{"id":"F2006B02671","name":"AD/B727/148 - Fuel Actuator Shutoff Valve","slug":"ad-b727-148-fuel-actuator-shutoff-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41987,"registerId":"commonwealth-F2006B02671-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/148 - Fuel Actuator Shutoff Valve","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)  \nBoeing 727 Series Aeroplanes\n\nAD/B727/148 Fuel Actuator Shutoff Valve 6/95\n\nApplicability: All model 727 series aircraft fitted with J.C. Carter actuator P/N 40574-2 used in any of the following J.C. Carter fuel system valves.\n\n| J.C Carter P/N | Boeing P/N  |\n| -------------- | ----------- |\n| 6563           | 10-60529-1  |\n| 60128          | 10-60529-5  |\n| 61163          | 10-60529-8  |\n| 61183          | 10-60529-10 |\n| 61185          | 10-60529-11 |\n\nNote: The above valve assemblies are used on the 727 fuel system crossfeed positions.\n\nRequirement: Action in accordance with J.C. Carter SB 61163-28-08. Compliance: By 31 May 1997.\n\nBackground: The valve manufacturer has advised that while functional testing a Boeing 737 gate valve, when the valve was selected to either the “open” or “close” position the actuator suffered a clutch slippage problem whenever the temperature dropped below minus twenty degrees C (minus five degrees F).","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific technical requirement with clear applicability criteria","Only 5 part numbers listed in a simple table format","One compliance deadline with no conditional exceptions","No defined terms section or complex cross-referencing","Background explanation is straightforward and technical but not legally complex","Total length is extremely short (under 300 words)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance action on certain aircraft.\n\n**What it does:**\nOrders owners and operators of **Boeing 727 aircraft** to inspect or replace a specific fuel valve actuator (made by J.C. Carter, part number 40574-2) that is used in the aircraft's fuel crossfeed system.\n\n**Who it affects:**\nAnyone operating Boeing 727 series aircraft in Australia that have the specified J.C. Carter fuel valves installed. The directive lists five specific valve part numbers that are affected.\n\n**Why it matters:**\nThe manufacturer discovered a dangerous defect: when temperatures drop below **minus 20°C**, the actuator's clutch can slip when the valve is moved to \"open\" or \"close\" positions. This could prevent the fuel valve from operating properly — potentially causing fuel system failures or engine problems in cold weather. The directive requires compliance by **31 May 1997** to eliminate this safety risk.\n\n**What must be done:**\nOperators must follow the manufacturer's Service Bulletin (SB 61163-28-08) to fix the problem."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope, as expressed, targets all Boeing 727 series aircraft fitted with J.C. Carter actuator P/N 40574-2 in the specified valve assemblies and requires action per J.C. Carter SB 61163-28-08 by 31 May 1997 (Applicability; Requirement; Compliance). The text supplied does not indicate any expansion or narrowing of that scope from the original stated purpose of addressing the actuator clutch slippage issue reported by the manufacturer (Background)."},"complexity_factors":["Narrow applicability limited to specific aircraft model and specific actuator and valve part numbers (Applicability).","Mandatory compliance tied to an external manufacturer service bulletin rather than containing detailed steps within the directive (Requirement).","Fixed compliance deadline creates scheduling pressure for operators (Compliance).","Technical nature of the underlying problem (actuator clutch slippage below −20°C) requires qualified maintenance resources, but the AD does not describe verification or reporting procedures (Background; Requirement)."],"plain_english_summary":"CASA requires operators of Boeing 727s fitted with J.C. Carter actuator P/N 40574-2 in specified valve assemblies to carry out J.C. Carter Service Bulletin 61163-28-08 by 31 May 1997.  \n\nThe measure addresses reported actuator clutch slippage below −20°C; operators must obtain and implement the bulletin and bear the associated costs, parts, and downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-148-fuel-actuator-shutoff-valve","history":"/api/acts/ad-b727-148-fuel-actuator-shutoff-valve/history","analysis":"/api/acts/ad-b727-148-fuel-actuator-shutoff-valve/analysis","conflicts":"/api/acts/ad-b727-148-fuel-actuator-shutoff-valve/conflicts","importantCases":"/api/acts/ad-b727-148-fuel-actuator-shutoff-valve/important-cases","documents":"/api/acts/ad-b727-148-fuel-actuator-shutoff-valve/documents"}}