{"id":"F2006B09772","name":"AD/F28/34 - Flap Control System - Automatic Reset Feature - Modification","slug":"ad-f28-34-flap-control-system-automatic-reset-feature-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54670,"registerId":"commonwealth-F2006B09772-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/34 - Flap Control System - Automatic Reset Feature - 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/F28/34 Flap Control System - Automatic Reset Feature - Modification\n\n\n11/76\n\n \n\nApplicability: All models S/Nos. 11003 to 11091 inclusive, 11991 to 11993 inclusive and 11092 to\n\n11098 inclusive.\n\n \n\nDocument: 1. Fokker SB F28/27-112; or\n\n \n\n2. RLD AD A53/76. Compliance: Before 1 December 1977.\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, single-issue airworthiness directive from 1976 with a narrow technical scope (one aircraft type, one specific system modification). It has not expanded beyond its original purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability ranges (serial number blocks)","Simple binary compliance pathway (two acceptable source documents)","Single deadline with no conditional extensions or exceptions","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","No nested conditions or sub-delegations"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Fokker F28 series aeroplanes** to modify the **flap control system** — specifically, to address an **automatic reset feature** that could pose a safety risk.\n\n**Who it affects:**\n- All Fokker F28 aircraft with **serial numbers 11003 to 11091**, **11991 to 11993**, and **11092 to 11098**\n- Aircraft owners, operators, and maintenance organisations responsible for these planes\n\n**What must be done:**\n- Follow the technical instructions in **Fokker Service Bulletin F28/27-112** OR the Dutch aviation authority's directive **RLD AD A53/76**\n- Complete the modification **before 1 December 1977**\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety requirements. Non-compliance means the aircraft cannot legally fly in Australian airspace. This particular directive addresses a potential defect in the flap control system — flaps are crucial for controlling lift during takeoff and landing, so any malfunction could affect flight safety."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope matches its stated purpose: it mandates a modification to the flap control system for the specifically listed Fokker F28 serial numbers, to be done according to the cited technical documents and completed by the specified deadline. There is no indication in the text that the applicability or required work departs from that original intent. (Applicability; Document; Compliance; AD/F28/34)"},"complexity_factors":["Narrow applicability defined by specific serial-number ranges (three ranges listed). (Applicability)","Compliance is governed by one of two external technical documents rather than detailed steps in the directive itself. (Document)","Single fixed compliance deadline (before 1 December 1977) reduces scheduling complexity but is time-bound. (Compliance)","Regulatory authority and mandatory nature are straightforward (Part 39/Civil Aviation Safety Authority). (Commonwealth of Australia; Part 39)","No listed exceptions, alternatives, or phased implementation in the directive increases procedural clarity. (AD/F28/34)"],"plain_english_summary":"AD/F28/34 mandates a modification to the flap control system of specified Fokker F28 aeroplanes so it incorporates an automatic reset feature. It applies to serial numbers 11003–11091, 11991–11993, and 11092–11098; owners/operators must complete the work by 1 December 1977, following Fokker Service Bulletin F28/27‑112 or RLD AD A53/76. The requirement is mandatory under Commonwealth airworthiness authority (Part 39) and is at the operator’s cost."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-34-flap-control-system-automatic-reset-feature-modification","history":"/api/acts/ad-f28-34-flap-control-system-automatic-reset-feature-modification/history","analysis":"/api/acts/ad-f28-34-flap-control-system-automatic-reset-feature-modification/analysis","conflicts":"/api/acts/ad-f28-34-flap-control-system-automatic-reset-feature-modification/conflicts","importantCases":"/api/acts/ad-f28-34-flap-control-system-automatic-reset-feature-modification/important-cases","documents":"/api/acts/ad-f28-34-flap-control-system-automatic-reset-feature-modification/documents"}}