{"id":"F2006B03414","name":"AD/B767/60 - Brake Wear Limit","slug":"ad-b767-60-brake-wear-limit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42955,"registerId":"commonwealth-F2006B03414-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/60 - Brake Wear Limit","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/B767/60 Brake Wear Limit 1/92\n\nApplicability: Model 767 series, equipped with brake part number identified in paragraph (a) of the requirement document.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 91-18-10 Amdt 39- 8013.\n\nCompliance: As specified in the requirement document, with a revised effective date of 12 January 1991 for Australian Registered Aircraft.\n\nBackground: An investigation by the FAA of a runway excursion by a transport category aircraft following a rejected takeoff, has revealed that the majority of brake assemblies were neat the current maximum wear limit and unable to absorb the required takeoff energy. This Directive requires new maximum brake wear limits. The effective date required by the FAA is extended by two months.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This directive adopts the FAA’s technical requirements (FAA AD 91-18-10) for new maximum brake wear limits for specified Boeing 767 brake assemblies and applies them to Australian-registered aircraft (Requirement; Applicability). The scope change from the FAA action is temporal: CASA extended the FAA effective date by two months for Australian-registered aircraft, setting the revised effective date as 12 January 1991 (Compliance; Background)."},"complexity_factors":["Narrow applicability limited to Model 767 series with specified brake part numbers (Applicability).","Procedural cross-reference to an external technical document (FAA AD 91-18-10), requiring operators to obtain and follow that document for details (Requirement).","Administrative nuance: revised/extended effective date for Australian-registered aircraft (Compliance).","Operational implications depend on technical measurements and maintenance procedures that are not reproduced in the directive text, increasing practical complexity for implementers who must consult the FAA AD (Requirement)."],"plain_english_summary":"This instrument adopts FAA Airworthiness Directive 91-18-10 for certain brake assemblies on Boeing 767s, imposing lower maximum wear limits and mandating the FAA’s inspection/repair actions. It affects owners, operators and maintenance providers of those 767s, shifting when brakes must be measured, repaired or replaced. The rule (with an Australian effective date of 12 Jan 1991) tightens safety margins after a rejected‑takeoff incident, increasing inspection burden, parts use and maintenance costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific safety issue with specific brake assemblies on a specific aircraft type. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only one substantive requirement: comply with FAA AD 91-18-10","No defined terms section — relies entirely on external FAA document","Single applicability criterion (model series + brake part number)","No conditional logic, exceptions, or nested provisions","Cross-reference to only one external document (the FAA Airworthiness Directive)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for **Boeing 767 aircraft**.\n\n**What it does:**\n- Requires operators to replace or inspect brake assemblies on Boeing 767s that use specific brake part numbers\n- Sets **new, stricter limits** on how worn brakes can be before they must be replaced\n- The new limits are lower than the previous ones — meaning brakes must be replaced **earlier** (with more material remaining)\n\n**Why it matters:**\n- After a runway incident where a plane couldn't stop properly during an aborted takeoff, investigators found the brakes were technically \"legal\" but too worn to handle emergency braking\n- The old wear limits allowed brakes to get too thin to absorb the heat and stress of a high-speed rejection\n- This prevents similar accidents by ensuring brakes have enough capacity to stop the aircraft in an emergency\n\n**Who must comply:**\n- Australian operators of Boeing 767s with the affected brake part numbers\n- Compliance deadline: 12 January 1991 (Australia got two extra months compared to the US FAA requirement)\n\n**Key point:** This doesn't ban the brakes — it just says \"replace them sooner than we used to.\""}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-60-brake-wear-limit","history":"/api/acts/ad-b767-60-brake-wear-limit/history","analysis":"/api/acts/ad-b767-60-brake-wear-limit/analysis","conflicts":"/api/acts/ad-b767-60-brake-wear-limit/conflicts","importantCases":"/api/acts/ad-b767-60-brake-wear-limit/important-cases","documents":"/api/acts/ad-b767-60-brake-wear-limit/documents"}}