Used in place of a radio altimeter (RA) receiver-transmitter (RT) primarily honeywell (formerly alliedsignal) model ALA-52B series RA RT, such as part n° 066-5007-0101. to permit an external radio altitude signal input on bus 1 and/or bus 2 during warning system. EFIS (Electronic Flight Instrument System), RA system, TCAS (Traffic Alert and Collision Avoidence System), or GPWS (Ground Proximity Warning System) maintenance system tests.
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