TM 55-1520-228-10
Change 11 3-31
CONTROL/INDICATOR FUNCTION
1. LO SET Control Knob . . . . . . . . . . . . . . . . . . . . . . . . Turns facility on and off, and sets low altitude limit index.
2. LO Level Warning Flag . . . . . . . . . . . . . . . . . . . . . . . Indicates LO when altitude reaches respective limit index.
3. Low Limit Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manually sets low altitude limit index. Actuates LO level
warning flag when limit reached.
4. HI Level Warning Flag Indicates HI when altitude reaches respective limit index.
5. High Limit Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manually sets high altitude limit index. Actuates HI level
warning flag when limit reached.
6. Altitude Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indicates actual clearance in feet from helicopter to terrain
(zero to 1500 feet).
7. HI SET Control Knob . . . . . . . . . . . . . . . . . . . . . . . . .
Sets high altitude limit index and operates self-test mode.
Figure 3-16. Radar Altimeter
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