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a helicopter with performance such that, in case of engine failure at any point in the flight profile, a forced landing must be performed
3. lennuklassi kopter . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/3.%20lennuklassi%20kopter/1/est (07.07.2026)