TM 1-1520-238-T-4
4–66
Change 1
4–13.
POWER PLANTS – MAINTENANCE OPERATIONAL CHECK (ENGINE 2) (cont)
4–13
Task
Result
k. On CPG master caution/warning panel,
press and hold PRESS TO TEST indicator.
Check that ENGINE CHOP indicator is
lighted.
If ENGINE CHOP indicator is not lighted, replace
lamp ( (TM 1-1520-238-23). If lamp still does not light,
refer to TM 1-1520-238-T-6 to troubleshoot CPG
caution/warning system.
l. On pilot instrument panel (fig. 4–34) dim test
panel, place DGT OFF/NORM/TST switch to
TST. Check that NG, TGT, ENG–RTR,
TORQUE and ENG OIL indicators show full
scale readings for 3 seconds. Check that
digital displays show 888.
If NG, TGT, ENG–RTR, TORQUE and ENG OIL
indicators do not go to full scale for 3 seconds or do
not show 888, refer to TM 1-1520-238-T-5 to
troubleshoot engine instruments.
m. On CPG instrument panel (fig. 4–35) dim
test panel, place DGT OFF/NORM/TST
switch to TST. Check that NG, TGT,
ENG–RTR, TORQUE and ENG OIL
indicators light and/or that LEFT/FWD and
RIGHT/AFT digital displays show 888 on
CPG SDD panel.
If NG, TGT, ENG–RTR, TORQUE and ENG OIL
indicators do not light or CPG SDD panel does not
show all 888, refer to TM 1-1520-238-T-5 to
troubleshoot engine instruments.
n. On pilot power quadrant (fig. 4–26), move
engine NO 2 PWR lever to OFF. Place
engine NO 2 start switch to IGN OVRD.
Check cockpit ECS outlets for loss of air
flow and the engine 2 accelerates to and
remains between 23% and 25% NG on the
pilot instrument panel. After 30 seconds
place engine NO 2 start switch to OFF.
If engine 2 does not accelerate to or remain between
23% and 25% NG, go to paragraph 4–36.
If air flow from ECS does not stop, go to
paragraph 4–56.
NOTE
If step n. was successfully performed using external power –
pressurized air, go to step o.
If step n. was successfully performed using the on–board PAS, go to
step r.
o. Start and operate APU (TM 1-1520-238-CL).
p. Remove external power – pressurized air,
only (TM 1-1520-238-23).
