{"id":"F2006B03009","name":"AD/B747/108 - Girt Bar Floor Brackets","slug":"ad-b747-108-girt-bar-floor-brackets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42368,"registerId":"commonwealth-F2006B03009-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/108 - Girt Bar Floor Brackets","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/B747/108 Girt Bar Floor Brackets 5/92\n\nApplicability: Model 747 series, listed in Being SB 747-25-2754.\n\n \n\nRequirement: Replace the girt bar floor brackets with modified brackets, in accordance with Boeing SB 747-25-2754.\n\n \n\nNote: FAA AD 92-02-17 Amdt 39-8154 refers.\n\n \n\nCompliance: Prior to 2 March 1994.\n\n \n\nBackground:  This Directive requires replacement of the main deck passenger door girt bar floor brackets with modified brackets. Reports were received of girt bar end fittings not fitting properly or fully engaged with the floor brackets.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument itself sets a clear, limited scope: it applies to Model 747 series aeroplanes listed in Boeing SB 747-25-2754 and requires replacement of specified brackets by a stated date. The text contains no indication that the scope has been broadened or narrowed from an earlier version or original intent."},"complexity_factors":["Narrow technical focus: single component (girt bar floor brackets) on a defined aircraft family (Model 747 series). (Applicability; Requirement)","Clear prescriptive action: mandated replacement per a specified Boeing service bulletin. (Requirement)","Fixed compliance deadline that is straightforward to determine. (Compliance)","Dependence on an external technical document (Boeing SB 747-25-2754) and cross-reference to an FAA AD increases operational steps but not legal complexity. (Requirement; Note)","Implementation logistics (sourcing parts, scheduling maintenance, aircraft downtime) add practical complexity for operators rather than legal complexity. (Requirement; Compliance)"],"plain_english_summary":"What this directive does (mechanics)\n\n- Requires operators of certain Boeing 747 aeroplanes to replace the main-deck passenger door girt bar floor brackets with modified brackets. The replacement must follow the instructions in Boeing Service Bulletin (SB) 747-25-2754. (Requirement)\n- Applies to Model 747 series aeroplanes listed in Boeing SB 747-25-2754. (Applicability)\n- The replacement must be completed on affected aircraft before 2 March 1994. (Compliance)\n\nWhy the directive was issued (stated reason)\n\n- The directive states it was issued because there were reports that girt bar end fittings did not fit properly or were not fully engaged with the floor brackets. The replacement is presented as the corrective action. (Background)\n- The directive cross-references a United States FAA airworthiness directive (FAA AD 92-02-17 Amdt 39-8154). (Note)\n\nWho pays and who decides\n\n- Aircraft operators or owners of the affected 747s are the parties required to carry out the replacement and therefore bear the direct costs of parts, labour and aircraft downtime. (Applicability; Requirement; Compliance)\n- The Civil Aviation Safety Authority issued the directive under the Schedule of Airworthiness Directives. The technical method to comply is set by referencing Boeing SB 747-25-2754; the FAA AD is referenced as related guidance. (header; Requirement; Note)\n\nIncentives, trade-offs and practical effects\n\n- Incentive: Operators must comply to meet the regulatory requirement and to address the reported fitment problem; non-compliance would leave an aircraft out of regulatory conformity. (Compliance; Background)\n- Direct costs: purchasing modified brackets, arranging maintenance work, and aircraft downtime until installation is complete. (Requirement; Compliance)\n- Opportunity cost: resources spent on this replacement (parts, labour, hangar time) cannot be used for other maintenance or operations during the same period. (Requirement; Compliance)\n- Implementation risks and compliance burden: locating the specified replacement parts and scheduling the modification within the required timeframe may impose operational disruption; work must be done in accordance with the Boeing service bulletin referenced. The directive does not detail alternative methods of compliance or exemptions. (Requirement; Compliance)\n- Effect on private choice and operations: Operators must alter maintenance and scheduling decisions to meet the compliance deadline; they can decide where and when to perform the work so long as it follows the referenced service bulletin and is completed by the deadline. (Requirement; Compliance)\n\nConcentrated benefits and diffuse costs (mechanical framing)\n\n- Beneficiaries (concentrated): aircraft passengers and crew on affected aircraft gain from the corrected bracket fit in the sense of addressing the reported mechanical issue; the benefit accrues when the bracket functions correctly. (Background)\n- Those who bear the costs (diffuse in industry terms): each affected aircraft operator bears the specific costs of replacement for their fleet members. The directive does not provide funding or compensation. (Requirement; Compliance)\n\nLimitations of the instrument as presented\n\n- The directive prescribes the corrective action and deadline but does not set out detailed implementation steps beyond referring to Boeing SB 747-25-2754, nor does it state alternative compliance pathways, cost recovery, or inspection thresholds in the text reproduced here. (Requirement; Note)\n\nKey source citations: Applicability; Requirement; Compliance; Background; Note."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on girt bar floor bracket replacement. It has not expanded beyond its original narrow technical scope."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (the Boeing Service Bulletin)","No cross-references to other legislation or regulations beyond a single note about the FAA equivalent","Single, unambiguous requirement with clear compliance deadline","No conditional logic, exceptions, or nested provisions","Straightforward applicability criteria (specific aircraft model series)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for **Boeing 747 aircraft**.\n\n**What it does:**\n- Requires airlines and aircraft operators to replace specific floor brackets on the main deck passenger doors of Boeing 747 planes\n- These brackets are called \"girt bar floor brackets\" — they help secure the inflatable emergency escape slides to the aircraft floor\n\n**Why it matters:**\n- The original brackets weren't working properly — reports showed the girt bar fittings weren't engaging fully with the floor brackets\n- If these brackets fail during an emergency evacuation, passengers might not be able to deploy the escape slides quickly and safely\n- This is a critical safety fix to ensure emergency exits work as designed\n\n**Who must comply:**\n- Operators of Boeing 747 series aircraft listed in Boeing Service Bulletin 747-25-2754\n- Compliance was required before 2 March 1994 (this is a historical directive from 1992)\n\n**What operators had to do:**\n- Replace the old brackets with modified versions following Boeing's specific technical instructions (Service Bulletin 747-25-2754)\n\nThis directive references a corresponding US Federal Aviation Administration (FAA) order (AD 92-02-17), showing how aviation safety standards are often harmonised across countries."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-108-girt-bar-floor-brackets","history":"/api/acts/ad-b747-108-girt-bar-floor-brackets/history","analysis":"/api/acts/ad-b747-108-girt-bar-floor-brackets/analysis","conflicts":"/api/acts/ad-b747-108-girt-bar-floor-brackets/conflicts","importantCases":"/api/acts/ad-b747-108-girt-bar-floor-brackets/important-cases","documents":"/api/acts/ad-b747-108-girt-bar-floor-brackets/documents"}}