TM 55-1520-240-23-10
16-125
EAPS TROUBLESHOOTING
16-125
INITIAL SETUP
Applicable Configurations:
All
Personnel Required:
Aircraft Repairer
NOTE
The EAPS fault isolation chart identify
the most probable malfunctions of
EAPS.
TROUBLE
PROBABLE CAUSE
REMEDY
Excessive accumulation of
contaminants (sand/dust) inside
of EAPS or at intake
a.
Seals improperly seated
NO BREAK - WORK HARDER
b.
Seals damaged, cracked, or torn
NO BREAK - WORK HARDER
c.
Bypass doors were opened during
operation
a.
Check and adjust seating of seals
NO BREAK - WORK HARDER
b.
Replace seals
NO BREAK - WORK HARDER
c.
Check item 6 in this guide
Scavenge blower does not operate
a.
No power to blower assembly
NO BREAK - WORK HARDER
b.
Defective blower assembly
NO BREAK - WORK HARDER
c.
Defective electrical wire harness
a.
Check aircraft electrical system
NO BREAK - WORK HARDER
b.
Replace blower assembly
NO BREAK - WORK HARDER
c.
Replace electrical wire harness
Scavenge blower has excessive
vibration
a.
Impeller blade has excessive or
uneven wear
NO BREAK - WORK HARDER
b.
Blower assembly loose or not
properly installed
NO BREAK - WORK HARDER
c.
Defective blower assembly
a.
Replace impeller
NO BREAK - WORK HARDER
b.
Check blower assembly installation
NO BREAK - WORK HARDER
c.
Replace blower assembly
Both bypass doors will not open
a.
No power to door actuators
NO BREAK - WORK HARDER
b.
Defective electrical wire harness
a.
Check aircraft electrical system
NO BREAK - WORK HARDER
b.
Replace electrical wire harness
Either bypass door does not open (one
door opens/ one does not)
a.
Bypass door actuator defective
a.
Replace bypass door actuator
EAPS warning light comes on
a.
Inlet tubes blocked or damaged
NO BREAK - WORK HARDER
b.
Differential pressure switch is
defective
a.
Clean or replace damaged tubes
NO BREAK - WORK HARDER
b.
Replace differential pressure switch
FOLLOW-ON MAINTENANCE:
As Required
END OF TASK
16-386
