{"id":"F2006B09659","name":"AD/F100/58 - Engine- Operating Limits and Warnings","slug":"ad-f100-58-engine-operating-limits-and-warnings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115782,"registerId":"commonwealth-F2006B09659-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nFokker F100 (F28 Mk 100) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/F100/58 Engine- Operating Limits and ","sectionType":"part","heading":"AD/F100/58 Engine- Operating Limits and Warnings 2/2003","content":"# AD/F100/58 Engine- Operating Limits and Warnings 2/2003\n\nApplicability: All Fokker 100 (F28 Mk 100) Series aeroplanes with Rolls Royce Tay 650-15 engines installed.\n\nRequirement: Action in accordance with Netherlands AD ( BLA) 2002-119.\n\nNote: Netherlands AD (BLA). 2002-119 refers.\n\nCompliance: As detailed in the requirement document with a revised effective date of 20 February 2003.\n\nThis Airworthiness Directive becomes effective on 20 February 2003.\n\nBackground: Rolls Royce TAY engine as installed in Fokker 100 aircraft has low fan flutter margin and can result in fan blade failures when operated under certain speed ranges. This directive mandates installation of modified warning systems and introduces new engine operating limits and maintenance requirements. These are in addition to those mandated per AD/TAY/2 ( BLA 1997-119/2) and AD/F100/50 (BLA 2002-063).\n\n![Signature of Neville Probert, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nNeville James Probert\n\nDelegate of the Civil Aviation Safety Authority 9 January 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 29 January 2003.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific technical safety issue (fan flutter margin in a particular engine type) for a specific aircraft model. The reference to previous ADs (AD/TAY/2 and AD/F100/50) shows cumulative safety layering rather than scope creep — each AD addresses related but distinct aspects of the same underlying engine concern."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (the Netherlands AD BLA 2002-119, which is incorporated by reference rather than reproduced)","Simple conditional structure: single applicability criterion (aircraft type + engine type)","No nested exceptions or complex logical operators","Heavy reliance on external document (Netherlands AD) for actual technical requirements — the Australian AD essentially just 'points to' the Dutch rules","Clear, linear structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This AD mandates safety actions for Fokker 100 aircraft with Rolls‑Royce Tay 650‑15 engines after discovery of fan‑blade flutter that can cause blade failure and catastrophic engine loss. Operators must install upgraded warning systems and follow new operating limits and maintenance rules required by the directive.\n\nIt affects airlines and maintenance crews; compliance has been legally required since 20 February 2003 and builds on prior AD/TAY/2 and AD/F100/50."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The AD expands obligations beyond earlier directives: it mandates installation of modified warning systems and introduces new operating limits and maintenance requirements 'in addition to those mandated per AD/TAY/2 and AD/F100/50' (Background). The change increases the substantive requirements operators must follow while retaining the same narrow aircraft/engine applicability (Applicability; Requirement; Background)."},"complexity_factors":["Cross-reference to an external mandatory document: compliance is 'in accordance with Netherlands AD (BLA) 2002-119' so the AD depends on an external instrument for substantive instructions (Requirement).","Layering with prior directives: the AD adds requirements 'in addition to' AD/TAY/2 and AD/F100/50, creating cumulative obligations operators must reconcile (Background).","Technical specificity: the unsafe condition arises from 'low fan flutter margin' and possible 'fan blade failures', implying technical inspections, engineering judgement and specialized maintenance work (Background).","Narrow applicability: applies only to Fokker 100 (F28 Mk 100) aeroplanes with Rolls Royce Tay 650-15 engines, concentrating compliance obligations on a specific operator subset (Applicability).","Fixed compliance timing: the instrument specifies an effective/compliance date (20 February 2003), which creates a hard deadline for affected parties (Compliance).","Regulatory authority and discretion: issued under subregulation 39.1(1) of CAR 1998 by a CASA delegate, reflecting delegated decision-making power to mandate corrective action (preamble/signature).","Implementation burden: mandates installation of modified warning systems and new operating limits and maintenance requirements, which will involve procurement, engineering work and ongoing procedural changes (Requirement; Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of Fokker 100 (F28 Mk 100) aircraft fitted with Rolls‑Royce Tay 650‑15 engines to install modified engine warning systems and to follow new engine operating limits and maintenance requirements (Applicability; Requirement; Background). It responds to a low fan‑flutter margin that can cause fan‑blade failures and is mandatory from the effective date stated in the AD (Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f100-58-engine-operating-limits-and-warnings","history":"/api/acts/ad-f100-58-engine-operating-limits-and-warnings/history","analysis":"/api/acts/ad-f100-58-engine-operating-limits-and-warnings/analysis","conflicts":"/api/acts/ad-f100-58-engine-operating-limits-and-warnings/conflicts","importantCases":"/api/acts/ad-f100-58-engine-operating-limits-and-warnings/important-cases","documents":"/api/acts/ad-f100-58-engine-operating-limits-and-warnings/documents"}}