{"id":"F2006B03435","name":"AD/B767/80 - Thrust Reverser System Flow Restrictors","slug":"ad-b767-80-thrust-reverser-system-flow-restrictors","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42988,"registerId":"commonwealth-F2006B03435-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/80 - Thrust Reverser System Flow Restrictors","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/B767/80 Thrust Reverser System Flow Restrictors 11/94\n\nApplicability: All Boeing 767 series aircraft equipped with Pratt and Whitney JT9D-7R4 or General Electric CF6-80A series engines.\n\nRequirement: Replace the existing thrust reverser system flow restrictor devices with check valve restrictors in accordance with Boeing Alert Service Bulletin 767-78-0064 for aircraft equipped with CF6-80A series engines or Alert Service Bulletin B767-78-0065 for aircraft equipped with P&W JT9D-7R4 series engines.\n\nNote: FAA AD 94-14-01 also refers.\n\nCompliance: Unless previously accomplished, no later than 31 January 1996.\n\nBackground: This AD is issued following reports of leakage across the actuator piston seals which may result in an inadvertent deployment of a thrust reverser in flight and subsequent reduced controllability of the aircraft.","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 single specific purpose. It has not expanded beyond its original intent of mandating a specific hardware replacement to address a known safety defect."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability criteria (aircraft model and engine types)","Single, clear compliance action with specific technical references (Boeing Service Bulletins)","No nested conditions or exceptions","Straightforward deadline with single exemption (\"unless previously accomplished\")","Minimal cross-referencing (only one reference to corresponding FAA directive)"],"plain_english_summary":"This is a **safety order** (called an \"Airworthiness Directive\") issued by Australia's aviation safety regulator for **Boeing 767 aircraft**.\n\n**What it does:**\n- Requires airlines and aircraft owners to **replace specific parts** in the thrust reverser systems of certain Boeing 767 planes.\n- The parts being replaced are \"flow restrictor devices\" — these control how hydraulic fluid moves in the system that operates the thrust reversers (the panels on jet engines that help slow the plane down after landing).\n\n**Who it affects:**\n- All Boeing 767 aircraft fitted with either **Pratt & Whitney JT9D-7R4** or **General Electric CF6-80A** engines.\n- Aircraft operators, maintenance crews, and owners of these specific planes.\n\n**Why it matters:**\n- There were reports of **hydraulic fluid leaking** past seals in the thrust reverser actuators (the mechanical components that move the reversers).\n- This leak could cause a thrust reverser to **accidentally deploy during flight** — which would seriously affect the pilot's ability to control the aircraft.\n- The fix had to be completed by **31 January 1996** unless already done.\n\n**In short:** This is a mandatory safety fix to prevent a potentially catastrophic mechanical failure on specific Boeing 767 aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive does not expand the set of affected aircraft beyond those listed (Boeing 767 with JT9D-7R4 or CF6-80A engines) and imposes a single, one-off hardware replacement requirement to address the reported leakage risk. It therefore implements a targeted corrective measure described in the Background without extending ongoing obligations or widening applicability. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Applicability limited to a specific airplane model with two distinct engine series, requiring different service bulletins (Applicability; Requirement).","Mandated compliance with manufacturer-issued Alert Service Bulletins rather than bespoke regulatory technical instructions (Requirement).","Fixed compliance deadline requiring operators to manage parts procurement and maintenance scheduling (Compliance).","Safety-critical mechanical replacement that requires correct installation and quality control (Background; Requirement).","Cross-reference to a corresponding FAA AD, implying multi-jurisdictional alignment for operators subject to both regulators (Note)."],"plain_english_summary":"The Civil Aviation Safety Authority requires operators of Boeing 767s fitted with Pratt & Whitney JT9D‑7R4 or GE CF6‑80A engines to replace thrust reverser flow restrictors with check‑valve restrictors per the relevant Boeing Alert Service Bulletin, with a compliance deadline of 31 January 1996. The mandate (borne by operators) aims to eliminate seal‑leakage that could allow in‑flight reverser deployment; a matching FAA AD exists."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-80-thrust-reverser-system-flow-restrictors","history":"/api/acts/ad-b767-80-thrust-reverser-system-flow-restrictors/history","analysis":"/api/acts/ad-b767-80-thrust-reverser-system-flow-restrictors/analysis","conflicts":"/api/acts/ad-b767-80-thrust-reverser-system-flow-restrictors/conflicts","importantCases":"/api/acts/ad-b767-80-thrust-reverser-system-flow-restrictors/important-cases","documents":"/api/acts/ad-b767-80-thrust-reverser-system-flow-restrictors/documents"}}