{"id":"F2006B05032","name":"AD/CESSNA 180/10 Amdt 2 - Main Undercarriage U Bolts","slug":"ad-cessna-180-10-amdt-2-main-undercarriage-u-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44942,"registerId":"commonwealth-F2006B05032-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/10 Amdt 2 - Main Undercarriage U 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)  \nCessna 180, 182 and Wren 460 Series Aeroplanes\n\nAD/CESSNA 180/10\n\nAmdt 2\n\n  \nMain Undercarriage “U” Bolts 6/78\n\nApplicability: All 182 and Wren 460 series fitted with “U” Bolts P/N 0541153.\n\nRequirement: 1\\. Visual: Inspect the main undercarriage “U” bolts P/N 0541153 types in situ for cracks or other damage and check that the “U” bolt retaining nuts are torqued to the values specified in the Cessna Service Manual.\n\n2. Magnetic Particle: Remove the main undercarriage “U” bolts P/N 0541153 types and inspect by the magnetic particle method for cracks particularly in the radius of the bends and in the root of the threads.\n\nCompliance: Visual: At intervals not exceeding 100 hours time in service.\n\nMagnetic Particle: At intervals not exceeding 500 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 of an existing Airworthiness Directive, but the scope remains tightly focused on the original safety issue: inspecting specific U-bolts on specific aircraft models. The amendment appears to be a routine update (possibly to clarify applicability or inspection methods) rather than an expansion into unrelated areas."},"complexity_factors":["Very short document (under 200 words)","Only one defined term (P/N 0541153 — a part number)","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","Simple conditional structure: if aircraft type X has part Y, do inspections Z","Clear, unambiguous compliance intervals (100 hours / 500 hours)","No exceptions, exemptions, or nested logic"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific Cessna aeroplanes (the 182 and Wren 460 series) that use a particular type of U-bolt (part number 0541153) on their main landing gear.\n\n**What it requires:**\n- **Visual inspection**: Owners or operators must regularly check these U-bolts for cracks or damage, and ensure the nuts are tightened to the correct tension (torque). This must happen **every 100 hours of flight time**.\n- **Magnetic particle inspection**: Every **500 hours of flight time**, the U-bolts must be removed and tested using a special crack-detection method that uses magnetic fields and iron particles to reveal hidden flaws — especially around bends and threads.\n\n**Why it matters:**\nU-bolts hold the landing gear to the aircraft. If they fail, the landing gear could collapse during takeoff or landing. This directive prevents accidents by catching metal fatigue before it becomes catastrophic. Compliance is legally mandatory — you cannot fly the aircraft without doing these checks."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled as Amendment 2 (Amdt 2) to AD/CESSNA 180/10, which indicates it amends a prior directive. The text provided sets out the current applicability, inspection requirements and intervals but does not include the original AD text, so the precise nature of the change from the original instrument is not specified in the source. The available document therefore reflects an amended scope relative to an earlier version, though the specific additions or revisions are not shown here."},"complexity_factors":["Specific applicability to particular aircraft series and a single part number (Applicability)","Two-tier inspection regime with different methods and intervals (visual every ≤100 hours; magnetic‑particle every ≤500 hours) (Compliance)","Requirement to remove the part for the magnetic‑particle inspection, increasing labour/time and procedural steps (Requirement 2)","Reference to an external technical source (Cessna Service Manual) for required torque values, creating a dependency on another document (Requirement 1)","Need for specialised non‑destructive testing equipment and qualified technicians for magnetic‑particle inspection (Requirement 2)","Operational impact on maintenance scheduling and aircraft downtime due to recurring inspection intervals (Compliance)"],"plain_english_summary":"This AD requires operators of Cessna 182 and Wren 460 series aircraft fitted with main undercarriage U‑bolts P/N 0541153 to inspect those bolts for cracks/damage and confirm nut torque: visual inspections in situ every ≤100 hours and magnetic‑particle NDT after removal every ≤500 hours (torque per the Cessna Service Manual).\n\nIt affects aircraft owners/operators by imposing recurring inspections, possible bolt removal, NDT equipment or contractor use, and associated labor, downtime and compliance costs to detect load‑bearing failures earlier."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-10-amdt-2-main-undercarriage-u-bolts","history":"/api/acts/ad-cessna-180-10-amdt-2-main-undercarriage-u-bolts/history","analysis":"/api/acts/ad-cessna-180-10-amdt-2-main-undercarriage-u-bolts/analysis","conflicts":"/api/acts/ad-cessna-180-10-amdt-2-main-undercarriage-u-bolts/conflicts","importantCases":"/api/acts/ad-cessna-180-10-amdt-2-main-undercarriage-u-bolts/important-cases","documents":"/api/acts/ad-cessna-180-10-amdt-2-main-undercarriage-u-bolts/documents"}}