| 1. Heading marker |
Enables pilot, by adjusting HDG SEL knob, to set marker to a desired
heading reference. |
| 2. Course pointer |
Indicates selected course. |
| 3. TO indicator |
Indicates selected course is in the direction, within plus or minus 90
degrees, of the course to the station. |
| 4. Bearing pointer number 1 |
Indicates bearing relative to a ground station (ADF-VOR), as determined by
the HSI Display Control Panel. |
| 5. COURSE indicator |
Provides selected course readout (in degrees) to indicate course pointer. |
| 6. NAV warning flag |
Indicates loss of radio navigational signal. |
| 7. GS flag |
Indicates loss or unreliable glideslope radio signal. |
| 8. Glideslope deviation pointer |
Indicates aircraft position relative to glideslope centerline. |
| 9. FROM pointer |
Indicates selected course is within plus or minus 90 degrees to the course
from the station. |
| 10. CRS SEL knob |
Manually adjusts, course pointer and COURSE readout, to set desired course
or track for VOR and LOC. |
| 11. Azimuth indicator |
Indicates aircraft heading. |
| 12. Aircraft symbol |
Provides immediate indication of azimuth relative to desired course and
course deviation. |
| 13. Course deviation bar |
Indicates aircraft deviation from desired VOR, LOC or FM course or track. |
| 14. HDG SEL knob |
Manually adjusts to selected desired aircraft heading. |
| 15 HDG flag (warning) |
Indicates loss of instrument power or directional gyro information is
invalid. |
| 16. Bearing pointer number 2 |
Indicates bearing relative to a ground radio station (ADF-VOR) as
determined by the HSI Display Control Panel. |
| 17 RANGE readout |
Indicate range to destination. |
