{"id":"F2006B03433","name":"AD/B767/79 - Thrust Reverser Control System","slug":"ad-b767-79-thrust-reverser-control-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42981,"registerId":"commonwealth-F2006B03433-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/79 - Thrust Reverser Control System","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/B767/79 Thrust Reverser Control System 10/94\n\nApplicability: All Boeing 767 series aircraft equipped with Pratt and Whitney PW4000 series engines.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 94-12-10. Compliance:              Unless previously accomplished, as specified in the Requirement Document, effective\n\n15 September 1994.\n\n \n\nBackground: This AD is issued to ensure the integrity of the fail safe features of the thrust reverser system to prevent inadvertent deployment of a thrust reverser in flight.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"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 a specific aircraft/engine combination. It has not expanded beyond its original purpose of ensuring thrust reverser system integrity."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies entirely on external FAA document for technical requirements","No conditional logic or nested exceptions within the text itself","Simple structure: applicability, requirement, compliance date, background","Single cross-reference to external FAA AD 94-12-10 (adoption by reference)","No internal cross-referencing between sections"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners and operators of **Boeing 767 aircraft with Pratt & Whitney PW4000 engines** to carry out specific safety modifications or inspections.\n- The technical details of what must be done are contained in a US Federal Aviation Administration (FAA) directive (AD 94-12-10), which this Australian directive adopts by reference.\n\n**Who it affects:**\n- Airlines and operators flying Boeing 767s with these specific engines in Australia.\n- Maintenance organisations servicing these aircraft.\n\n**Why it matters:**\n- The directive addresses a critical safety flaw in the **thrust reverser control system** — the mechanism that helps slow the aircraft after landing by redirecting engine thrust forward.\n- Without this fix, there's a risk that a thrust reverser could accidentally deploy **during flight**, which could cause loss of control or a crash.\n- The \"fail safe features\" mentioned are backup safety mechanisms designed to prevent exactly this kind of dangerous malfunction.\n\n**Key deadline:**\n- Compliance was required by **15 September 1994** (unless already done)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope aligns with the stated purpose in the source text: it applies to all Boeing 767 series aeroplanes equipped with Pratt & Whitney PW4000 engines and requires compliance with the FAA-prescribed technical actions to ensure thrust reverser fail-safe integrity and prevent inadvertent in-flight deployment. The instrument does not extend beyond that applicability or purpose in the text provided."},"complexity_factors":["The AD is short and references an external technical document (FAA AD 94-12-10) rather than repeating technical steps, which reduces textual complexity but shifts complexity to the referenced document.","Technical subject matter (thrust reverser fail-safe systems) requires specialist maintenance and engineering expertise to interpret and implement.","Clear, limited applicability (only B767 with PW4000 engines) narrows scope and stakeholders, lowering administrative complexity.","Compliance timing is fixed (effective date specified) but the AD does not detail timelines, acceptable deviation processes or alternative methods, leaving some interpretative work to regulators/operators.","Cross-jurisdictional reliance on FAA material introduces procedural complexity for Australian approval and oversight of the foreign-origin technical requirements."],"plain_english_summary":"This AD requires owners/operators of Boeing 767 aeroplanes fitted with Pratt & Whitney PW4000 engines to carry out the technical actions in FAA AD 94-12-10, effective 15 September 1994 (unless already completed).  \n\nIt aims to ensure thrust‑reverser fail‑safe integrity to prevent inadvertent in‑flight deployment. Compliance (inspections/modifications, parts, labour, downtime) is the operators' responsibility and enforced by CASA under the Civil Aviation Regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-79-thrust-reverser-control-system","history":"/api/acts/ad-b767-79-thrust-reverser-control-system/history","analysis":"/api/acts/ad-b767-79-thrust-reverser-control-system/analysis","conflicts":"/api/acts/ad-b767-79-thrust-reverser-control-system/conflicts","importantCases":"/api/acts/ad-b767-79-thrust-reverser-control-system/important-cases","documents":"/api/acts/ad-b767-79-thrust-reverser-control-system/documents"}}