{"id":"F2006B10800","name":"AD/IAI-W/24 - Engine Inlet Cowl and Aft Nacelle Attachment Bolts","slug":"ad-iai-w-24-engine-inlet-cowl-and-aft-nacelle-attachment-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56265,"registerId":"commonwealth-F2006B10800-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/IAI-W/24 - Engine Inlet Cowl and Aft Nacelle Attachment Bolts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n\nAIRWORTHINESS 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\nIsrael Aircraft Industries 1123 & 1124 (Westwind) Series Aeroplanes\n\nAD/IAI-W/24 Engine Inlet Cowl and Aft Nacelle Attachment\n\nBolts\n\n  \n8/2001\n\nDM\n\nApplicability: All Model 1124/1124A Westwind aircraft.\n\nRequirement: Action in accordance with Israel Aircraft Industries Alert Service Bulletin 1124-54A- 138.\n\nNote: Israel CAA AD 54-01-05-02 refers.\n\nCompliance: Within 50 hours time in service after 4 July 2001.\n\nThis Airworthiness Directive becomes effective on 4 July 2001.\n\nBackground: On some aircraft, AN3 part number bolts have been found installed on engine case flanges. These bolts are not approved and are considered as fatigue critical for this application. This Directive requires verification of approved bolts.\n\n![Signature of David Alan Villiers](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 27 June 2001\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 4 July 2001.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of ensuring proper bolt installation on Westwind aircraft engine cowlings."},"complexity_factors":["Very short document (1 page)","Only 4 defined structural sections (Applicability, Requirement, Compliance, Background)","Single, unambiguous action required (follow specific service bulletin)","No nested exceptions or conditional logic","Clear, fixed compliance deadline (50 hours after effective date)","Minimal cross-referencing (only one service bulletin and one related foreign AD mentioned)"],"plain_english_summary":"This CASA safety order applies to Israel Aircraft Industries Westwind 1124 and 1124A business jets and requires operators to inspect and replace certain engine inlet cowl and aft nacelle bolts found to be unapproved AN3 fasteners. Per IAI Alert Service Bulletin 1124-54A-138, work must be done within 50 flight hours of 4 July 2001 to prevent metal-fatigue failures that could detach engine parts in flight."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD enforces verification of approved bolts on all Model 1124/1124A aircraft within the stated compliance window, matching the stated safety objective in the Background and Requirement sections. It does not expand applicability or introduce new categories of aircraft or defects beyond those identified."},"complexity_factors":["Narrow applicability: applies only to all Model 1124/1124A Westwind aircraft (Applicability).","External-reference dependence: compliance requires following Israel Aircraft Industries Alert Service Bulletin 1124-54A-138 (Requirement), which must be obtained and read.","Short mandated compliance window: action required within 50 hours time-in-service after 4 July 2001 (Compliance).","Technical identification and replacement task: involves determining whether installed bolts are approved and replacing fatigue‑critical hardware if not (Background).","Cross-jurisdictional linkage: notes Israel CAA AD as related guidance, adding coordination or confirmation needs for some operators (Note).","Low regulatory complexity in text: AD states required action but delegates procedural detail to the manufacturer's service bulletin (Requirement), reducing statutory detail but increasing operational reliance on the SB."],"plain_english_summary":"This Airworthiness Directive requires operators of Israel Aircraft Industries Westwind Model 1124/1124A to inspect and verify that the engine inlet cowl and aft nacelle attachment bolts are approved, following Israel Aircraft Industries Alert Service Bulletin 1124-54A-138. The action must be completed within 50 hours time-in-service after 4 July 2001 because unapproved AN3 bolts were found and are considered fatigue‑critical for this application."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-24-engine-inlet-cowl-and-aft-nacelle-attachment-bolts","history":"/api/acts/ad-iai-w-24-engine-inlet-cowl-and-aft-nacelle-attachment-bolts/history","analysis":"/api/acts/ad-iai-w-24-engine-inlet-cowl-and-aft-nacelle-attachment-bolts/analysis","conflicts":"/api/acts/ad-iai-w-24-engine-inlet-cowl-and-aft-nacelle-attachment-bolts/conflicts","importantCases":"/api/acts/ad-iai-w-24-engine-inlet-cowl-and-aft-nacelle-attachment-bolts/important-cases","documents":"/api/acts/ad-iai-w-24-engine-inlet-cowl-and-aft-nacelle-attachment-bolts/documents"}}