TM 55-2840-231-23
MAIN ROTOR DOES NOT ROTATE BY
30% N1 SPEED DURING START
SHUT DOWN, ENSURE THAT THE OIL
BEING USED IS MIL-L-7808F OR G,
OR MIL-L-12699. REPEAT START
PROCEDURE. IF NOT ROTATING AF-
TER SECOND ATTEMPT, SUSPECT
DIRT OR SAND BETWEEN FOURTH
STAGE TURBINE WHEEL AND
SHROUD.
BLOW OUT THROUGH EXHAUST
STACK WITH COMPRESSED AIR.
MAKE THIRD START ATTEMPT TO
VERIFY CORRECTIVE ACTION.
NO
v
AIRCRAFT POWER TRAIN SEIZURE
TM 55-1520-228-23
NO
+
REPLACE ENGINE
TM 55-1520-214-23/
TM 55-1520-228-23
Change 13
1-129
