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lubber line
- Definição1
- The reference line used in a magnetic compass or heading indicator.
- Fonte1
- UNITED STATES. Federal Aviation Administration. Instrument flying handbook. [Washington, DC: U.S: FAA, 2012]. Available at: faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/FAA-H-8083-15B.pdf. Access on: 10 jul. 2026.
- Definição2
- Reference index, usually parallel to aircraft longitudinal axis , eg on compass, denoting aircraft heading.
- Fonte2
- GUNSTON, Bill. The Cambridge aerospace dictionary. Cambridge: Cambridge University, 2004. (Cambridge aerospace series.)
- Definição3
- A datum line on an instrument indicating the fore-and-aft axis of the aircraft such as the small reference line used in reading the figures from the cord of an aeronautical compass.
- Fonte3
- CANADÁ. Termium plus: the Government of Canada’s terminology and linguistic data bank. Canadá, 2022. Disponível em: https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?lang=eng . Acesso em: 10 mar. 2022.
- Fonte4
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aircraft accident and incident investigation. Part III: investigation. Montreal, 2011. (Doc. 9756 AN/965).
- Contexto
- The HSI is a combination of a heading indicator, radio magnetic indicator, course indicator and range indicator. The aircraft heading is displayed on a rotating compass card under the upper lubber line.
- Subárea1
- Air Navigation
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