{"id":"F2006B08308","name":"AD/CESSNA 400/20 Amdt 1 - Emergency Exit Window - Modification","slug":"ad-cessna-400-20-amdt-1-emergency-exit-window-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115709,"registerId":"commonwealth-F2006B08308-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/20 Amdt 1 - Emergency Exit Window - Modification","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 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/20\n\nAmdt 1\n\n\nEmergency Exit Window - Modification 5/71\n\n \n\nApplicability: All model 401, 401A and 401B with S/Nos. 401-0041 to 401B-0052. All model 402, 402A and 402B with S/Nos. 402-0041 to 402B-0030. Model 411 and 411A with S/Nos. 411-0235 to 411A-0300.\n\n \n\nDocument: Cessna SL ME70-30 (Supplement 1).\n\n \n\nCompliance: Within 100 hours time in service after 30 June 1971.\n\n \n\nNote: Compliance with the preceding issue of this Directive satisfies compliance with this issue of the Directive.\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 narrow, targeted safety directive focused on a specific mechanical modification to specific aircraft. It has not expanded beyond its original purpose of addressing emergency exit window defects in early Cessna 400-series aircraft. The amendment (Amdt 1) appears to be a minor update, likely clarifying the compliance note or technical reference, without broadening scope."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined elements: applicability (aircraft models/serial numbers), document reference, compliance deadline, and a single note about prior compliance","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple conditional logic: only one applicability test (serial number ranges) and one compliance condition","Single technical reference to manufacturer document (Cessna SL ME70-30)","No nested exceptions or layered definitions"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Cessna 400-series twin-engine aircraft** (models 401, 401A, 401B, 402, 402A, 402B, 411, and 411A) to modify the **emergency exit windows** on their planes.\n\n**Who it affects:**\n- Owners and operators of specific Cessna aircraft with **serial numbers in listed ranges** (for example, serial numbers 401-0041 through 401B-0052 for the 401 series)\n- This captures roughly the early production runs of these aircraft models\n\n**What must be done:**\n- Aircraft must be modified according to **Cessna Service Letter ME70-30 (Supplement 1)** — a technical document from the manufacturer specifying exactly how to make the change\n- The work must be completed **within 100 hours of flying time after 30 June 1971**\n\n**Why it matters:**\nEmergency exit windows are critical for passenger evacuation during emergencies. This directive addresses a safety defect in the original design of these windows on early-production Cessna 400-series aircraft. The modification ensures the windows function properly as emergency exits.\n\n**Important note:** If an aircraft was already modified under the previous version of this directive, that counts as compliance — owners don't need to do the work again."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive is an amendment (Amdt 1) but explicitly states that compliance with the preceding issue satisfies compliance with this issue (see \"Note:\"). On the face of the text provided, the applicability, required action (modify the emergency exit window per Cessna SL ME70-30 Supplement 1) and the compliance deadline are specified; there is no text in this instrument that expands or narrows the affected aircraft or the required action relative to the preceding issue. Therefore, based on the supplied text, the practical scope of who must comply and what must be done has not changed."},"complexity_factors":["Narrow, clearly defined applicability by model and serial number ranges (lowens complexity)","Single, simple compliance metric (100 hours time in service after a fixed date)","External technical detail delegated to a single referenced manufacturer document (Cessna SL ME70-30 (Supplement 1))","Short text with no multiple options, exemptions or procedural layers","Administrative requirement to track hours and retain evidence of compliance"],"plain_english_summary":"This Airworthiness Directive requires a specific modification to the emergency-exit window on listed Cessna 400-series aircraft, to be carried out per the manufacturer document Cessna SL ME70‑30 (Supplement 1).\n\nIt applies to the specified model/serial-number ranges and must be completed within 100 hours time‑in‑service after 30 June 1971; owners/operators must obtain the service letter, fund and schedule the work, and prior compliance under the earlier issue is treated as compliant."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-20-amdt-1-emergency-exit-window-modification","history":"/api/acts/ad-cessna-400-20-amdt-1-emergency-exit-window-modification/history","analysis":"/api/acts/ad-cessna-400-20-amdt-1-emergency-exit-window-modification/analysis","conflicts":"/api/acts/ad-cessna-400-20-amdt-1-emergency-exit-window-modification/conflicts","importantCases":"/api/acts/ad-cessna-400-20-amdt-1-emergency-exit-window-modification/important-cases","documents":"/api/acts/ad-cessna-400-20-amdt-1-emergency-exit-window-modification/documents"}}