EC 120/5 Rotor Flight Controls 11/2001 DM","content":"# AD/EC 120/5 Rotor Flight Controls 11/2001 DM\n\nApplicability: Model EC 120 B helicopters, serial number 1001 through 1029.\n\nRequirement: 1. Check the attachment of the bolted assembly of the torque tube in accordance with paragraph 2.B.1 of Eurocopter EC 120 Alert Service Bulletin (ASB) 67A003.\n\nIf the aircraft is equipped with a torque tube with double locking, no further action is required.\n\n    2. If the aircraft is equipped with a torque tube with single locking:\n\n    Check the security of the bolted assembly of the torque tube in accordance with paragraph 2.B.2 of ASB 67A003; and,\n\n    b. Modify the torque tube attachments in accordance with paragraph 2.B.3 of ASB 67A003.\n\nNote: DGAC AD 2001-373-008(A) refers.\n\nCompliance: 1. Within 50 hours time in service after 5 September 2001.\n\n    2.a. Within 50 hours time in service after Requirement 1 compliance, and thereafter at intervals not to exceed 50 hours time in service until compliance with Requirement 2.b.\n\n    2.b. At the next 500-hour or 24 month inspection after 5 September 2001, whichever occurs later.\n\nThis Airworthiness Directive becomes effective on 5 September 2001.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's applicability and corrective actions are explicitly stated (Model EC120B, serials 1001–1029; inspection and modification per ASB 67A003). The text contains no indication that the AD changes scope from its stated safety-corrective purpose; it prescribes targeted inspection/modification and compliance intervals without expanding applicability or function."},"complexity_factors":["Limited applicability to a single helicopter model and a narrow serial-number range reduces scope complexity.","Dependence on an external document (Eurocopter ASB 67A003) for procedural detail creates a procedural dependency.","Conditional requirements (no action if double-locking; inspections and modification if single-locking) introduce branching compliance paths.","Multiple, staggered compliance intervals (50 flight hours; recurring 50‑hour checks until modification; next 500‑hour or 24‑month inspection) add scheduling complexity.","Technical maintenance action requiring qualified personnel and possible parts/modification increases operational complexity."],"plain_english_summary":"This Airworthiness Directive requires operators of Eurocopter EC120B helicopters (serial numbers 1001–1029) to inspect the torque-tube bolted attachment and, if the tube has a single locking, to secure and modify the attachment in accordance with Eurocopter Alert Service Bulletin 67A003 to address a potential unsafe condition. Compliance deadlines are given in flight-hour and inspection intervals; operators bear inspection and modification costs and must adjust maintenance scheduling to meet the mandated intervals."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific scope (one helicopter model, specific serial numbers, specific mechanical component). It has not expanded beyond its original safety purpose."},"complexity_factors":["Single defined aircraft model and serial number range (EC 120 B, serials 1001–1029)","Simple binary condition: double locking vs single locking torque tube","Clear compliance deadlines based on flying hours and calendar dates","No nested exceptions or cross-references to other legislation beyond a single reference to a French aviation directive (DGAC AD 2001-373-008(A)) and the manufacturer's service bulletin","Total length: approximately 250 words","Only 2 main requirements with straightforward sub-requirements"],"plain_english_summary":"This CASA safety order requires owners/operators of Eurocopter EC120B helicopters (serials 1001–1029) to inspect the rotor torque-tube attachment within 50 flight hours of 5 Sept 2001. Aircraft with the safer double‑locking torque tube need no further action; those with single‑locking fittings must be rechecked every 50 hours until a mandated modification is installed at the next major inspection (500 hours or 24 months). The measure prevents torque‑tube failure that could cause loss of rotor control and a crash."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ec-120-5-rotor-flight-controls","history":"/api/acts/ad-ec-120-5-rotor-flight-controls/history","analysis":"/api/acts/ad-ec-120-5-rotor-flight-controls/analysis","conflicts":"/api/acts/ad-ec-120-5-rotor-flight-controls/conflicts","importantCases":"/api/acts/ad-ec-120-5-rotor-flight-controls/important-cases","documents":"/api/acts/ad-ec-120-5-rotor-flight-controls/documents"}}