{"id":"F2006B03391","name":"AD/B767/36 Amdt 1 - High Lift System","slug":"ad-b767-36-amdt-1-high-lift-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42932,"registerId":"commonwealth-F2006B03391-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/36 Amdt 1 - High Lift System","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/B767/36\n\nAmdt 1\n\n  \nHigh Lift System 4/94\n\nApplicability: All model 767 series aeroplanes with line position 001 through 402 inclusive. Requirement: Action in accordance with Boeing SB 767-27A0094 Revision 4.\n\nNote: FAA AD 93-19-05 amdt 39-8703 supersedes FAA AD 89-26-04 amdt 39-6423.\n\nCompliance: As specified in the requirement document.\n\nBackground: A report of an uncommanded slat extension during cruise, and several instances of an inoperative trailing edge flap by-pass motor have prompted the issue of this Airworthiness Directive; which requires regular inspections of the LE slat shutoff valve, the LE slat long term shutoff control, the inboard and outboard LE slat drive mechanical rigging and the TE flap by-pass valve motor.\n\nThis revision raised in sequence to specify the aircraft S/N range, to amend the FAA AD reference and to update the requirement document reference.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment narrows and clarifies scope by specifying the line position (serial) range of affected aircraft (line positions 001–402), updates the referenced FAA AD, and updates the requirement document to Boeing SB 767-27A0094 Revision 4. The substance of the required inspections remains those listed in the requirement document; the amendment is a clarification and administrative update to applicability and references (final revision paragraph; Note; Requirement; Applicability)."},"complexity_factors":["Cross-reference to an external technical document (Boeing SB 767-27A0094 Rev 4) rather than listing procedures in the AD itself (Requirement; Compliance).","Limited, specific applicability by line position (001–402) requires checking serial/line numbers to determine if an aeroplane is covered (Applicability).","Technical nature of required inspections (LE slat shutoff valve, LE shutoff control, inboard/outboard slat drive rigging, TE flap by‑pass motor) requiring qualified maintenance personnel and access to detailed SB procedures (Background; Requirement).","Compliance timing and exact tasks are delegated to the service bulletin, so regulatory compliance depends on obtaining and following that external document (Requirement; Compliance).","Coordination with FAA ADs and amendment history means operators must track both CASA and FAA references for the complete compliance picture (Note; final revision paragraph)."],"plain_english_summary":"This AD requires operators of Boeing 767s (line positions 001–402) to carry out inspections and any corrective actions per Boeing Service Bulletin 767‑27A0094 Revision 4, targeting LE slat shutoff/control and rigging and the TE flap by‑pass valve motor. CASA makes compliance mandatory (operators pay for and arrange work); the action responds to uncommanded slat extension and TE by‑pass failures and aligns with FAA guidance. The AD enforces the SB as the compliance document, creating a procedural and cost burden for affected operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: addressing specific mechanical defects in the Boeing 767 High Lift System. The changes are purely administrative — clarifying which aircraft are affected and updating document references — without expanding the substantive safety requirements or adding new systems to the directive."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (line position = serial number)","Single, unambiguous compliance requirement (follow the Boeing service bulletin)","No nested exceptions or conditional logic","Minimal cross-referencing (only to FAA AD and Boeing SB)","Clear applicability statement with explicit serial number range"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on certain aircraft.\n\n**What it does:**\n- **Targets:** All Boeing 767 aeroplanes with serial numbers (line positions) 001 through 402\n- **Requires:** Airlines and aircraft operators to follow Boeing Service Bulletin 767-27A0094 Revision 4\n- **Addresses:** Safety problems with the \"High Lift System\" — the parts of the wing that extend during takeoff and landing (leading edge slats and trailing edge flaps)\n\n**Why it matters:**\n- **The safety risks:** \n  - Slats (front wing extensions) extending unexpectedly during cruise flight — dangerous at high altitude\n  - Flap motors failing, which could affect landing performance\n- **The fix:** Regular inspections of specific valves, controls, and mechanical rigging to prevent these failures\n\n**What changed in this version (Amendment 1):**\n- Narrowed down exactly which aircraft are affected (specified the serial number range)\n- Updated references to the equivalent US Federal Aviation Administration (FAA) directive\n- Updated to the latest Boeing service bulletin (Revision 4)\n\n**Who must comply:** Aircraft operators, maintenance organisations, and engineers responsible for Boeing 767s in the specified range. Non-compliance means the aircraft cannot legally fly in Australian airspace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-36-amdt-1-high-lift-system","history":"/api/acts/ad-b767-36-amdt-1-high-lift-system/history","analysis":"/api/acts/ad-b767-36-amdt-1-high-lift-system/analysis","conflicts":"/api/acts/ad-b767-36-amdt-1-high-lift-system/conflicts","importantCases":"/api/acts/ad-b767-36-amdt-1-high-lift-system/important-cases","documents":"/api/acts/ad-b767-36-amdt-1-high-lift-system/documents"}}