Table 4-1. Troubleshooting (Continued)
d. Sticking double check
e. Pc filter clogged.
f. Cracks in compressor
discharge air tubes or
outer combustion case.
g. Compressor discharge
air tube seal leaks.
h. Insufficient fuel
supply to gas producer
i. Insufficient fuel
pressure to fuel pump.
j. Anti-icing valve open
and cabin heat on.
k. Gas producer fuel
control start derichment
l. Gas producer fuel
control by-pass valve
m. Gas producer fuel
adjusted or calibration
n. Fuel nozzle partially
clogged with carbon.
o. Fuel nozzle check
valve stuck partially
p. Faulty power turbine
q. Dirty compressor.
r. Foreign object damage
or erosion to compressor.
s. Contaminated fuel
control fuel filter.
c. Replace as required. (Refer
d. Replace valve. (Refer to para
e. Check and clean Pc air filter.
(Refer to para 5-11.) Clogging may
be caused by dirt, moisture or ice.
f. Weld repair or replace parts as
applicable. If cracked compressor
g. Replace air tube seals. (Refer to para 3-21.1
h. Check fuel system to ensure all
valves are open and pumps are
i. Turn on aircraft boost pump,
j. Close anti-icing valve and turn off
k. Adjust start derichment. (Refer
to para 5-12.)
l. Disconnect the fuel line at the
fuel nozzle, flush system with clean
fuel. If the same condition still
exists, replace fuel control. (Refer to
m. Replace control. (Refer to para
n. Clean fuel nozzle. (Refer to para
o. Replace fuel nozzle. (Refer to
para 5-15. )
p. Replace governor. (Refer to para
q. Clean compressor and bleed
valve. (Refer to para 7-3 and 7-7. )
r. Inspect compressor. (Refer to para
7-9 or 7-10, )
s. Clean or replace the filter. (Refer
to para 5-12.)
Change 23 4-3
discharge air tubes or outer combustion
case is suspected, refer to TM 1-1520-254-23
Tecnical Manual Aviation Unit Main-
tenance (AUM) andAviation Intermediate
Maintenance (AVIM) Manual Nondestructive
Inspection Procedure for OH-58 Helicopter Series.