RADIO ALTITUDE INDICATOR.
- 1. DH light.
- Flashes together with the DH light on the ADI when the indicated
altitude is less than the setting of the DH index.
- 2. DH index.
- Indicates the height at or below which the DH light will illuminate.
- 3. DH set knob.
- Sets the DH index. The setting will only affect the DH lights associated
with the particular indicator.
- 4. Test button.
- When depressed, the indicator shall read 100+/-5 feet and the warning flag
shall appear. The radio height bar on the ADI will be out of view.