The flight crew of the 737-300 manipulates sliding white plastic "bugs" to indicate critical takeoff and landing speeds. They consist of a "round dial" electromechanical airspeed indicator, altitude indicator, and vertical speed indicator. These instruments on the 737-300 are arranged in the basic "T" scan familiar to most flight crews. Superimposed over the navigation data on the EHSI are weather radar and traffic collision avoidance system (TCAS) targets. The EADI presentation includes autothrottle mode annunciation, autopilot mode annunciation, and vertical speed tape option. Some operators use electromechanical attitude direction instruments (ADI) rather than the CRT EADI. The 737-300 EFIS/MAP system (figure 1) uses CRT displays for the primary electronic attitude direction indicator (EADI) and for the electronic horizontal situation indicator (EHSI). In order to duplicate the functionality of the 737-300 flight deck, any change to its integral presentations had to be minimal in the following displays on the next-generation 737 flight deck:
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