{"id":"F2006B03390","name":"AD/B767/35 - Entry/Service Door Acoustic Seal","slug":"ad-b767-35-entry-service-door-acoustic-seal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42931,"registerId":"commonwealth-F2006B03390-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/35 - Entry/Service Door Acoustic Seal","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/B767/35 Entry/Service Door Acoustic Seal 4/90\n\nApplicability: Model 767 Line Position 1 through 244 and Line Position 246 through 262. Requirement:               Action in accordance with Boeing SB 767-25-0123 R1.\n\nNote: FAA AD 90-01-05 refers.\n\n \n\nCompliance: Prior to 15 June 1990.\n\n \n\nBackground:  Country of origin AD. Migration of acoustic seal may result in incomplete arming of emergency evacuation slide. This must be armed for correct slide deployment during an emergency.\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 discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of ensuring emergency slide functionality."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined applicability criteria (line position ranges)","Single compliance action referencing external technical document (Boeing SB)","No nested exceptions or conditional logic","No cross-references to other legislation beyond note about FAA AD","Straightforward cause-and-effect explanation in background"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of specific Boeing 767 aircraft to fix a problem with the acoustic seal around entry and service doors.\n\n**Who it affects:**\nBoeing 767 aircraft with serial numbers (called \"Line Positions\") 1 through 244, and 246 through 262. This excludes Line Position 245 for some reason.\n\n**What the problem is:**\nThe acoustic seal (a rubber or foam seal that reduces noise) can shift or \"migrate\" out of position. If this happens, it may prevent the emergency evacuation slide from being fully \"armed\" (ready to deploy). In an emergency, an unarmed slide won't inflate automatically, potentially trapping passengers inside.\n\n**What must be done:**\nFollow the repair instructions in **Boeing Service Bulletin 767-25-0123 Revision 1** — a technical manual from the manufacturer detailing exactly how to inspect and fix the seal.\n\n**When it had to be done by:**\nBefore 15 June 1990.\n\n**Why it matters:**\nThis is a life-safety issue. Emergency slides must deploy automatically when doors open in an evacuation. A faulty seal could delay or prevent escape during a fire or crash."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope is defined in the text: it applies to specific Boeing 767 line positions and requires the action set out in Boeing SB 767-25-0123 R1 to address acoustic seal migration that can affect slide arming. There is no indication in the provided text that the scope has been broadened or narrowed from its original stated applicability (Applicability; Requirement; Background)."},"complexity_factors":["Narrow, model- and line-position-specific applicability (Applicability)","Mandatory reference to an external manufacturer document (Boeing SB 767-25-0123 R1) rather than detailed procedures in the AD (Requirement)","Single fixed compliance deadline creating scheduling pressure for operators (Compliance)","Safety-critical technical issue (evacuation slide arming) requiring precise workmanship and inspection (Background)","Cross-reference to foreign regulator action (FAA AD) creating reliance on country-of-origin determinations (Note; Background)"],"plain_english_summary":"This AD, issued by CASA, requires selected Boeing 767s (line positions 1–244 and 246–262) to have the entry/service door acoustic seal inspected and corrected exactly per Boeing Service Bulletin 767‑25‑0123 Revision 1 to prevent seal migration that can cause incomplete arming of the emergency evacuation slide.  \n\nAffected operators must complete the work by 15 June 1990 and bear the associated maintenance costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-35-entry-service-door-acoustic-seal","history":"/api/acts/ad-b767-35-entry-service-door-acoustic-seal/history","analysis":"/api/acts/ad-b767-35-entry-service-door-acoustic-seal/analysis","conflicts":"/api/acts/ad-b767-35-entry-service-door-acoustic-seal/conflicts","importantCases":"/api/acts/ad-b767-35-entry-service-door-acoustic-seal/important-cases","documents":"/api/acts/ad-b767-35-entry-service-door-acoustic-seal/documents"}}