A terrain awareness system provides LOOK-AHEADLOOK-DOWN as well as LOOK-UP terrain advisory and warning indications to the pilot of an aircraft of a hazardous flight condition. An array of parallel in, parallel out registers is configured to receive parallel data from the serial in, parallel out data register and move the data in a parallel fashion between the parallel in, parallel out registers thereof. Then, bidirectional scanning of the voice data to a next token within the voice data is enabled, such that navigation to pertinent locations within the voice data during playback is facilitated. A front surface of the second door is positioned to be generally coplanar with at least a portion of a front surface of the first door.