{"id":"F2006B04918","name":"AD/CESSNA 150/2 Amdt 1 - Main Undercarriage U Bolts","slug":"ad-cessna-150-2-amdt-1-main-undercarriage-u-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44762,"registerId":"commonwealth-F2006B04918-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/2 Amdt 1 - Main Undercarriage U Bolts","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)  Cessna 150, F150, 152 & F152 Series Aeroplanes\n\n \n\nAD/CESSNA 150/2\n\nAmdt 1\n\n\nMain Undercarriage “U” Bolts 11/67\n\n \n\nApplicability: All models fitted with “U” bolts P/N 0441161 types.\n\n \n\nRequirement: 1. Visual: Inspect the main undercarriage “U” bolts P/N 0441161 in situ for cracks and other damage and check that the “U” bolt retaining nuts are torqued to the values specified in the Cessna Service Manual.\n\n \n\n2. Magnetic Particle: Remove the main undercarriage “U” bolts P/N 0441161 and inspect by the magnetic particle method for cracks particularly in the radius of the bends and in the root of the threads.\n\n \n\nCompliance: Visual: At intervals not exceeding 100 hours time in service.\n\n \n\nMagnetic Particle: At intervals not exceeding 500 hours time in service.\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 standard Airworthiness Directive with a narrow, specific scope focused on safety inspections for a particular aircraft part. It has not expanded beyond its original purpose of ensuring airworthiness of Cessna 150 series landing gear components."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (P/N 0441161 — a part number)","No cross-references to other legislation or regulations","Simple conditional structure: if you have this aircraft with this part, do these two inspections on these schedules","No nested exceptions or complex logical operators","Single purpose: inspection requirements for one specific aircraft part"],"plain_english_summary":"This CASA Airworthiness Directive mandates regular inspections of specific U-bolts (P/N 0441161) on Cessna 150/F150/152/F152 main landing gear. It affects owners/operators of those aircraft and requires periodic visual checks and periodic magnetic particle testing to detect cracks and prevent landing-gear failure, reducing risk of catastrophic accidents."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument's applicability is explicitly limited to all models fitted with “U” bolts P/N 0441161. The text contains no indication that the applicability has been expanded or narrowed beyond that stated scope."},"complexity_factors":["Narrow technical focus limited to a single part number (P/N 0441161) and specific aircraft models","Two inspection methods with distinct intervals (visual in situ vs. removed magnetic‑particle NDT)","Reference to an external normative document (Cessna Service Manual) for torque values","Operational impacts: removal and NDT create maintenance downtime and cost to operators","No discretionary enforcement criteria or complex compliance pathways in the text"],"plain_english_summary":"This airworthiness directive requires owners/operators of Cessna 150/F150/152/F152 aeroplanes fitted with main undercarriage “U” bolts P/N 0441161 to perform recurring inspections: visual checks in place and torque checks to the Cessna Service Manual, plus periodic removal and magnetic‑particle inspection for cracks. It sets maximum intervals (visual ≤100 hours TIS; magnetic‑particle ≤500 hours TIS). Operators pay for inspections, removal and non‑destructive testing and must schedule maintenance downtime to comply."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-2-amdt-1-main-undercarriage-u-bolts","history":"/api/acts/ad-cessna-150-2-amdt-1-main-undercarriage-u-bolts/history","analysis":"/api/acts/ad-cessna-150-2-amdt-1-main-undercarriage-u-bolts/analysis","conflicts":"/api/acts/ad-cessna-150-2-amdt-1-main-undercarriage-u-bolts/conflicts","importantCases":"/api/acts/ad-cessna-150-2-amdt-1-main-undercarriage-u-bolts/important-cases","documents":"/api/acts/ad-cessna-150-2-amdt-1-main-undercarriage-u-bolts/documents"}}