TM 55-1520-228-10
k. N1 — 62–64 percent.
Do not have battery switch on and A PU sys tem
charging simultaneously for more than 2 min-
utes. This will prevent an unm onitored bat te ry
from overheating and possibly exploding.
*4. GPU — Disconnect; then BAT switch — BAT, if
required.
*5. N2 — Stabilized.
*6. THROTTLE ADJUST — 70 percent N1.
*7. GEN switch — GEN.
*8. DC amps — Check 60 or less before inverter is
turned on.
*9. INV switch — INV.
*10. Avionics — On.
8-18. ENGINE RUNUP.
*1. Engine and transmission instruments — Check.
*2. Thr o ttle — Slowly increase to open. Set N2 to
100 percent.
3. HEAT and DEICE systems — Check if use is
anticipated as follows, then set as required:
a. ENG DEICE — Check by moving the switch
toENGDEICE;checkforriseinTOT;thenOFF.TOT
should decrease.
b. PITOT HTR — Check by moving t he switch
to PITOT H TR; check for an incrase in DC AMPS; then
OFF. DC AMPS should decrease.
c. DEFOG & VENT — Check by moving the
switch to DEFOG & VENT; chec k for an increase in DC
AMPS; then OFF. DC amps should decrease.
d. HTR — Check by moving the switch to HTR;
Check for increase in TOT; then OFF. TOT should de-
crease.
4. Avionics — C heck as required.
5. Deleted.
*6. F lig ht I ns truments — Check and set as follows:
a. Attitude indicator — Horizon
A. ; Set 5 de-
grees above horizon to indicate level attitude at cruise
flight
C. .
b. Altimeter — Set and check.
(1) Barometric Altimeter — Set to current al-
timeter setting and check altitude error.
(2) Radar Altimeter — Test.
c. Heading indicators — Check and set.
*7. Doors, armor side panels and seat belts — Se-
cure.
8. Health indicator test (HIT) — Check. Refer to
HIT TOT log in the helicopter log book. Perform before
first flight of the day.
*9. Deceleration check. — Perform if required. See
Chapter 5, FUEL OPERATION LIMITS.
a. GEN switch — OFF.
b. N2 RPM — 100 percent. Stabilize 15 sec-
onds.
c. Throttle — Idle. Simultaneously start a time
count.
d. Stop as N1 passes through 65 percent.
NOTE
Multiple attempts may be required before pr
ofi-
ciency is obtained in timing the deceleration.
e. Check deceleration time. Minimum allowable
time is 2 seconds. If decelerat ion time
is less than 2
seconds, make tw o checks to con firm the time.
8-8 Change 14
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