{"id":"F2006B05165","name":"AD/CESSNA 188/3 Amdt 1 - Main Undercarriage Legs","slug":"ad-cessna-188-3-amdt-1-main-undercarriage-legs","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45285,"registerId":"commonwealth-F2006B05165-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 188/3 Amdt 1 - Main Undercarriage Legs","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 188 (Agwagon) Series Aeroplanes\n\n \n\nAD/CESSNA 188/3\n\nAmdt 1\n\n\nMain Undercarriage Legs 2/69\n\n \n\nApplicability: All models not fitted with spring leg P/No. 1641007.\n\n \n\nRequirement: Inspect the main undercarriage spring legs for cracking in the vicinity of the bend adjacent to fuselage attachment points using the magnetic particle method.\n\n \n\nCompliance: At intervals not exceeding 300 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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive focused on a specific safety-critical inspection. It has not expanded beyond its original purpose of ensuring Cessna 188 landing gear integrity. The amendment (Amdt 1) appears to be a routine update to the original AD/CESSNA 188/3, likely clarifying applicability or inspection intervals without broadening scope."},"complexity_factors":["Extremely short document (under 150 words)","Only 4 operative provisions: applicability, requirement, compliance method, and compliance interval","Single defined term: 'time in service' (standard aviation term, implicitly defined)","No cross-references to other legislation or regulations","No conditional logic, exceptions, or nested provisions","Straightforward command structure: 'Inspect X using Y method every Z hours'"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a compulsory recall notice, but for aircraft parts rather than cars.\n\n**What it does:** It requires owners and operators of **Cessna 188 \"Agwagon\" agricultural aircraft** to regularly inspect the main landing gear (undercarriage) for dangerous cracks.\n\n**Who must comply:** Anyone operating a Cessna 188 model that does **not** have a specific upgraded spring leg part (part number 1641007).\n\n**The specific requirement:** Operators must use **magnetic particle inspection** — a specialised crack-detection method using magnetic fields and iron particles — to check for cracks near the bend where the landing gear attaches to the fuselage.\n\n**How often:** This inspection must be done **every 300 hours of flight time** (\"time in service\" means actual flying hours, not just calendar time).\n\n**Why it matters:** Landing gear failures during takeoff or landing can be catastrophic. This directive prevents accidents by catching metal fatigue cracks before they cause structural failure. The Cessna 188 is a workhorse crop-dusting plane that operates from rough rural airstrips, putting heavy stress on its undercarriage."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled as an amendment (Amdt 1) to AD/CESSNA 188/3, and the text as presented applies to all Cessna 188 models except those fitted with spring leg P/No. 1641007 (Applicability), requiring magnetic particle inspection of the spring legs at intervals not exceeding 300 hours time in service (Requirement; Compliance). The document provided does not include the original pre‑amendment text, so the precise nature of the change from the original cannot be stated here. The amendment as published sets the current scope by (a) defining the affected fleet (with a part‑number exemption), (b) specifying the inspection method (magnetic particle), and (c) setting the inspection interval (300 hours)."},"complexity_factors":["Narrow technical requirement: single structural component and a specific inspection location (bend adjacent to fuselage attachment) (Requirement).","Specified non‑destructive testing method (magnetic particle) increases need for skilled personnel and equipment (Requirement).","Recurring compliance interval (every 300 hours TIS) creates ongoing scheduling and recordkeeping obligations (Compliance).","Applicability exemption tied to a specific part number (P/No. 1641007) introduces a substitution decision and supplier concentration risk (Applicability).","The AD does not include remedial actions, acceptance criteria, or qualifications for who may perform or sign off inspections, creating operational ambiguity and potential for differing interpretations (absence across Requirement/Compliance)."],"plain_english_summary":"This airworthiness directive requires owners/operators of Cessna 188 (Agwagon) aeroplanes to carry out recurring magnetic‑particle inspections of the main spring legs (every 300 flight hours) to detect cracking, unless the aircraft is fitted with spring leg P/No. 1641007. It matters because it imposes recurring maintenance costs, potential downtime and repairs when cracks are found, and creates an incentive to fit the exempt part to avoid the inspection burden."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-188-3-amdt-1-main-undercarriage-legs","history":"/api/acts/ad-cessna-188-3-amdt-1-main-undercarriage-legs/history","analysis":"/api/acts/ad-cessna-188-3-amdt-1-main-undercarriage-legs/analysis","conflicts":"/api/acts/ad-cessna-188-3-amdt-1-main-undercarriage-legs/conflicts","importantCases":"/api/acts/ad-cessna-188-3-amdt-1-main-undercarriage-legs/important-cases","documents":"/api/acts/ad-cessna-188-3-amdt-1-main-undercarriage-legs/documents"}}