TM 11-5840-360-14-1-1
ATTACHMENT B
TBK CONVERSION INSTRUCTIONS
For conversion to the TBK system, the following steps are necessary to assure proper operation of the stepper motor
which provides compass information to the True Bearing Kit.
1.
Remove all power to the indicator and the gyro line.
2.
Locate and remove the three 25 watt resistors R1, R2 and R3. Note that these three resistors perform the same
function as R1, R2, and R3 in the NSK Assembly (A9) of the Indicator.
3.
Using the values listed for A9/R1, R2, R3 in Table A-2 of the NSK Conversion Instructions (Attachment A), select
the correct replacement resistor values and part numbers.
4.
Install the replacement resistors for R1, R2, and R3 in the TBK.
5.
Document component changes in the radar manual.
A-22
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