{"id":"F2006B03302","name":"AD/B767/120 - Alternate Brake Selector Valve","slug":"ad-b767-120-alternate-brake-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42739,"registerId":"commonwealth-F2006B03302-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/120 - Alternate Brake Selector 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 767 Series Aeroplanes\n\nAD/B767/120 Alternate Brake Selector Valve 6/2000\n\nApplicability: Model 767-200, \\-300 and \\-300F series aircraft, line number 1 through 607 inclusive, equipped with P/N S160T300-series carbon brakes.\n\nRequirement: Replace the hydraulic reducer fitting in the return port of the alternate brake selector valve with a new restrictor fitting in accordance with the original, Revision 1 or 2 of Boeing Service Bulletin 767-32-0152.\n\nNote: FAA AD 99-27-05 Amdt 39-11486 refers.\n\nCompliance: Unless previously carried out, by 8 February 2001.\n\nThis Airworthiness Directive becomes effective on 15 June 2000.\n\nBackground: Advice has been received that a brake housing fractured due to the higher loads associated with brake vibration during landing gear retraction. The action specified in this Directive should prevent a failure of the brake housing.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose. It has not expanded beyond its original intent of addressing a specific brake housing fracture risk on defined aircraft."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined elements: specific aircraft models, line numbers, part numbers, and the service bulletin reference","Single, clear compliance requirement with no exceptions or conditional logic","No cross-referencing to other legislation sections","Straightforward applicability test (model number + line number + brake type)","Single deadline with one exemption (\"unless previously carried out\")"],"plain_english_summary":"This is a **safety order for specific Boeing 767 aircraft** that requires airlines to replace a particular hydraulic part in the braking system.\n\n**What it does:**\n- Mandates replacement of a \"hydraulic reducer fitting\" with a new \"restrictor fitting\" in the alternate brake selector valve\n- This change must follow Boeing's official repair instructions (Service Bulletin 767-32-0152)\n\n**Who it affects:**\n- Boeing 767-200, -300, and -300F aircraft with serial numbers 1 through 607\n- Only applies to planes with specific carbon brake systems (part number S160T300-series)\n\n**Why it matters:**\n- A brake housing broke on one of these aircraft due to vibration stress during landing gear retraction\n- This failure could cause serious safety problems\n- The new restrictor fitting reduces hydraulic pressure to prevent this type of fracture\n\n**Deadline:**\n- Airlines had to complete this fix by 8 February 2001 (unless already done)\n- The order took effect on 15 June 2000\n\n**Key point:** This is a mandatory repair, not optional. Airlines cannot fly these aircraft without making this change."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text confines its effect to a specific hardware replacement on a defined subset of Boeing 767 aircraft (models, line numbers 1–607, with P/N S160T300-series carbon brakes) to address a reported brake housing fracture due to vibration during gear retraction. The directive does not broaden or alter that technical scope beyond prescribing the replacement per Boeing Service Bulletin 767-32-0152 and setting a compliance deadline (Requirement; Applicability; Background; Compliance)."},"complexity_factors":["Narrow applicability defined by aircraft model, line numbers and specific brake part number (Applicability)","Single, clearly-specified mechanical action: replace one fitting with another per a named Boeing Service Bulletin (Requirement)","Fixed compliance deadline and effective date requiring scheduling of maintenance (Compliance; effective date)","Dependence on an external normative document (Boeing Service Bulletin) for procedural details (Requirement)","Possible logistical issues: parts procurement, certified maintenance provider availability, and aircraft downtime (Requirement; Compliance)","Reference to a related foreign AD (FAA AD 99-27-05), which may require coordination for internationally operated aircraft (Note)"],"plain_english_summary":"This directive mandates replacing a hydraulic reducer in the alternate brake selector valve with a restrictor fitting per Boeing Service Bulletin 767-32-0152. It targets Boeing 767-200/300/300F airframes (line numbers 1–607) fitted with S160T300-series carbon brakes.\n\nIt aims to prevent brake-housing fractures caused by vibration during gear retraction. Operators bear parts, labour and downtime costs and must have approved maintenance organisations perform the work to meet the safety requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-120-alternate-brake-selector-valve","history":"/api/acts/ad-b767-120-alternate-brake-selector-valve/history","analysis":"/api/acts/ad-b767-120-alternate-brake-selector-valve/analysis","conflicts":"/api/acts/ad-b767-120-alternate-brake-selector-valve/conflicts","importantCases":"/api/acts/ad-b767-120-alternate-brake-selector-valve/important-cases","documents":"/api/acts/ad-b767-120-alternate-brake-selector-valve/documents"}}