{"id":"F2006B05050","name":"AD/CESSNA 180/38 - Nose Wheel Pivot Bolt","slug":"ad-cessna-180-38-nose-wheel-pivot-bolt","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44960,"registerId":"commonwealth-F2006B05050-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/38 - Nose Wheel Pivot Bolt","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 180, 182 and Wren 460 Series Aeroplanes\n\n \n\nAD/CESSNA 180/38 Nose Wheel Pivot Bolt 1/74\n\nApplicability: All amphibian models with Scott nose wheel assemblies. Requirement:  Retire the nosewheels pivot bolts from service.\n\nCompliance: 1. Within 100 hours time in service after 31 January 1974 for those nosewheel pivot bolts which have achieved 500 hours time in service and thereafter at intervals not exceeding 600 hours time in service.\n\n \n\n2. All other nosewheel pivot bolts, before achieving 600 hours time in service and thereafter at intervals not exceeding 600 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\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 discrete, targeted safety directive focused on a specific mechanical defect in specific aircraft models. It has not expanded beyond its original purpose of mandating bolt replacement intervals."},"complexity_factors":["Single, specific mechanical component addressed (nose wheel pivot bolt)","Only two compliance pathways based on hours-in-service thresholds","No defined terms section or interpretive provisions","No cross-references to other legislation or technical standards","Straightforward time-based replacement intervals without conditional exceptions","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it does:**\nIt orders owners and operators of specific Cessna aircraft (the 180, 182, and Wren 460 series amphibian models fitted with Scott nose wheel assemblies) to **replace their nose wheel pivot bolts** on a strict schedule to prevent mechanical failure.\n\n**Who it affects:**\n- Owners and operators of Cessna 180, 182, and Wren 460 amphibian aircraft\n- Specifically those using Scott nose wheel assemblies\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nPivot bolts are critical structural components that attach the nose wheel to the aircraft. If one fails during takeoff, landing, or taxiing, the nose wheel could collapse, causing loss of control, runway excursions, or serious accidents. This AD mandates **time-based retirement** (replacement before failure) rather than waiting for visible wear.\n\n**The replacement schedule:**\n- **High-time bolts** (already used for 500+ hours): Replace within 100 hours after 31 January 1974, then every 600 hours thereafter\n- **All other bolts**: Replace before hitting 600 hours of use, then every 600 hours thereafter\n\nThis is a **preventive maintenance requirement** — it doesn't fix a problem that's already happened, but stops a potential catastrophic failure before it occurs."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text supplied sets retirement intervals for the specified pivot bolts but does not indicate any expansion or reduction of affected components compared with prior instruments. There is no statement in the supplied text that the scope has been altered from an earlier intent; it simply prescribes retirement and recurring withdrawal intervals for the listed bolts. (Applicability; Requirement; Compliance)"},"complexity_factors":["Narrow technical scope — applies only to nosewheel pivot bolts on amphibian models with Scott assemblies (limited number of parts/aircraft). (Applicability)","Simple, prescriptive time‑based compliance intervals (500/100/600 hours), which reduce interpretive complexity. (Compliance)","Operational complexity arises from tracking individual bolt time‑in‑service and distinguishing which bolts had 500 hours as of a specified historical date (31 January 1974). (Compliance para 1)","Text does not specify replacement‑part requirements or approved alternatives, creating practical ambiguity for maintenance execution. (Requirement)","Enforcement and record‑keeping procedures are not detailed in the text, leaving implementation to operators/regulators outside the directive wording. (Requirement/Compliance)"],"plain_english_summary":"This Civil Aviation Safety Authority airworthiness directive requires owners/operators of amphibian Cessna 180/182 and Wren 460 aircraft fitted with Scott nose‑wheel assemblies to retire specified nose‑wheel pivot bolts on an hours‑in‑service schedule (600‑hour recurring retirements, with a short transitional rule for bolts near 500 hours as of 31 Jan 1974). It forces recurring bolt replacement, shifting record‑keeping, parts and maintenance costs to operators to ensure continued airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-38-nose-wheel-pivot-bolt","history":"/api/acts/ad-cessna-180-38-nose-wheel-pivot-bolt/history","analysis":"/api/acts/ad-cessna-180-38-nose-wheel-pivot-bolt/analysis","conflicts":"/api/acts/ad-cessna-180-38-nose-wheel-pivot-bolt/conflicts","importantCases":"/api/acts/ad-cessna-180-38-nose-wheel-pivot-bolt/important-cases","documents":"/api/acts/ad-cessna-180-38-nose-wheel-pivot-bolt/documents"}}