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).
