{"id":"F2006B06451","name":"AD/R22/46 - MA-4-5 Carburettor","slug":"ad-r22-46-ma-4-5-carburettor","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47901,"registerId":"commonwealth-F2006B06451-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/R22/46 - MA-4-5 Carburettor","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 R22 Series Helicopters\n\n| AD/R22/46      | MA-4-5 Carburettor                                                                                                           | 3/98 |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------- | ---- |\n| Applicability: | All helicopters S/N 2571 through 2664 fitted with MA-4-5 carburettor and Carburettor Air Temperature (CAT) gauge P/N C604-6. |      |\n\nRequirement: Unless previously carried out, replace the carburettor and CAT gauge in accordance with the requirements of Robinson R-22 Service Bulletin 82, dated 03 March 1997, and Robinson Helicopter Company Kit KI-114 Revision A, dated 6 March 1997.\n\nNote: FAA AD 97-25-05 Amdt 39-10228 refers.\n\nCompliance: Within 50 hours time in service from the effective date of this Directive.\n\nThis directive become effective on the 26 February 1998.\n\nBackground: Advice has been received that the mixture control could inadvertently be placed in the idle cut position during in-flight manual leaning of the fuel/air mixture. This would cause an engine in-flight shut down with subsequent loss of helicopter control. When the carburettor is changed a flight manual amendment will be required.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a narrow, well-defined scope targeting a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined technical identifiers (serial number range and part numbers)","Single unconditional requirement with clear compliance deadline","No cross-references to other legislation or regulations beyond a reference to a US FAA directive for context","Simple cause-and-effect background explanation"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Robinson R22 helicopters (S/N 2571–2664) fitted with MA‑4‑5 carburettors and C604‑6 carburettor air temperature gauges to replace both components per Robinson Service Bulletin 82/Kit KI‑114 within 50 flight hours from 26 Feb 1998. It’s a mandatory retrofit to eliminate a design flaw that can let pilots inadvertently shut off the engine in flight, affecting in‑service aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope remains focused: it applies only to R22 helicopters S/N 2571–2664 fitted with the MA‑4‑5 carburettor and specified CAT gauge and requires their replacement per the manufacturer documents within 50 hours to address the identified mixture-control safety issue (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow applicability: single helicopter model and serial number range (Applicability).","Single prescriptive action: replace carburettor and CAT gauge per specified service bulletin and kit (Requirement).","Short compliance window: 50 hours time-in-service creates scheduling urgency (Compliance).","External reliance: required work uses manufacturer Service Bulletin 82 and Kit KI‑114 (Requirement).","Ancillary obligation: flight manual amendment required after replacement (Background).","Cross-reference to FAA AD increases traceability but not procedural complexity (Note)."],"plain_english_summary":"Requires owners/operators of Robinson R22 helicopters S/N 2571–2664 fitted with an MA‑4‑5 carburettor and CAT gauge P/N C604‑6 to replace both items using Robinson Service Bulletin 82 and Kit KI‑114 (Requirement). Compliance is mandatory within 50 hours time-in-service; the owner/operator pays the cost and must amend the flight manual after the change (Compliance; Background). The stated safety reason is to stop inadvertent selection of the mixture control to “idle cut” during manual leaning, which can cause in‑flight engine shutdown (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-r22-46-ma-4-5-carburettor","history":"/api/acts/ad-r22-46-ma-4-5-carburettor/history","analysis":"/api/acts/ad-r22-46-ma-4-5-carburettor/analysis","conflicts":"/api/acts/ad-r22-46-ma-4-5-carburettor/conflicts","importantCases":"/api/acts/ad-r22-46-ma-4-5-carburettor/important-cases","documents":"/api/acts/ad-r22-46-ma-4-5-carburettor/documents"}}