TM 1-1520-240-10
2-3-15
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
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 differ-
ence 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 differ-
ence 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 shut-
down
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 Re-
versionary
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 Pri-
mary 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 Pri-
mary and Reversionary
N/A
Abort Mission
FF
(on Pre-start
BIT check)
N/A
N/A
Move PRI/REV
switch to PRI.
Then cycle back-
up power
Continue Mission
if 88
