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- Definição1
- (1) The height above the ground or water of the base of the lowest layer of cloud below 6000 m (20,000 ft), covering more than half the sky (ICAO). The term also refers to the vertical visibility in a surface-based layer that completely obscures the whole sky, whichever is lesser. (2) The highest pressure altitude that can be reached by an aircraft, excepting a zoom climb. At this altitude, the aircraft rate of climb is zero.
- Fonte1
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Definição2
- The height above the earth's surface of the lowest layer of clouds, which is reported as broken or overcast, or the vertical visibility into an obscuration.
- Fonte2
- FEDERAL AVIATION ADMINISTRATION. Pilot's handbook of aeronautical knowledge. [s.l.], 2008. Disponível em: http://www.faa.gov/regulations_policies/handbooks_manuals/av iation/pilot_handbook/media/PHAK%20-%20Cover-Preface.pdf. Acesso em: 26 jun. 2014.
- Fonte3
- AGÊNCIA NACIONAL DE AVIAÇÃO CIVIL. RBAC 01: regulamentos brasileiros de aviação civil. Definições, regras de redação e unidades de medida. [S.l.], 2008. (Regulamentos Brasileiros de Aviação Civil).
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