{"id":"F2006B03012","name":"AD/B747/110 - Doorstop Support Fitting","slug":"ad-b747-110-doorstop-support-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42371,"registerId":"commonwealth-F2006B03012-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/110 - Doorstop Support Fitting","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/B747/110 Doorstop Support Fitting 6/92\n\nApplicability: Model 747 series, line numbers 001 through 113.\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 92-02-01 Amdt 39- 8137.\n\n \n\nNote: Boeing ASB 747-53A2326 refers.\n\n \n\nCompliance: As specified in the Requirement Document.\n\n \n\nBackground: Reports have been received of cracks in certain doorstop fittings at the forward edge of number 5 main entry doors. This Directive requires on-going repetitive inspections until optional terminating action is instigated.\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 a limited production run of aircraft. It has not expanded beyond its original purpose of ensuring doorstop fitting integrity."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability criterion (line numbers 001-113)","Single technical requirement referencing external FAA document rather than spelling out procedures","No nested conditional logic or exceptions","No internal cross-references to other sections of Australian regulations","Straightforward compliance structure: inspect repeatedly until fixed"],"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:**\nIt requires owners and operators of specific Boeing 747 aircraft (those built early in the production line, specifically serial numbers 001 through 113) to inspect a particular part called the \"doorstop support fitting\" at the forward edge of the number 5 main entry door.\n\n**Why it matters:**\nCracks have been found in these fittings. If left unchecked, these cracks could compromise the structural integrity of the door frame, potentially creating a serious safety risk during flight. The directive mandates **repeated inspections** on an ongoing basis until a permanent fix (\"terminating action\") is installed.\n\n**Who must comply:**\nAnyone operating the affected Boeing 747 models in Australia — typically airlines and cargo operators.\n\n**Key details:**\n- **Compliance method:** Follow the technical requirements set out in a US Federal Aviation Administration (FAA) directive (AD 92-02-01)\n- **Reference document:** Boeing Alert Service Bulletin 747-53A2326 provides the technical instructions\n- **Timeline:** As specified in the FAA document (not stated directly here)"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope remains focused on the identified Boeing 747 line numbers and the specified doorstop support fittings. Its stated aim is to detect and manage reported cracking through repetitive inspections until an optional terminating action is taken. The instrument does not expand or contract that scope within its text; it instead delegates the detailed inspection and terminating-action procedures to the referenced FAA AD and Boeing service bulletin. (Applicability; Requirement; Note; Background)"},"complexity_factors":["Delegation of technical detail to an external document (FAA AD 92-02-01 Amdt 39-8137) rather than including procedures in the directive (Requirement; Compliance)","Reference to a manufacturer service bulletin (Boeing ASB 747-53A2326) that operators must consult for related instructions (Note)","Ongoing, repetitive inspections with an unspecified interval and unspecified terminating action in this text increases operational planning uncertainty (Background; Requirement)","Applicability limited to specific airframe line numbers requires accurate fleet identification (Applicability)","No cost or personnel allocation details in the directive — practical burden rests on operators and their maintenance providers (Applicability; Compliance)"],"plain_english_summary":"What this directive does (mechanically)\n\n- It requires operators of certain Boeing 747 aeroplanes (line numbers 001–113) to carry out recurring inspections of the doorstop support fittings at the forward edge of the number 5 main entry doors. (Applicability; Background; Requirement)\n- The inspections must be performed in accordance with the technical instructions in FAA AD 92-02-01 Amdt 39-8137 (the referenced Requirement Document). The directive remains in force as a repetitive inspection requirement until an optional terminating action is carried out. (Requirement; Compliance)\n- Boeing Service Bulletin ASB 747-53A2326 is identified as a related reference. (Note)\n\nWhy the directive exists (stated purpose)\n\n- The directive records that there have been reports of cracks in certain doorstop fittings at the specified door location. The stated purpose is to detect and manage such cracking through on-going inspections. (Background)\n\nWho is affected and who decides\n\n- Affected parties: operators of Boeing 747 series aeroplanes with line numbers 001 through 113. (Applicability)\n- Decision documents: the Civil Aviation Safety Authority issues this directive but directs operators to follow the FAA Airworthiness Directive (FAA AD 92-02-01 Amdt 39-8137) for the technical steps and compliance timing. Boeing ASB 747-53A2326 is also referenced for technical detail. This means the precise inspection procedures and intervals are set by those referenced documents rather than in the text of this directive. (Requirement; Note; Compliance)\n\nWho pays and what behaviour changes\n\n- Costs fall to the aircraft operators (or their contracted maintenance organisations) who must perform the repetitive inspections and, if chosen, implement the optional terminating action. The directive does not state who funds parts or modification work; it requires compliance with the referenced documents. (Applicability; Requirement; Compliance)\n- Behaviour changes: operators must adopt a recurring inspection programme for the specified fitting until they carry out whatever optional terminating action the Requirement Document allows. That changes maintenance planning from either periodic checks already in place to the specific inspections set out in the FAA AD, and may change resource allocation if an optional terminating modification is chosen. (Requirement; Background)\n\nCosts, incentives and trade-offs (tested against the directive text)\n\n- Direct and recurring cost: the directive's mandatory, ongoing inspections impose an operational and maintenance cost stream on the affected operators until they perform the optional terminating action. The exact inspection method and interval are delegated to the FAA AD (the Requirement Document), so the magnitude of that cost is not stated here. (Requirement; Compliance)\n- Optional terminating action trade-off: the directive allows an optional terminating action that, if implemented, stops the repetitive inspections. That creates a short-run cost (to perform the terminating action) in exchange for eliminating ongoing inspection costs. The directive does not quantify either cost. (Background; Requirement)\n- Implementation risk and compliance burden: the directive delegates technical specifics to an external FAA AD and refers to a Boeing ASB. That delegation concentrates technical discretion in those referenced documents. Operators must obtain and follow the Requirement Document to comply; ambiguity in this directive about exact steps increases reliance on those external texts. (Requirement; Note; Compliance)\n\nEffects on private enterprise and competition (as supported by the text)\n\n- The directive directly affects only operators of the specified 747 line numbers; it does not create new licensing or ownership restrictions. It requires operational compliance (inspections or a terminating modification) that may shift maintenance workload between an operator and its maintenance providers, but the text does not prescribe who must perform the work. (Applicability; Requirement)\n\nConcrete limits of the directive\n\n- Scope is limited to the doorstop support fittings at the forward edge of the number 5 main entry doors on the identified line-numbered 747s. The directive does not impose broader measures beyond those inspections and the optional terminating action described indirectly by the Requirement Document. (Applicability; Background)\n\nImplementation points for operators (practical mechanics)\n\n- Obtain and follow FAA AD 92-02-01 Amdt 39-8137 for the exact inspection procedures and intervals. (Requirement)\n- Refer to Boeing ASB 747-53A2326 for any linked service instructions. (Note)\n- Plan for recurring inspection workload and budgeting until an optional terminating action is completed. (Background; Compliance)\n\nSource citations: Applicability; Requirement; Note; Compliance; Background."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-110-doorstop-support-fitting","history":"/api/acts/ad-b747-110-doorstop-support-fitting/history","analysis":"/api/acts/ad-b747-110-doorstop-support-fitting/analysis","conflicts":"/api/acts/ad-b747-110-doorstop-support-fitting/conflicts","importantCases":"/api/acts/ad-b747-110-doorstop-support-fitting/important-cases","documents":"/api/acts/ad-b747-110-doorstop-support-fitting/documents"}}