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General - раздел Информатика, RADIO ALTIMETER SYSTEM – INTRODUCTION The Radio Altimeter (Ra) System Measures The Vertical Distance From The Airpl...
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The radio altimeter (RA) system measures the vertical distance from the airplane to the ground. The radio altitude shows in the flight compartment on the display units (DU). The radio altitude is computed with the receiver transmitter unit by comparing the transmitted signal to the received signal. The R/T unit transmits a radio signal then receives the reflected RF signal back from the ground to determine the altitude of the aircraft. The R/T sends computed altitude data out on two ARINC 429 data buses to user systems on the aircraft.
The flight crew and other airplane systems use the altitude data during low altitude flight, approach, and landing.
The system has a range of -12 to 2500 feet.
An adjustable radio minimums alert operates with the radio altitude system and is independently selectable from 0 to 999 feet on the captains and first officers EFIS control panels. The radio minimums altitude selection is compared and processed in the display electronics units (DEUs) with the existing radio altitude value output from the radio altitude R/T. When the airplane descends to the selected radio minimums altitude a flashing radio minimums alert is displayed on the applicable DU.
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RA SYSTEM GENERAL DESCRIPTION General The altitude data and signal validity is sent on two... RA SYSTEM COMPONENT LOCATION... General...
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