{"id":"F2006B09769","name":"AD/F28/31 - Anti-Skid System - Modification","slug":"ad-f28-31-anti-skid-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54660,"registerId":"commonwealth-F2006B09769-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/31 - Anti-Skid System - 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)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/31 Anti-Skid System - Modification 5/76\n\nApplicability: All models with S/Nos. 11003 to 11101 and 11991 to 11993. Document:  1. Fokker SB No. F28/32-117; or\n\n2. RLD AD A26/76. Compliance: Before 1 July 1976.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument's scope is confined to a specific set of Fokker F28 aeroplanes (defined by serial numbers) and a single technical requirement (anti-skid system modification), with compliance to be achieved by following one of two referenced technical documents. Nothing in the text indicates an expansion or contraction of that scope beyond these stated limits."},"complexity_factors":["Narrow, clearly defined applicability by serial number reduces legal scope complexity (Applicability).","Single, well-specified action (modification of anti-skid system) keeps substantive requirements simple (title and Document clause).","Mandatory compliance date creates a concrete deadline and associated operational complexity (Compliance).","Technical implementation details are delegated to external documents (Fokker SB No. F28/32-117 or RLD AD A26/76), which increases practical complexity for implementers who must obtain and follow those documents (Document).","Compliance imposes logistical burdens (parts, labour, downtime) on a concentrated set of operators/owners (Applicability and Compliance)."],"plain_english_summary":"This Airworthiness Directive mandates a modification to the anti‑skid system on Fokker F28 aeroplanes with serial numbers 11003–11101 and 11991–11993, to be done per Fokker SB No. F28/32‑117 or RLD AD A26/76. The work must be completed before 1 July 1976, leaving the owner/operator responsible for sourcing the document and carrying out the modification and costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1976 with a specific technical scope (anti-skid modification for defined aircraft). It has not expanded beyond its original purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined elements: applicability (serial number ranges), document references (2 options), and compliance deadline","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","No conditional logic or exceptions — straightforward mandatory requirement","Single operational requirement: modify anti-skid system before specified date"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Fokker F28 series aircraft to modify their **anti-skid braking systems** (the systems that prevent wheels from locking up during landing). The modification must be done according to either:\n- Fokker Service Bulletin No. F28/32-117 (the manufacturer's official technical instruction), OR\n- RLD AD A26/76 (a Dutch aviation safety directive — RLD is the Netherlands' former aviation authority)\n\n**Who it affects:** This applies to specific Fokker F28 aircraft with serial numbers 11003 to 11101 and 11991 to 11993.\n\n**Why it matters:** Anti-skid systems are critical for safe landings, especially in wet or slippery conditions. This directive was issued to fix a known safety problem with these systems in certain Fokker aircraft. The deadline for compliance was 1 July 1976.\n\n**Key point:** Airworthiness Directives are legally binding. Operating an aircraft without complying with an AD is illegal and unsafe."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-31-anti-skid-system-modification","history":"/api/acts/ad-f28-31-anti-skid-system-modification/history","analysis":"/api/acts/ad-f28-31-anti-skid-system-modification/analysis","conflicts":"/api/acts/ad-f28-31-anti-skid-system-modification/conflicts","importantCases":"/api/acts/ad-f28-31-anti-skid-system-modification/important-cases","documents":"/api/acts/ad-f28-31-anti-skid-system-modification/documents"}}