AFTER STARTING APU (CONT)

TM 1-1520-238-MTF Change 4 2-50 PROCEDURE TROUBLESHOOTING REFERENCE AFTER STARTING APU (CONT) (3) Perform FD/LS test 02. Leave RTR BK switch at BRAKE. (4) DEK – STBY. (5) Verify normal trim and interrupt functions with trim switches on both pilot and CPG cyclics. Leave trim feel on. *c. BUCS Self Test. CAUTION Do not execute BUCS test or control sweep unless rotor is completely stopped. (1) RTR BK switch – BRAKE. (2) Controls – Friction off, centered and cleared. NOTE During both PLT and CPG BUCS test, the crew should be aware that the flight controls will move. If the BUCS FAIL warning light il- luminates during either test, do not fly the helicopter. (3) BUCS TST switch – PLT and hold. BUCS ON caution light should go out in approximately 20 seconds. Release switch and wait for 15 seconds to see if the BUCS FAIL warning light illuminates. If not, proceed to step (4).