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This paper presents an Assured Contingency Landing Management (ACLM) framework that innovatively integrates preflight and online planning to enhance safety while minimizing the need for real-time computation. A nominal flight plan and associated risk-categorized landing site database generate and store contingency landing plans before the flight. During flight, ACLM monitors aircraft controllability and destination reachability to rapidly identify any need for an urgent or emergency landing. To react, a viable urgent landing plan is retrieved and executed when available, or a new flight plan is constructed and executed otherwise. This paper describes the realization of ACLM in a small hexacopter uncrewed aircraft system (UAS) use case. Experimentally derived performance, battery, and propulsion system degradation models are used in controllability, reachability, and flight planning. Results show the efficacy and statistical performance of the proposed ACLM architecture in progressively challenging degradation and failure scenarios. The integrated ACLM architecture and its application to a realistic hexacopter and urban map case study are contributions of this work.<\/jats:p>","DOI":"10.2514\/1.i011675","type":"journal-article","created":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T06:49:21Z","timestamp":1765954161000},"page":"155-173","update-policy":"https:\/\/doi.org\/10.2514\/aiaa_crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Runtime Performance Verification of Assured Contingency Landing Management for Advanced Air Mobility"],"prefix":"10.2514","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9292-5139","authenticated-orcid":false,"given":"Joseph","family":"Kim","sequence":"first","affiliation":[{"name":"University of Michigan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Prashin","family":"Sharma","sequence":"additional","affiliation":[{"name":"University of Michigan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeremy","family":"Castagno","sequence":"additional","affiliation":[{"name":"Springfield College"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Natasha","family":"Neogi","sequence":"additional","affiliation":[{"name":"NASA Langley Research Center"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2132-6256","authenticated-orcid":false,"given":"Ella","family":"Atkins","sequence":"additional","affiliation":[{"name":"Virginia Tech"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1387","reference":[{"key":"r1","unstructured":"HoldenJ.GoelN. \u201cFast-Forwarding to a Future of On-Demand Urban Air Transportation [White Paper],\u201d 2016, https:\/\/www.uber.com\/elevate.pdf\/ [retrieved 17 June 2021]."},{"key":"r2","doi-asserted-by":"publisher","DOI":"10.2514\/6.2019-3255"},{"key":"r3","doi-asserted-by":"crossref","unstructured":"KimJ.SharmaP.AtkinsE.NeogiN.DillE.YoungS. \u201cAssured Contingency Landing Management for Advanced Air Mobility,\u201d 2021 IEEE\/AIAA 40th Digital Avionics Systems Conference (DASC), Inst. of Electrical and Electronics Engineers, New York, 2021, pp.\u00a01\u201312. 10.1109\/DASC52595.2021.9594498","DOI":"10.1109\/DASC52595.2021.9594498"},{"key":"r4","doi-asserted-by":"crossref","unstructured":"OsborneM.LantairJ.ShafiqZ.ZhaoX.RobuV.FlynnD.PerryJ. \u201cUAS Operators Safety and Reliability Survey: Emerging Technologies Towards the Certification of Autonomous UAS,\u201d 2019 4th International Conference on System Reliability and Safety (ICSRS), Inst. of Electrical and Electronics Engineers, New York, 2019, pp.\u00a0203\u2013212.","DOI":"10.1109\/ICSRS48664.2019.8987692"},{"key":"r5","doi-asserted-by":"publisher","DOI":"10.2514\/1.C035319"},{"key":"r6","doi-asserted-by":"crossref","unstructured":"SharmaP.AtkinsE. \u201cPrognostics-Informed Battery Reconfiguration in a Multi-Battery Small UAS Energy System,\u201d 2021 International Conference on Unmanned Aircraft Systems (ICUAS), Inst. of Electrical and Electronics Engineers, New York, 2021, pp.\u00a0423\u2013432.","DOI":"10.1109\/ICUAS51884.2021.9476773"},{"key":"r7","doi-asserted-by":"crossref","unstructured":"KhanH. 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