{"id":"F2006B06449","name":"AD/R22/44 - V Belt Upper Sheave","slug":"ad-r22-44-v-belt-upper-sheave","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47896,"registerId":"commonwealth-F2006B06449-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/R22/44 - V Belt Upper Sheave","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Robinson R22 Series Helicopters\n\n \n\nAD/R22/44 V Belt Upper Sheave 9/96\n\nApplicability: All R22 helicopters fitted with P/N A170-1 or -2 Revision I or J sheaves. These sheaves were originally installed on R22 helicopters S/N 1441 through 2096 and on overhauled R22s completed from May 1990 through May 1992.\n\n \n\nRequirement: Unless previously carried out action in accordance with Robinson Service Bulletin SB-77.\n\n \n\nNote: FAA AD 96-09-29 Amdt 39-9605 refers.\n\n \n\nCompliance: Within 100 hours time in service from 15 August 1996 or by 20 November 1996, whichever occurs first.\n\n \n\nBackground: The manufacturer has advised that cracked sheaves have been reported and, if not detected in time, failure of a cracked sheave could lead to a catastrophic failure of the drive system.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive targeting a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection/replacement of cracked upper sheaves."},"complexity_factors":["Single, clearly defined applicability clause targeting specific part numbers and serial number ranges","One straightforward requirement referencing an external service bulletin","Simple binary compliance deadline (whichever occurs first of two dates)","No defined terms section, no cross-references to other legislation beyond a note about the corresponding FAA directive","Minimal conditional logic (only the 'unless previously carried out' exception)","Total length is approximately 150 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of specified Robinson R22 helicopters (S/Ns 1441–2096 and certain 1990–92 overhauuls) fitted with upper sheave P/N A170‑1/‑2 (Rev I or J) to comply with Robinson Service Bulletin SB‑77 to inspect/replace the upper sheave for cracks. It responds to reported cracked sheaves that can cause catastrophic drive‑system failure and loss of power, making compliance critical for safety and legality."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to R22 helicopters fitted with P/N A170-1 or -2 Revision I or J sheaves and mandates action per Robinson SB-77 within the stated time limits. The text does not expand or narrow that applicability beyond the stated parts, serial ranges and deadlines (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow, parts‑based applicability: targets sheaves with specific part numbers and revisions on defined R22 serial ranges (Applicability).","Fixed compliance window: actions must occur within 100 hours TIS from a set date or by a fixed calendar date, whichever is first (Compliance).","Mandated method reference: compliance requires following Robinson Service Bulletin SB‑77 rather than prescribing procedures in the AD text (Requirement).","Safety‑critical physical inspection/repair: involves detection of cracks and potential part replacement, creating operational downtime and direct maintenance cost for owners (Background; Requirement).","No regulatory discretion given: the AD sets mandatory compliance rather than optional guidance (Requirement; Compliance).","Link to foreign directive: notes FAA AD 96-09-29, indicating alignment with overseas certification actions (Note).","Concentrated affected population: applies only to R22s with the listed sheaves, concentrating costs on a defined operator subset (Applicability)."],"plain_english_summary":"Requires inspection or corrective action on specified upper V-belt sheaves (P/N A170-1 or -2 Rev I/J) fitted to Robinson R22 helicopters within 100 flight hours of 15 August 1996 or by 20 November 1996. Affects owners/operators of those R22s, who must carry out actions described in Robinson Service Bulletin SB‑77 because cracked sheaves have been reported and could lead to drive‑system failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-r22-44-v-belt-upper-sheave","history":"/api/acts/ad-r22-44-v-belt-upper-sheave/history","analysis":"/api/acts/ad-r22-44-v-belt-upper-sheave/analysis","conflicts":"/api/acts/ad-r22-44-v-belt-upper-sheave/conflicts","importantCases":"/api/acts/ad-r22-44-v-belt-upper-sheave/important-cases","documents":"/api/acts/ad-r22-44-v-belt-upper-sheave/documents"}}