AFTER STARTING APU (CONT)

TM 1-1520-238-MTF 2-34 PROCEDURE TROUBLESHOOTING REFERENCE AFTER STARTING APU (CONT) (2) FLTR SEL switch – Actuate to each available filter. Verify smooth switching of filters to selected mode. (3) AND – Observe for appropriate data display. Verify range of adjustment of AND rheostat control. (4) Optics check – Select each available FOV. Observe crosshair relationship to ‘‘Real World Image’’. Slew turret using thumbforce controller observing for any excessive crosshair rotation tendency. NOTE If display image is not reasonably upright, or if excessive crosshair rotation occurs during slewing, attempt to correct problem by per- forming the pechan alignment procedure. Refer to Chapter 4, paragraph C. h. FLIR sensor check: (1) Sensor select switch – FLIR. (2) LVL and GAIN controls – Adjust through full range of authority noting effectiveness. Adjust as required for optimum imagery.