- Electronic HSI System that electronically displays information found on conventional
electromechanical HSI units
- Can display additional information such as navaid/waypoint locations, bearing/distance
map-like display, expanded compass scale, mode annunciation, ground speed, time-to-go,
and diagnostic messages
- Can be used as stand-alone system but also provides lateral and vertical deviation
outputs to a flight control system such as Collins APS-65 Autopilot System
- Uses input data from VOR/localizer/glideslope receivers, compass system, DME, flight
control system, RNAV, vertical nav system, two ADF systems (one only w/ -001 HPU-74),
LORAN (N/A w/ -001 HPU-74), TACAN (N/A w/ -001 HPU-74)
- Large, easy-to-interpret, 4"x4" EHSI display
- Mode and NAV source annunciation
- Data labeling using color coordination and positioning
- On-off control of bearing pointers
- Detented selected heading and course knobs allow 1-degree increments for small, precise
changes
- Heading synchronize function allows automatic slew of heading bug to lubber line
- Direct-to-course function allows automatic slew of active or preset course arrow direct
to station or waypoint bearing
- Remote selected course and selected heading controls
- Self-diagnostics
- Fast system warmup time
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