blind approach beacon system
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blind approach beacon system[¦blīnd ə′prōch ′bē·kən ‚sis·təm]
A pulse-type, ground-based navigation beacon used for runway approach at airports, which sends out signals that produce range and runway position information on the L-scan cathode-ray indicator of an aircraft making an instrument approach. Also known as beam approach beacon system (British usage). Abbreviated babs.