{"id":"F2006B06475","name":"AD/R44/7 - Clutch Assembly","slug":"ad-r44-7-clutch-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47981,"registerId":"commonwealth-F2006B06475-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/R44/7 - Clutch Assembly","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)  \nRobinson R44 Series Helicopters\n\nAD/R44/7 Clutch Assembly 13/97\n\nApplicability: All R44 helicopter S/N 0001 through to and including 0322 fitted with C018-1 clutch assembly.\n\nRequirement: Replace C018-1 clutch assembly with a C018-2 or C018-2A clutch assembly as detailed in Robinson R44 SB 23 dated 30 May 1997.\n\nNote: FAA AD 97-16-02 Amdt 39-10092 refers.\n\nCompliance: Unless previously carried out within 50 hours time in service after the effective date of this directive or by 31 December 1997, whichever occurs first.\n\nThis airworthiness directive becomes effective on 4 December 1997.\n\nBackground: The manufacturer has advised that a number of sprag clutches assemblies were found worn excessively. This could result in loss of power to the rotor system, or should engine failure occur, an inability of the helicopter to autorotate in an emergency.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies to the set of R44 helicopters and clutch assemblies described and mandates replacement with specified assemblies per the manufacturer’s service bulletin. The text contains no indication that the set of affected aircraft, the required action, or the compliance window differs from the described intent; therefore the scope has not changed from the instrument’s stated purpose (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow applicability: specific helicopter model and serial number range (Applicability).","Single mandated technical action: replace one part type with a specified successor (Requirement).","Clear compliance window: 50 hours time-in-service or by a calendar date (Compliance / Effective date).","Dependence on an external document for procedural detail (Robinson R44 SB 23) increases operational steps though not regulatory ambiguity (Requirement).","Cross-reference to FAA AD provides an external regulatory touchpoint but does not broaden the required action (Note).","Safety rationale is factual and focused on a specific mechanical failure mode (Background)."],"plain_english_summary":"### What this directive does (mechanically)\n\n- It requires owners/operators of certain Robinson R44 helicopters to remove and replace a specific clutch assembly model (C018-1) with an updated model (C018-2 or C018-2A). (Requirement)\n- The replacement must follow the procedures set out in Robinson R44 Service Bulletin 23 dated 30 May 1997. (Requirement)\n- The rule applies to R44 helicopters with serial numbers 0001 through 0322 that are fitted with a C018-1 clutch assembly. (Applicability)\n- Compliance must occur within 50 hours time-in-service after the directive’s effective date (4 December 1997) or by 31 December 1997, whichever comes first. (Compliance / Effective date)\n\n### Who this affects\n\n- Owners and operators of Robinson R44 helicopters S/N 0001–0322 that currently have the C018-1 clutch assembly installed. (Applicability)\n- Maintenance organisations and engineers who will perform the replacement in accordance with the manufacturer’s service bulletin. (Requirement)\n\n### Why it matters (stated reason and mechanical implication)\n\n- The manufacturer reported that a number of sprag clutch assemblies were found to be worn excessively. (Background)\n- The stated safety risk is loss of power transmission to the rotor system, or, if the engine fails, a possible inability to autorotate in an emergency. The directive addresses that mechanical risk by mandating replacement. (Background / Requirement)\n\n### Practical effects, costs and incentives (mechanics, not judgement)\n\n- Who pays: helicopter owners/operators bear the direct costs of parts (C018-2 or C018-2A) and labour to perform the replacement. (Requirement)\n- Who decides scheduling: the regulator (Civil Aviation Safety Authority) sets the mandatory compliance window; owners/operators decide when within that window to schedule the work, limited by the 50-hour or 31-December deadline. (Compliance / Effective date)\n- Implementation mechanics: work must follow Robinson R44 SB 23 (30 May 1997), so technicians must use that service bulletin as the method and standard for replacement. This channels technical compliance through the manufacturer’s instructions. (Requirement)\n- Compliance burden and opportunity cost: operators must take helicopters out of service for the replacement, incurring downtime and associated flight-hour opportunity costs. The directive’s short compliance window concentrates that burden in the weeks/months after the effective date. (Compliance)\n- Effects on maintenance providers and markets: authorised or independent maintenance organisations that can perform the SB procedures may gain business from the replacement work. The directive does not itself change ownership, certification, or broader market rules; it mandates a specific parts upgrade and a defined maintenance action. (Requirement)\n\n### Implementation risk, discretion and cross-reference\n\n- The directive is prescriptive and time-limited: it leaves little regulatory discretion about whether to replace the part — operators must comply within the stated timeframe. (Compliance)\n- The directive references the FAA airworthiness directive (FAA AD 97-16-02) and the manufacturer’s service bulletin, creating cross-jurisdictional and manufacturer-dependent implementation paths for compliance. That means operators may look to the FAA AD and the SB for technical detail and for confirmations of the required action. (Note / Requirement)\n\n### Trade-offs and concrete impacts to report\n\n- Benefit claimed: reduces the risk of clutch failure and its operational consequences by installing an updated assembly. (Background / Requirement)\n- Costs borne: parts, labour, and aircraft downtime paid by owners/operators; any secondary scheduling or revenue effects for operators during compliance. (Requirement / Compliance)\n- Concentration of benefit and cost: the safety benefit accrues to flight safety generally and to individual aircraft users, while the cost is concentrated on the owners/operators of affected serial-numbered helicopters. (Applicability / Background)\n\n(References: Applicability; Requirement (Robinson R44 SB 23 dated 30 May 1997); Compliance; Effective date 4 December 1997; Note (FAA AD 97-16-02); Background.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a single purpose: mandating replacement of a specific defective part. It has not expanded beyond its original intent."},"complexity_factors":["Single, specific mechanical component targeted (C018-1 clutch assembly)","Narrow applicability: only 322 specific aircraft (S/N 0001-0322)","Simple binary compliance requirement: replace old part with new part","Clear deadline structure (50 hours OR fixed date, whichever first)","No nested definitions, cross-references to other legislation, or conditional exceptions","Only one external reference (FAA AD and manufacturer service bulletin) for technical guidance"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a recall notice, but for aircraft parts.\n\n**What it does:** It orders owners and operators of specific Robinson R44 helicopters to replace a faulty clutch assembly (model C018-1) with an improved version (C018-2 or C018-2A).\n\n**Who it affects:** Anyone who owns or operates a Robinson R44 helicopter with serial numbers 0001 through 0322 that still has the old C018-1 clutch assembly installed.\n\n**Why it matters:** The old clutch was wearing out too quickly. If it failed, two dangerous things could happen:\n- **Loss of rotor power:** The engine might keep running but not spin the helicopter's blades properly\n- **Failed emergency landing:** If the engine died, the pilot might not be able to perform an \"autorotation\" — a critical emergency manoeuvre where the rotor keeps spinning without engine power, allowing a controlled descent\n\n**When it had to be done:** Within 50 flight hours after 4 December 1997, or by 31 December 1997 — whichever came first.\n\n**The bottom line:** This was an urgent safety fix to prevent helicopters from falling out of the sky due to clutch failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-r44-7-clutch-assembly","history":"/api/acts/ad-r44-7-clutch-assembly/history","analysis":"/api/acts/ad-r44-7-clutch-assembly/analysis","conflicts":"/api/acts/ad-r44-7-clutch-assembly/conflicts","importantCases":"/api/acts/ad-r44-7-clutch-assembly/important-cases","documents":"/api/acts/ad-r44-7-clutch-assembly/documents"}}