{"id":"F2006B09818","name":"AD/F28/83 - Engine Support Filler Plates","slug":"ad-f28-83-engine-support-filler-plates","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54755,"registerId":"commonwealth-F2006B09818-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.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 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.","sortOrder":0},{"sectionNumber":"AD/F28/83 Engine Support Filler Plates 2","sectionType":"part","heading":"AD/F28/83 Engine Support Filler Plates 2/2000","content":"# AD/F28/83 Engine Support Filler Plates 2/2000\n\nApplicability: F28 Models 1000 to 4000, all serial numbers.\n\nRequirement: Inspect, and rectify where necessary, in accordance with Fokker SB F28/53-149.\n\nNote: RLD BLA No. 1999-153 refers.\n\nCompliance: Before 31 December 2000.\n\nThis Airworthiness Directive becomes effective on 24 February 2000.\n\nBackground: Engine support filler plates have been found at random on similar build aircraft. The filler plates do not contribute to the structural integrity of the upper or lower legs in the fittings in which they were found, and may easily be misinterpreted as being part of the fitting being inspected. As such the filler plates hamper proper inspection as called out in the SIP. This is a condition which may result in any cracking being undetected and is unsafe.\n\nThis Directive requires a one time inspection of the engine support fittings for the presence of the filler plates, the discarding of the plates if fitted, and an additional inspection for cracking.\n\n![](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 11 January 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 27 January 2000.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, one-off safety directive addressing a specific technical issue with a specific aircraft type. It has not expanded beyond its original purpose of addressing the filler plate inspection issue."},"complexity_factors":["Very short document (approximately 250 words)","Only 1 defined term (the applicability section defines the aircraft models)","No cross-references to other legislation beyond a single reference to CAR 1998 subregulation 39.1(1) and a service bulletin","Simple conditional logic: single requirement with straightforward compliance deadline","No nested exceptions or complex procedural requirements","Single-purpose directive with clear, unambiguous instructions"],"plain_english_summary":"This AD requires operators of all Fokker F28 models (1000–4000 series) to inspect engine support fittings for non‑structural “filler plates,” remove any found, and carry out targeted crack inspections per Fokker Service Bulletin F28/53‑149 before 31 December 2000. It closes a safety gap where cosmetic plates can mask cracks in engine supports, which—if undetected—could lead to engine failure or separation in flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive matches its stated purpose: to address an unsafe condition caused by filler plates that can hide cracking. Applicability covers F28 Models 1000–4000, all serial numbers, and the Requirement prescribes inspection, removal where present, and crack inspection in accordance with the cited Fokker service bulletin. The text does not indicate any expansion or narrowing of scope beyond that stated (Applicability; Requirement; Background)."},"complexity_factors":["Single, specific action: a one‑time inspection plus rectification and additional crack inspection (Requirement; Background).","Broad applicability across F28 Models 1000–4000, all serial numbers (Applicability) increases operational coverage.","Reliance on an external document—Fokker SB F28/53‑149—to specify inspection and rectification procedures (Requirement).","Fixed compliance deadline (Before 31 December 2000) creates a time‑bound compliance burden (Compliance).","Background identifies inspection ambiguity because filler plates may be misinterpreted as part of the fitting, which affects inspection accuracy (Background).","Issued under CASA authority by a delegate pursuant to CAR 1998 subreg 39.1(1), which sets regulatory force and administrative discretion (introductory text).","Cross‑reference to RLD BLA No. 1999‑153 adds an additional document to consult (Note).","Operational actions include discarding physical parts if fitted and performing additional inspections, which impose direct procedural and disposal steps on operators (Requirement; Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of Fokker F28 models 1000–4000 to carry out a one‑time inspection of the engine support fittings for filler plates, remove any filler plates found, and inspect for cracking, using Fokker SB F28/53‑149. It matters because filler plates can be mistaken for structural parts and may hide cracks; the AD sets a compliance deadline and prescribes the corrective steps to detect and fix any cracking."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-83-engine-support-filler-plates","history":"/api/acts/ad-f28-83-engine-support-filler-plates/history","analysis":"/api/acts/ad-f28-83-engine-support-filler-plates/analysis","conflicts":"/api/acts/ad-f28-83-engine-support-filler-plates/conflicts","importantCases":"/api/acts/ad-f28-83-engine-support-filler-plates/important-cases","documents":"/api/acts/ad-f28-83-engine-support-filler-plates/documents"}}