ICA
1500-SERIES-ICA-1
Revision A - 01/22/2009
Page
15
of
15
Instructions for
Continued Airworthiness
7.0 Troubleshooting
Table 7.1 – Troubleshooting
SYMPTOM PROBABLE
CAUSE
ACTION
Annunciator light on when
engine is not running.
DPS stuck in closed position.
Replace DPS.
Annunciator “flickers” at all
power settings.
Filter element is partially
clogged.
Monitor engine instruments. Do
not select
ALT AIR
to
OPEN
if TOT
is within limits.
Annunciator light on at all
power settings.
Filter element is dirty.
Select
ALT AIR
to
OPEN
only if TOT
for power required exceeds limits
while still in harsh environment.
Select
ALT AIR
to
OPEN
when in
clean air. Clean filter element
before next mission.
Annunciator light stays
when
ALT AIR
switch is set
to
OPEN
.
Actuator failed in retracted
position.
Replace actuator.
Annunciator light on at high
power with known clean
filter element installed.
Probable turbine section
degradation.
Out of Limits DPS
Carry out engine power check.
Conduct functional test of DPS.
