{"id":"F2006B03166","name":"AD/B747/27 - Escape Slide Flapper Valve - Modification","slug":"ad-b747-27-escape-slide-flapper-valve-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42538,"registerId":"commonwealth-F2006B03166-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/27 - Escape Slide Flapper Valve - Modification","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/B747/27 Escape Slide Flapper Valve - Modification 2/81\n\nApplicability: All models 747 with B.F. Goodrich escape slides and turbo fans identified in B.F. Goodrich SB No. 25-060 dated 14 July 1980.\n\n \n\nDocuments: 1. FAA AD 80-20-02, Amendment 39-3928; or\n\n \n\n2. Boeing SB 747-25-2543; OR 3. B.F. Goodrich SB 25-060.\n\n \n\nCompliance: Before 1 January 1981.\n\n \n\nBackground: Some escape slides on overseas aeroplanes have failed to inflate correctly during emergency test inflation.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated safety purpose: it targets Boeing 747 aeroplanes fitted with the specific B.F. Goodrich escape slides/turbo fans identified in the referenced B.F. Goodrich service bulletin and mandates a modification to the flapper valve to address inflation failures (see \"Applicability\" and \"Background\"). There is no material indication in the text supplied that the scope deviates from that original intent."},"complexity_factors":["Narrow technical scope limited to Boeing 747s with B.F. Goodrich slides identified in B.F. Goodrich SB No. 25-060 (Applicability)","External technical documents must be obtained and followed (FAA AD 80-20-02, Boeing SB 747-25-2543, or B.F. Goodrich SB 25-060) (Documents)","Fixed compliance deadline creates scheduling pressure for operators (Compliance)","Safety-critical, technical modification requiring qualified maintenance personnel and possible parts procurement","Multiple alternative compliance documents reduce regulatory discretion but increase need to choose appropriate procedure"],"plain_english_summary":"Requires a hardware modification to the escape‑slide flapper valve on Boeing 747s fitted with B.F. Goodrich slides/turbo fans, to be carried out using one of three referenced service documents and completed before 1 January 1981. It affects aircraft owners/operators, who must schedule and pay for the work; the change is mandated to address reported slide inflation failures and improve emergency-evacuation reliability."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive focused on a specific mechanical defect in a specific aircraft component. It has not expanded beyond its original purpose of mandating a safety modification to B.F. Goodrich escape slides on Boeing 747 aircraft."},"complexity_factors":["Very short document (approximately 200 words)","Only 4 defined elements: applicability criteria, three reference documents, single compliance date, and brief background","No nested conditional logic or exceptions","No cross-referencing to other legislation beyond the parent Civil Aviation Regulations 1998","Straightforward command structure: 'applies to X, do Y by Z date, follow documents A, B, or C'","Single-layer regulatory instrument (Airworthiness Directive) with clear binary compliance (compliant/non-compliant)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nOrders airlines and aircraft operators to modify the escape slides on certain Boeing 747 aircraft. Specifically, it requires fixing a problem with \"flapper valves\" (small mechanical components that control airflow) in the emergency escape slides made by B.F. Goodrich.\n\n**Who it affects:**\nAnyone operating Boeing 747 aircraft equipped with B.F. Goodrich escape slides and turbo fans — specifically those models identified in a technical bulletin (Service Bulletin No. 25-060) from July 1980.\n\n**Why it matters:**\nEscape slides are the inflatable chutes passengers use to exit during an emergency. The background notes that some slides on overseas aircraft **failed to inflate properly during emergency tests** — a potentially deadly defect if a real evacuation were needed. This directive forces operators to fix the problem before a deadline to ensure passenger safety.\n\n**Key details:**\n- **Deadline:** The modification had to be completed before 1 January 1981\n- **How to comply:** Follow one of three technical documents listed (either the FAA's directive, Boeing's service bulletin, or B.F. Goodrich's service bulletin)\n- **Legal force:** This is not optional — under the Civil Aviation Regulations, compliance is mandatory"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-27-escape-slide-flapper-valve-modification","history":"/api/acts/ad-b747-27-escape-slide-flapper-valve-modification/history","analysis":"/api/acts/ad-b747-27-escape-slide-flapper-valve-modification/analysis","conflicts":"/api/acts/ad-b747-27-escape-slide-flapper-valve-modification/conflicts","importantCases":"/api/acts/ad-b747-27-escape-slide-flapper-valve-modification/important-cases","documents":"/api/acts/ad-b747-27-escape-slide-flapper-valve-modification/documents"}}