TM 55-2840-241-23
Table 4-1. Troubleshooting (Continued)
Trouble
Prubable cause
Remedy
25
Engine N1
a. Faulty N1 tachometer,
a. Replace tachometer generator or
or indicator.
indicator. (Refer to TM
55-1520-228-23.)
b. Gas producer fuel
b. Check position of max speed stop
control not properly set.
screw.
c. Faulty gas producer
c. Replace fuel control. (Refer to
fuel control.
para 5-12.)
a. Gas producer fuel
a. Check linkage for proper
control or power turbine
operation and adjustment. (Refer to
governor linkage not
para 5-12 and 5-13.)
properly set.
NOTE
During ground run after overspeed incident, note the idle speed with the
twist grip at 30 degree position. If idle speed is notmal, suspect the governor
- if idle speed is high, suspect the gas producer fuel control as the family
27
Excessive echaust
torching during
start and transients.
28
Slow to accelerate
from idle to power.
b. Defective gas producer
fuel control or power
turbine governor.
c. Faulty N2 tachometer,
or indicator.
a Fuel nozzle
b. Excessively rich gas
producer fuel control.
c. Leaking accessory
bleed lines.
a. Dirty compressor.
b. Foreign object
damage; eroded blades,
vanes, or plastic coating.
c. Compressor case
misaligned when installed.
d. Loose pneumatic fittings.
e. Excessive generator
load.
f. Excessive compressor
air leakage.
g. Bleed control valve
b. Replace defective control or
governor. (Refer to para 5-12 a
5-13).
c. Replace tachometer generator or
indicator. (Refer to TM
55-1520-228-23.)
a. Replace fuel nozzle. (Refer to
para 5-15.)
b. Replace control. (Refer to para
5-12.)
c. Repair or replace lines.
a. Clean Compressor. (Refer to para
7-3.)
b(1). Replace the compressor case if
damaged, or if erosion exceeds the
acceptable limits. (Refer to Chapter
7.)
b(2). If compressor assembly is
damaged replace engine. (Refer to
TM 55-1520-228-23.)
c. If noise monitoring indicates rub,
remove and reinstall the case. (Refer
to para 8-2.)
d. Tighten a replace as required.
e. Reduce electrical load.
f. Check for leaks and repair.
g. Replace bleed control valve.
(Refer to para 5-33.)
Change 14 4-9
