TM 1-1520-238-MTF
2-30
PROCEDURE
TROUBLESHOOTING
REFERENCE
AFTER STARTING APU (CONT)
b. VID SEL switch check:
(1) PNVS – Verify pilots display
present.
(2) TADS – Verify TADS symbology
displayed.
c. SIGHT SEL switch – TADS. Verify
turret slews to fixed forward,
FORWARD message displayed in
HOD High Action Display.
d. Autodrift null check:
(1) SLAVE switch – Unslave.
Observe turret for any
uncommanded tendency to drift
or drive. When it appears to
decrease to a minimum or stop,
depress SLAVE switch. Verify
turret returns to fixed forward.
(2) SLAVE switch – Unslave. Slew
turret to an easily observed
target.
(3) FOV select switch – N. Note
any remaining uncommanded
drift.
NOTE
If turret drift is not minimized to an accept-
able level during the autodrift null proce-
dure, perform the manual drift null proce-
dure. Refer to Chapter 4, paragraph B.
