{"id":"F2006B03541","name":"AD/BAe 146/94 - Fuselage Skin Chafing","slug":"ad-bae-146-94-fuselage-skin-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43108,"registerId":"commonwealth-F2006B03541-current","compilationNumber":null,"startDate":"2026-04-01","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\nBritish Aerospace BAe 146 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BAe 146/94 Fuselage Skin Chafing 13/2","sectionType":"part","heading":"AD/BAe 146/94 Fuselage Skin Chafing 13/2001","content":"# AD/BAe 146/94 Fuselage Skin Chafing 13/2001\n\nApplicability: All BAe 146 Series and all Avro 146 aircraft with modification HCM01037A embodied, and without modification HCM01698A embodied.\n\nRequirement: Inspect in accordance with BAe Systems Mandatory Service Bulletin ISB.53-162. Compliance: Initially inspect before 8,000 total landings or within 500 landings after 27 December\n\n2001, whichever occurs later. Repeat thereafter at intervals not to exceed 4,000 landings (if no damage or if allowable damage is present) until compliance with Service Bulletin 53-162-01698A (modification HCM01698A).\n\nThis Airworthiness Directive becomes effective on 27 December 2001.\n\nBackground: Reports were received of chafing of the fuselage skin and reinforcing plates along the seal/fuselage contact area.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 30 October 2001\n\n![](image.001.png)","sortOrder":1}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive — a targeted safety instrument addressing a specific technical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspections for fuselage skin chafing."},"complexity_factors":["Single, clearly defined applicability condition (two specific modifications)","One primary requirement (inspect per specified service bulletin)","Straightforward compliance timeline (landing-based intervals with clear 'whichever is later' logic)","No nested exceptions or conditional sub-clauses","Minimal cross-referencing (only to external service bulletin and modification numbers)","Short document (approximately 200 words of substantive text)"],"plain_english_summary":"This CASA safety order requires owners/operators of BAe 146 Series and Avro 146 aircraft that have modification HCM01037A but not HCM01698A to inspect for chafing where the fuselage skin contacts sealing plates, following BAe Systems Mandatory Service Bulletin ISB.53-162. The first inspection is due before 8,000 total landings (or within 500 landings after 27 Dec 2001, whichever is later) and must be repeated every 4,000 landings until the permanent fix is installed. It addresses skin wear that could weaken structure and risk safety."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD confines its scope to BAe 146/Avro 146 aeroplanes with modification HCM01037A embodied and without HCM01698A embodied and mandates inspections until HCM01698A is embodied (Applicability/Requirement/Compliance). There is no expansion beyond that configuration in the instrument text."},"complexity_factors":["Narrow applicability: only BAe 146 / Avro 146 with HCM01037A embodied and without HCM01698A embodied (Applicability).","Single technical remedy path: inspections per BAe Mandatory Service Bulletin ISB.53‑162 and eventual embodiment of modification HCM01698A (Requirement).","Time/compliance metric based on landing counts (initial before 8,000 landings or within 500 landings after 27 Dec 2001; repeat every 4,000 landings) introduces operational scheduling burden (Compliance).","Recurring inspections continue until modification is embodied, creating ongoing cost and planning consequences for operators (Requirement/Compliance).","Enforcement and effect derive from a CASA delegate AD under CAR 1998 subregulation 39.1(1), concentrating decision authority in the regulator (header/issuance).","Reliance on external technical document (manufacturer Mandatory Service Bulletin) for inspection instructions and for terminating action (Requirement)."],"plain_english_summary":"**This Airworthiness Directive requires operators of BAe 146 and Avro 146 aeroplanes (with HCM01037A embodied and without HCM01698A) to inspect the fuselage seal/contact area per BAe Mandatory Service Bulletin ISB.53‑162 and repeat inspections until modification HCM01698A is embodied (Applicability/Requirement/Compliance).**\n\nCASA's delegate issued the AD; operators pay inspection and modification costs, must meet landing‑count deadlines for initial and recurring inspections, and schedule the modification to stop the inspection cycle (Compliance/Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-94-fuselage-skin-chafing","history":"/api/acts/ad-bae-146-94-fuselage-skin-chafing/history","analysis":"/api/acts/ad-bae-146-94-fuselage-skin-chafing/analysis","conflicts":"/api/acts/ad-bae-146-94-fuselage-skin-chafing/conflicts","importantCases":"/api/acts/ad-bae-146-94-fuselage-skin-chafing/important-cases","documents":"/api/acts/ad-bae-146-94-fuselage-skin-chafing/documents"}}