{"id":"F2006B03227","name":"AD/B747/47 - Upper Deck Type A Door - Power and Slide Deployment Mechanism Fasteners","slug":"ad-b747-47-upper-deck-type-a-door-power-and-slide-deployment-mechanism-fasteners","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42625,"registerId":"commonwealth-F2006B03227-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/47 - Upper Deck Type A Door - Power and Slide Deployment Mechanism Fasteners","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/B747/47 Upper Deck Type A Door - Power and Slide\n\nDeployment Mechanism Fasteners\n\nApplicability: All aircraft listed in the Requirement Document. Requirement: Action in accordance with Boeing SB 747-52A2198.\n\nNote: FAA AD 86-02-03 refers.\n\n \n\nCompliance: Prior to 31 March 1986.\n\n\n4/86\n\nDM\n\n \n\nBackground: Boeing Co have reported that a significant percentage of self locking nuts P/N BACN10JC6CM in stock do not meet specified locking torque requirements.\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, time-bound safety directive addressing a specific manufacturing defect in a specific aircraft component. It has not expanded beyond its original narrow technical scope."},"complexity_factors":["Extremely short document — approximately 150 words of substantive content","Only one defined applicability reference ('All aircraft listed in the Requirement Document')","Single compliance action with external reference to Boeing Service Bulletin (no detailed technical procedures in the instrument itself)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward command structure: applicability → requirement → compliance date → background","Background section provides plain English explanation of the safety issue"],"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 airlines and aircraft operators to inspect and fix a specific mechanical problem on Boeing 747 aeroplanes. The issue involves **self-locking nuts** (fasteners that prevent bolts from loosening due to vibration) used in the power and slide deployment mechanisms for the upper deck Type A doors — that's the emergency exit door on the upper level of a jumbo jet, where the slide inflates for emergency evacuation.\n\n**The problem:**\nBoeing discovered that many of these nuts in their stock didn't meet the required \"locking torque\" — meaning they might not grip tightly enough and could loosen over time. If these fasteners fail, the emergency slide might not deploy properly during an evacuation, or the door mechanism could malfunction.\n\n**Who it affects:**\nOwners and operators of Boeing 747 series aircraft registered in Australia.\n\n**What they must do:**\nFollow the instructions in **Boeing Service Bulletin 747-52A2198** — a technical repair notice from the manufacturer — to replace or inspect the faulty fasteners.\n\n**When:**\nBefore 31 March 1986.\n\n**Why it matters:**\nThis is about preventing catastrophic failure of emergency evacuation systems. If the slide doesn't deploy because a nut worked loose, passengers could be trapped during an emergency. The directive references a corresponding US Federal Aviation Administration (FAA) order (AD 86-02-03), showing this was a coordinated international safety response."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope as presented is consistent with the stated objective in the Background: to address self-locking nuts (P/N BACN10JC6CM) that may not meet locking-torque requirements on upper-deck Type A door deployment hardware. The AD applies to the aircraft listed in the Requirement Document and mandates the actions in Boeing SB 747-52A2198 with a specified compliance date; the text does not indicate any expansion or narrowing of that scope relative to the stated issue."},"complexity_factors":["Reference to an external technical document (Boeing SB 747-52A2198) to define required work rather than listing steps in the AD (Requirement)","Applicability tied to a separate Requirement Document which is not reproduced here, so exact affected serial numbers are not visible in the AD text (Applicability)","Technical subject-matter (fastener torque and door/slide deployment mechanism) requiring specialised maintenance capability","A firm compliance deadline that shortens planning time for operators (Compliance)","Cross-reference to an FAA AD (Note) creating potential need to reconcile multiple regulatory documents"],"plain_english_summary":"This AD requires operators of the specified Boeing 747s to comply with Boeing Service Bulletin 747-52A2198 to inspect and, if necessary, re-torque or replace upper-deck Type A door power-and-slide fasteners (notably self‑locking nuts P/N BACN10JC6CM) after Boeing found torque non‑conformance in stocked parts. Affected operators must complete the SB actions by 31 March 1986 and bear related costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-47-upper-deck-type-a-door-power-and-slide-deployment-mechanism-fasteners","history":"/api/acts/ad-b747-47-upper-deck-type-a-door-power-and-slide-deployment-mechanism-fasteners/history","analysis":"/api/acts/ad-b747-47-upper-deck-type-a-door-power-and-slide-deployment-mechanism-fasteners/analysis","conflicts":"/api/acts/ad-b747-47-upper-deck-type-a-door-power-and-slide-deployment-mechanism-fasteners/conflicts","importantCases":"/api/acts/ad-b747-47-upper-deck-type-a-door-power-and-slide-deployment-mechanism-fasteners/important-cases","documents":"/api/acts/ad-b747-47-upper-deck-type-a-door-power-and-slide-deployment-mechanism-fasteners/documents"}}