{"id":"F2006B01847","name":"AD/A119/7 - Transmission Support Fittings Attach Bolts","slug":"ad-a119-7-transmission-support-fittings-attach-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41043,"registerId":"commonwealth-F2006B01847-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\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 CASR 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.\n\n![](image.001.png)  \n\nAgusta A119 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/A119/7 Transmission Support Fittings ","sectionType":"part","heading":"AD/A119/7 Transmission Support Fittings Attach Bolts 6/2004","content":"# AD/A119/7 Transmission Support Fittings Attach Bolts 6/2004\n\nDM\n\nApplicability: Model A119 helicopters, with serial numbers up to and including 14037, except serial number 14036.\n\n    Accomplish the requirements of Part I of Agusta Technical Bulletin No. 119-8, dated 7 April 2004.\n\n    2. Accomplish the requirements of Part II of Agusta Technical Bulletin No. 119-8.\n\nNote: ENAC AD 2004-108 refers.\n\nCompliance: 1. Within 5 flight hours after 21 April 2004.\n\n2. Within 25 flight hours after 21 April 2004, but not later than 30 September 2004\\. This Airworthiness Directive becomes effective on 21 April 2004.\n\nBackground: Reports were received of fractured bolts that secure the transmission support fittings to the structure on two in-service helicopters. In both cases, the fracture was due to fatigue caused by insufficient bolt torque.\n\n![](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 15 April 2004\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD addresses a specific unsafe condition (fractured transmission-support bolts caused by insufficient torque) and prescribes manufacturer procedures to correct that condition. It does not broaden the subject matter beyond that original safety purpose; the requirements are narrowly targeted to the affected serial-numbered aircraft and the specific corrective actions in the manufacturer's Technical Bulletin."},"complexity_factors":["Single aircraft model (Agusta A119) only","Serial-number range with a single exception (up to and including 14037, except 14036)","Two required actions referencing an external document: Agusta Technical Bulletin No. 119-8 (Part I and Part II)","Two short, distinct compliance windows (within 5 flight hours; within 25 flight hours but not later than a calendar date)","Reference to an external authority (ENAC AD 2004-108)","No separate definitions section, few cross-references within the instrument itself","Short document length and minimal conditional logic"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- This is an Airworthiness Directive (a mandatory safety order issued under CASR subregulation 39.1(1)) that requires specific maintenance actions on a subset of Agusta A119 helicopters.\n- It applies to Agusta Model A119 helicopters with serial numbers up to and including 14037, except serial number 14036. (Applicability)\n- It requires operators to carry out the actions described in Agusta Technical Bulletin No. 119-8: Part I must be done within 5 flight hours after 21 April 2004; Part II must be done within 25 flight hours after 21 April 2004 but no later than 30 September 2004. (Requirements and Compliance)\n- The directive became effective on 21 April 2004. (Compliance)\n\n**Why this action was ordered (official rationale)**\n\n- The Background says there were reports of fractured bolts that attach the transmission support fittings to the airframe on two in-service helicopters. The fractures were caused by fatigue due to insufficient bolt torque. The required actions follow the manufacturer’s Technical Bulletin intended to correct that unsafe condition. (Background)\n\n**Who is affected and who pays**\n\n- Directly affected: owners and operators of the specified Agusta A119 helicopters, and the maintenance organisations or engineers who work on them. (Applicability)\n- Costs are borne by those operators: labour to carry out the bulletin instructions, any replacement parts or new bolts, and aircraft downtime while the work is done. Regulators (CASA) enforce the requirement; the CASA delegate issued the AD. (CASR subreg 39.1(1) enforcement framework)\n\n**What behaviour changes are required**\n\n- Operators must inspect/repair/replace and correctly torque the bolts and fittings as set out in Agusta Technical Bulletin No. 119-8 (Part I and Part II), and record compliance. They must meet the short compliance windows specified (5 flight hours and 25 flight hours / 30 Sep 2004). (Requirements and Compliance)\n\n**Implementation and operational considerations (trade-offs, risks, and incentives)**\n\n- Compliance timing is short, so operators may need to schedule immediate maintenance, possibly causing flight cancellations or rearranged operations.\n- The directive references the manufacturer’s technical instructions (the Technical Bulletin). The effectiveness of the AD depends on the clarity and completeness of that Bulletin and on availability of authorised maintenance personnel and any replacement parts.\n- The benefit is concentrated (reduces risk of bolt failure on the specified aircraft); the cost is also concentrated on those operators. There is limited scope for substitution — an operator must perform the prescribed maintenance or risk regulatory non‑compliance and the unsafe condition.\n- Enforcement is mandatory under CASR; failure to comply can expose operators to regulatory penalties and to the continuing safety risk the AD seeks to remove.\n\n**Cross-references**\n\n- The AD refers to Agusta Technical Bulletin No. 119-8 (Parts I and II) for the exact technical steps, and notes ENAC AD 2004-108 as a related foreign authority action. (Requirements, Note)\n\n(Section references in the AD: Applicability; Requirement items 1 and 2; Compliance; Background.)"},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with narrow, targeted scope addressing a specific mechanical defect in a specific aircraft model. The scope matches the original intent of correcting an unsafe condition."},"complexity_factors":["Single, specific applicability (one helicopter model, defined serial number range with one exception)","Only two compliance actions required, both referencing an external technical document","No defined terms section, no cross-references to other legislation beyond a single note about an Italian aviation directive (ENAC AD 2004-108)","Simple conditional structure: if you have this helicopter, do these two things by these deadlines","Background is factual and brief (two paragraphs)","Total length is approximately one page"],"plain_english_summary":"This is a **safety order for helicopters** issued by Australia's aviation safety regulator (CASA). It requires owners and operators of specific Agusta A119 helicopters to inspect and fix a dangerous problem with bolts that hold the transmission (the part that transfers power from the engine to the rotor blades) in place.\n\n**What's the problem?**\nTwo helicopters in service had bolts break due to metal fatigue caused by bolts not being tightened enough. If these bolts fail completely, the transmission could detach from the helicopter structure — a catastrophic safety risk.\n\n**Who must act?**\nAnyone who owns or operates an Agusta A119 helicopter with a serial number up to 14037 (except serial number 14036).\n\n**What must they do?**\nFollow a technical bulletin from the manufacturer (Agusta) in two stages:\n- **Part I**: Within 5 flight hours after 21 April 2004\n- **Part II**: Within 25 flight hours after 21 April 2004, but no later than 30 September 2004\n\n**Why it matters:**\nThis directive prevents potential fatal accidents by catching fatigued bolts before they fail. It shows how aviation safety works through mandatory compliance with manufacturer instructions when defects are discovered in service."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a119-7-transmission-support-fittings-attach-bolts","history":"/api/acts/ad-a119-7-transmission-support-fittings-attach-bolts/history","analysis":"/api/acts/ad-a119-7-transmission-support-fittings-attach-bolts/analysis","conflicts":"/api/acts/ad-a119-7-transmission-support-fittings-attach-bolts/conflicts","importantCases":"/api/acts/ad-a119-7-transmission-support-fittings-attach-bolts/important-cases","documents":"/api/acts/ad-a119-7-transmission-support-fittings-attach-bolts/documents"}}