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E2 DECU T1 sensor soft
fault.
N/A N/A Continue Mission
E3 DECU N2A sensor soft
fault.
N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
E4 DECU N2B sensor soft
fault.
N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
E5 DECU N2 sensor difference
soft fault.
N/A N/A Abort Mission
F1 DECU N1A sensor soft
fault.
Unable to restart the engine in
Primary
N/A Continue Mission
F2 DECU N1B sensor hard/
soft fault.
With or without REV light
May be unable to start in
N/A Abort Mission
F3 DECU N1A sensor difference
soft fault.
N/A N/A Abort Mission
F4 DECU fuel flow pot soft
fault.
Without FADEC light
Unable to restart the engine in
Primary
FADEC light if engine is shutdown
N/A Continue Mission
F4 DECU fuel flow pot hard
fault.
With FADEC light
Unable to start in Primary
N/A Abort Mission
F5 DECU step count hard
fault.
FADEC light
Unable to start in Primary
N/A Abort Mission
F6 DECU PLA pot soft fault. REV light
Unable to start in Primary and
Reversionary
N/A Abort Mission
F7 DECU HMA bleed valve
solenoid hard fault.
FADEC light
Bleed band inop
N/A Abort Mission
F8 HMA PRI/REV solenoid
hard fault.
FADEC light
Unable to start in Primary.
May not be able to start in Reversionary
N/A Abort Mission
F9 HMA Alternator soft fault. N/A N/A Continue Mission
FA Start fuel solenoid/ignition
system soft fault.
May be unable to start in Primary
and Reversionary
Ensure that the
ignition lock
switch in in the
ON position
Continue Mission
FB DECU Reversionary step
count soft fault.
May be unable to start in Primary
and Reversionary
N/A Abort Mission
FF
(on Pre-start
BIT check)
N/A N/A Move PRI/REV
switch to PRI.
Then cycle backup
power
Continue Mission
if 88
TM 1-1520-240-10
2-3-16
Table 2-3-1. T55-GA-714A DECU BIT Fault Code List/Matrix (Continued)
DECU Fault
Code(s) Fault Operational Effect Pilot Action Mission Impact
FF
(all other
BIT checks)
DECU internal fault. N/A N/A Abort Mission
Hex Display
Blank
(on Pre-start
BIT check)
N/A N/A Move PRI/REV
switch to PRI.
Then cycle backup
power.
Continue Mission
if 88
Hex Display
Blank
(all other
BIT checks)
DECU internal fault. N/A N/A Abort Mission
2-3-41. Engine Air Particle Separator (EAPS).
The engine air particle separating system (EAPS)system
protects the engine from harmful effects of dust and sand
erosion, snow and foreign objects and salt spray fouling
and corrosion. The system removes contamination from
the air and exhausts it overboard continuously using a
scavenge system. The EAPS assembly is mounted on
rails which enable it to be easily moved to permit engine
inspections. During flight, the assembly is locked in the
aft position against the engine inlet with two lock pins
installed through the rails at the forward mounting blocks
of the unit.
The basic axial flow of contaminated air entering the
vortex tube is forced into a spiral flow by the fixed blades
of the EAPS fan. The swirling motion causes the heavier
dirt particles to be separated from the air stream by virtue
of their inertia. The particulate is thrown outwards to the
periphery of the vortex tube by centrifugal force, concentrated
into the scavenge air flow, and ducted away for
discharge. The bulk of the air flow, from which the particulate
has been separated, passes axially down the center
for the outlet tube.
The EAPS control panel, located on the overhead panel,
provides control of the EAPS with a FAN ON/OFF switch
and DOORS CLOSE/OPEN switch for each engine. The
switches are marked for ENG 1 and ENG 2 and receive
their power from the No. 1 and No. 2 28-volt DC buses
through the NO 1 EAPS and NO 2 EAPS FAN CONT
circuit breakers. When the FAN switch is placed in the
ON position, the fan is operating and providing particulate
separation to that engine. Power to operate the fans
is provided by the No. 1 and No. 2 115-volt AC buses
through the NO 1 EAPS and NO 2 EAPS FAN circuit
breakers on the respective PDP’s.
The EAPS has a high electrical power requirement. Because
of this, both EAPS fans should not be turned on
simultaneously. Allow 10 - 15 seconds between the first
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