{"id":"F2006B03392","name":"AD/B767/37 - Brake Metering Valve Module Shaft","slug":"ad-b767-37-brake-metering-valve-module-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42933,"registerId":"commonwealth-F2006B03392-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/37 - Brake Metering Valve Module Shaft","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)  Boeing 767 Series Aeroplanes\n\n \n\nAD/B767/37 Brake Metering Valve Module Shaft 7/90\n\nApplicability: Model 767 series aeroplanes with line positions 1-131, 133-135, 137-147, 149, 155-\n\n157, and 159-161.\n\n \n\nRequirement: Unless already accomplished replace aluminium brake metering valve module with steel shafts in accordance with Boeing Service Bulletin 767-32-0081.\n\n \n\nNote: FAA AD 89-26-01 Amdt 39-6416 refers.\n\n \n\nCompliance: Within 750 landings after 12 July 1990 or prior to the accumulation of 15,000 landings, whichever occurs later.\n\n \n\nBackground: Fractures of brace metering valve module aluminium shafts have occurred on model 757 series aeroplanes. The model 767 has similar shafts, and incorporation of steel shafts will prevent a potential loss of braking.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive implements a targeted safety remediation: it applies to defined 767 line positions and mandates replacing aluminium shafts with steel ones per Boeing SB to prevent potential loss of braking identified from 757 shaft fractures (Applicability; Requirement; Background; Compliance). It does not expand to other models or broader systems beyond the specified component and serials."},"complexity_factors":["Narrow, line-numbered applicability to specific 767 serial ranges (Applicability)","Mandatory physical replacement of a safety-critical component per a manufacturer service bulletin (Requirement)","Dual-condition compliance timing (within 750 landings after a date OR prior to 15,000 landings) creates scheduling constraints (Compliance)","Dependence on Boeing Service Bulletin for technical execution and parts, increasing reliance on manufacturer documentation (Requirement)","Cross-reference to FAA AD increases regulatory linkage and alignment requirements (Note)","Operational and financial burden falls on operators who must source parts and perform maintenance (implicit in Requirement/Compliance)","Recordkeeping and verification needed to demonstrate compliance within the stated landing counts (Compliance)"],"plain_english_summary":"Requires operators of certain Boeing 767 aeroplanes (specified line positions) to replace aluminium brake metering valve module shafts with steel shafts, following Boeing Service Bulletin 767-32-0081. The Civil Aviation Safety Authority (CASA) mandates the change and sets the deadline: within 750 landings after 12 July 1990 or before the aircraft reaches 15,000 landings, whichever is later (Applicability; Requirement; Compliance). The measure assigns the replacement and its costs to operators and aims to prevent potential braking loss identified after shaft fractures on 757s (Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on brake metering valve shafts on early-production Boeing 767 aircraft. It has not expanded beyond its original narrow safety purpose. The scope remains tightly constrained to the specific mechanical defect identified in the background section."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 3 defined elements: applicability (by line position), requirement (single action), and compliance (single time-based condition)","No cross-references to other legislation beyond a single note referencing the equivalent FAA directive","Simple conditional logic: 'whichever occurs later' is the only compound condition","No nested exceptions or sub-delegations","Single purpose: one specific mechanical replacement on one aircraft type"],"plain_english_summary":"CASA issues a mandatory Airworthiness Directive requiring owners/operators of specified Boeing 767 line numbers to replace aluminium brake metering valve module shafts with stronger steel ones, per Boeing Service Bulletin 767-32-0081. \n\nThe change responds to aluminium shaft fractures found on similar 757 components that could cause brake failures and runway accidents. Compliance is required within 750 landings after 12 July 1990 or before 15,000 total landings, whichever is later."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-37-brake-metering-valve-module-shaft","history":"/api/acts/ad-b767-37-brake-metering-valve-module-shaft/history","analysis":"/api/acts/ad-b767-37-brake-metering-valve-module-shaft/analysis","conflicts":"/api/acts/ad-b767-37-brake-metering-valve-module-shaft/conflicts","importantCases":"/api/acts/ad-b767-37-brake-metering-valve-module-shaft/important-cases","documents":"/api/acts/ad-b767-37-brake-metering-valve-module-shaft/documents"}}