TM  10-3930-669-20 VISUAL INSPECTION (1) Start engine (TM 10-3930-669-10). (2) Observe drive axle oil cooler fans operation. (a)   If    drive    axle    oil    cooler    fans    do    not operate,  perform  Step  (3)  below  and  go to Step 8 of this Fault. (b)   If   drive   axle   oil   cooler   fans   operate, perform Step (3) below and go to Step 2 of this Fault. (3) Shut down engine. 2-333