{"id":"F2006B03024","name":"AD/B747/123 - Stretched Upper Deck Escape System","slug":"ad-b747-123-stretched-upper-deck-escape-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42383,"registerId":"commonwealth-F2006B03024-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/123 - Stretched Upper Deck Escape 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 747 Series Aeroplanes\n\n \n\nAD/B747/123 Stretched Upper Deck Escape System 5/94\n\nApplicability: Model 747 series aircraft with a stretched upper deck, all line numbers up to and including line number 980.\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 94-01-15 Amdt 39- 8797.\n\n \n\nNote: Boeing ASB 747-25A3056 refers.\n\n \n\nCompliance: Prior to 31 October 1994.\n\n \n\nBackground: The FAA received a report that, during deployment of a stretched upper deck emergency evacuation slide, the slide inflated, but subsequently lost air from one chamber.\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 a specific aircraft configuration. It has not expanded beyond its original purpose of mandating a fix for the stretched upper deck escape slide issue."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 defined applicability criterion (stretched upper deck, line numbers ≤980)","Single requirement referencing external technical document rather than spelling out steps","No nested conditions, exceptions, or cross-references to other legislation","Simple compliance deadline with no alternative methods or phased implementation"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 747 aircraft.\n\n**What it does:**\n- Requires owners and operators of Boeing 747s with a \"stretched upper deck\" (the extended hump on some 747 models) to inspect and fix a problem with the emergency evacuation slide system on that upper deck.\n\n**The safety issue:**\n- The US Federal Aviation Administration (FAA) discovered that during an emergency, the evacuation slide on the stretched upper deck could inflate but then leak air from one of its chambers. A faulty escape slide could trap passengers during an emergency evacuation.\n\n**Who must comply:**\n- Anyone operating Boeing 747 aircraft with stretched upper decks, specifically those built up to line number 980 (roughly early-to-mid production aircraft).\n\n**What they must do:**\n- Follow the technical instructions in the referenced FAA directive (AD 94-01-15) and Boeing Alert Service Bulletin 747-25A3056.\n\n**Deadline:**\n- The fix had to be completed before 31 October 1994.\n\n**Why it matters:**\n- Emergency evacuation systems must work perfectly. This directive prevents a potentially deadly failure where passengers might be unable to escape during an emergency landing or crash."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies only to Model 747 series aeroplanes with a stretched upper deck up to line number 980 (Applicability). It does not expand applicability beyond that defined group and does not add additional subject matter beyond requiring compliance with FAA AD 94-01-15 and referencing Boeing ASB 747-25A3056 (Requirement, Note). Therefore the instrument's scope, as presented in the text, is limited and is not changed from the stated applicability."},"complexity_factors":["References an external technical instrument (FAA AD 94-01-15) for the substantive remedial steps rather than setting them out in full (Requirement).","Refers to a manufacturer service bulletin for related technical information (Boeing ASB 747-25A3056) (Note).","Applicability limited by aircraft model and by line numbers (up to and including line 980), requiring precise fleet identification (Applicability).","A firm compliance deadline is imposed, creating scheduling and operational planning requirements (Compliance).","Safety issue described succinctly but without technical detail (Background), requiring reliance on external technical material for implementation."],"plain_english_summary":"This AD, issued by CASA, mandates that operators of Boeing 747s with a stretched upper deck (line numbers up to 980) carry out the corrective actions required by FAA AD 94-01-15 — referring to Boeing Service Bulletin 747-25A3056 — to fix an upper-deck evacuation slide that was reported to lose air during deployment. Work must be completed by 31 October 1994.\n\nAffected owners/operators are responsible for performing and funding the remedy; the AD delegates the technical details to the FAA AD and Boeing service information."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-123-stretched-upper-deck-escape-system","history":"/api/acts/ad-b747-123-stretched-upper-deck-escape-system/history","analysis":"/api/acts/ad-b747-123-stretched-upper-deck-escape-system/analysis","conflicts":"/api/acts/ad-b747-123-stretched-upper-deck-escape-system/conflicts","importantCases":"/api/acts/ad-b747-123-stretched-upper-deck-escape-system/important-cases","documents":"/api/acts/ad-b747-123-stretched-upper-deck-escape-system/documents"}}