TM 1-1520-240-MTF
4-62
b. Verify proper response of CDU panel
lighting to aircraft BRT and DIM controls.
Adjust to comfortable level.
c. Perform DGNS system Start-Up procedure.
Ensure four (4) satellite measurements
(SAT) are being used and estimated
position error (EPE) is 50 (metes) or less
with keys loaded or 200 (meters) or less with
a cold start.
d. Fly helicopter over surveyed test course
consisting of two (2) waypoints used as
checkpoints (CP) a minimum of 20 KM
apart.
e. To minimize errors in establishing positions
over the checkpoints (CP), the altitude shall
be the lowest compatible with safety
standard.
f. If checkpoint (CP) information was not
entered through the data loader during
Star-Up, enter checkpoints using the CDU.
g. Set MODE switch to MGRS or LAT/LONG.
h. Set DISPLAY switch to XTK/TKE. Observe
standard Cross Track (XTK) and Track
angle error (TKE) display.
i. Depress GPS/DOP select button on HSI
Mode Select Panel.
j. To display Fly-To destination depress the
INC key or DEC key, or depress the first
number key and the second number key.
