{"id":"F2008L02571","name":"AD/AT 800/11 - Overturn Skid Plate","slug":"ad-at-800-11-overturn-skid-plate","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74576,"registerId":"commonwealth-F2008L02571-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airtractor 800 Series Aeroplanes","sectionType":"division","heading":"Airtractor 800 Series Aeroplanes","content":"### Airtractor 800 Series Aeroplanes\n\n| AD/AT 800/11 | Overturn Skid Plate | 8/2008 |\n| ------------ | ------------------- | ------ |\n\n| Applicability: | Air Tractor AT-802A with Serial Numbers -0003 through -0282.                                                                                                                                                                                  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---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | If overturn skid plate kit part number (P/N) 11411-1-500 or an FAA-approved equivalent P/N is already installed, then install P/N 11411-1-501 modification kit.If there is no overturn skid plate installed, then install overturn skid plate kitP/N 11411-1-502 or an FAA approved equivalent part number.Note: FAA AD 2008-11-17 and Snow Engineering Service Letter #97, revised7 November 2007 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Compliance:    | Within 180 days after the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 31 July 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | The FAA received accident reports on Model AT-301 and AT-401 aircraft which indicate that the aircraft skids tail first during an overturn. As a result, the windshield and curved overturn tube act as a scoop, foreign material enters the cockpit if the canopy is damaged; and this foreign material then enters into the cabin area and possibly contributes to pilot deaths. The manufacturer installed an overturn skid plate which was intended to minimise the possibility of dirt or mud penetrating the cockpit during an overturn skid and causing pilot asphyxia or injury.There have subsequently been reports of the bolts that attach the forward end of the original design overturn skid plate breaking in an overturn accident. This allowed the skid plate to rotate around the rear attach point and the forward end of the plate to enter the cockpit area. This Airworthiness Directive is issued to ensure overturn skid plates are installed and, if already installed, prevent the front and rear connections of the overturn skid plate breaking. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n13 June 2008","sortOrder":0},{"sectionNumber":"AD/AT 800/11","sectionType":"part","heading":"AD/AT 800/11","content":"## AD/AT 800/11","sortOrder":1},{"sectionNumber":"Overturn Skid Plate","sectionType":"part","heading":"Overturn Skid Plate","content":"## Overturn Skid Plate","sortOrder":2},{"sectionNumber":"8/2008","sectionType":"part","heading":"8/2008","content":"## 8/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD’s scope aligns with its stated intent: ensure overturn skid plates are installed and prevent front/rear attachment failures by prescribing upgraded or new kit P/Ns for AT‑802A serials -0003 to -0282, to be completed within 180 days (Requirement; Compliance; Background). It does not broaden applicability beyond those serial numbers or impose additional operational restrictions."},"complexity_factors":["Narrow applicability limited to Air Tractor AT-802A serial numbers -0003 through -0282 (Applicability)","Multiple specific part numbers with allowance for FAA‑approved equivalents (Requirement)","Single 180‑day compliance deadline creates scheduling and sourcing pressure (Compliance)","Technical retrofit/installation and inspection work required, potentially needing specialised labour","Cross‑references to FAA AD 2008-11-17 and Snow Engineering Service Letter #97 introduce external technical guidance and verification expectations (Background)","Potential for parts availability, import or certification delays affecting timely compliance"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Air Tractor AT-802A aeroplanes (serials -0003 to -0282) to fit a specified overturn skid‑plate kit within 180 days: upgrade P/N 11411-1-501 if P/N 11411-1-500 is fitted, or install P/N 11411-1-502 (or FAA‑approved equivalents) if none is fitted. The measure addresses reports that original skid‑plate bolts can fail in overturns, allowing debris into the cockpit (Background). Compliance costs — parts, labour and inspection — fall on aircraft owners/operators and must meet the AD’s timing and technical requirements."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with focused, original intent. It addresses a specific mechanical defect in a defined aircraft population without expansion into broader regulatory areas."},"complexity_factors":["Single, clearly defined applicability (specific serial number range)","Straightforward conditional logic (two scenarios: plate installed vs not installed)","Only three specific part numbers referenced","Single compliance deadline (180 days)","No nested exceptions or complex cross-referencing","Background narrative clearly explains safety rationale","Document is short (approximately 300 words of substantive content)"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of Air Tractor AT-802A crop‑dusters (serials -0003 to -0282 in Australia) to fit an improved overturn skid plate — upgrading or installing the kit as needed — to fix a design flaw that can let the plate break free and penetrate the cockpit during overturns. It’s a mandatory safety fix after fatal overturn incidents; compliance was required within 180 days of 31 July 2008."}},"importantCases":[],"_links":{"self":"/api/acts/ad-at-800-11-overturn-skid-plate","history":"/api/acts/ad-at-800-11-overturn-skid-plate/history","analysis":"/api/acts/ad-at-800-11-overturn-skid-plate/analysis","conflicts":"/api/acts/ad-at-800-11-overturn-skid-plate/conflicts","importantCases":"/api/acts/ad-at-800-11-overturn-skid-plate/important-cases","documents":"/api/acts/ad-at-800-11-overturn-skid-plate/documents"}}