TM 1-1520-238-T-5
8–52
8–10.
ENGINE INSTRUMENTS – MAINTENANCE OPERATIONAL CHECK (cont)
8–10
Task
Result
p. On CPG dim/test panel (fig. 8–32), set DGT
OFF/NORM/TST switch to NORM, rotate
the manual DIM control fully
counterclockwise and then fully clockwise.
If the brightness of the CPG instrument vertical scale
indicators and digital readouts do not change, go to
paragraph 8–41.
q. On CPG dim/test panel, set DGT
OFF/NORM/TST switch to TST. Check all
CPG engine instruments digital readouts
and vertical scale indicators.
If all CPG engine instruments do not indicate full scale
or show digital 888, go to paragraph 8–42.
If CPG TORQUE indicator does not indicate full scale,
or show digital 888, or vertical scale indicators have
every other lamp not lighted, go to paragraph 8–43.
If CPG ENG–RTR RPM% indicator does not indicate
full scale or vertical have every other lamp not lighted,
go to paragraph 8–44.
If CPG SDD panel LEFT/FWD or RIGHT/AFT digital
readouts do not show digital 888, go to
paragraph 8–45.
r. On CPG dim/test panel, set DGT
OFF/NORM/TST switch to NORM.
If all CPG engine instruments digital readouts are
blanked, go to paragraph 8–46.
s. On CPG SDD panel (fig. 8–35), rotate
SELECT switch to OFF.
If CPG SDD panel digital readouts are not blanked
out, replace the SDD panel (TM 1-1520-238-23).
If CPG engine instrument indicators are not blanked
out, go to paragraph 8–47.
If CPG TORQUE indicator digital readouts are not
blanked out, go to paragraph 8–48.
t. Rotate SELECT switch to each of the
discrete clockwise positions and check the
respective LEFT/FWD and RIGHT/AFT
digital readouts. SDD indicators will light as
SELECT switch is rotated.
If any indicators do not light when selected, replace
the SDD panel (TM 1-1520-238-23).
If CPG SDD panel TGT digital readouts do not
indicate ambient temperature 5 when TGT indicator
lights, go to paragraph 8–49.
