TM 1-1520-238-10
4-41
4.24.2 TADS Equipment Data.
TADS equipment data
is contained in figure 4-16 and table 4-13.
Table 4-13.
TADS Equipment Data
Parameter
Function
Normal Azimuth Operating Range
+120 degrees/
–120 degrees
Azimuth Stow Position
–180 degrees
Elevation Operating Range
+30 degrees/
–60 degrees
Maximum Slew Rate (WFOV FLIR)
60 degrees
per second
Fields of View (diagonal measurement)
DVO
Wide
18.0 degrees
Narrow
4.0 degrees
DTV
Wide
4.0 degrees
Narrow
0.9 degree
Zoom
0.45 degree
FLIR
Wide
50.0 degrees
(identical to PNVS)
Medium
10.0 degrees
Narrow
3.1 degrees
Zoom
1.6 degrees
4.24.3 Operation Data.
a. Drift Null.
The TADS system has the capability to
null the turret servo drift by either of two methods. Servo
drift can be identified as happening when ever the TADS
turret is under manual control, the CPG is not making any
inputs with the thumbforce controller and the reticle ap-
pears to drift off the aim point. The aim point should re-
main within the narrow FOV of the DTV for 30 seconds. If
it does not, or a lesser amount of drift is desirable, adjust
as follows:
(1) Manual Servo Drift Null.
The manual servo
drift null procedure can be accomplished when the heli-
copter is on the ground or during flight. First, select DTV or
FLIR narrow FOV as the sensor; then aim the reticle at an
easily observed object. Place the Boresight Enable switch
in UP position and wait for at least 5 seconds; then use the
AZ and EL thumbwheels to null the turret drift. When the
servo drift is nulled, place the Boresight Enable switch in
CENTER position and the procedure is complete.
