tm 1-1520-240-10 technical manual operator's manual for army ch ...

Table 2-3-1. T55-GA-714A DECU BIT Fault Code List/Matrix (Continued)
TM 1-1520-240-10
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.
E4 DECU N2B sensor soft
fault.
E5 DECU N2 sensor difference
soft fault.
F1 DECU N1A sensor soft
fault.
F2 DECU N1B sensor hard/
soft fault.
F3 DECU N1A sensor difference
soft fault.
F4 DECU fuel flow pot soft
fault.
F4 DECU fuel flow pot hard
fault.
F5 DECU step count hard
fault.
N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
N/A N/A Abort Mission
Unable to restart the engine in
Primary
N/A Continue Mission
With or without REV light
May be unable to start in
N/A Abort Mission
N/A N/A Abort Mission
Without FADEC light
Unable to restart the engine in
Primary
FADEC light if engine is shutdown
With FADEC light
Unable to start in Primary
FADEC light
Unable to start in Primary
F6 DECU PLA pot soft fault. REV light
Unable to start in Primary and
Reversionary
F7 DECU HMA bleed valve
solenoid hard fault.
F8 HMA PRI/REV solenoid
hard fault.
FADEC light
Bleed band inop
FADEC light
Unable to start in Primary.
May not be able to start in Reversionary
N/A Continue Mission
N/A Abort Mission
N/A Abort Mission
N/A Abort Mission
N/A Abort Mission
N/A Abort Mission
F9 HMA Alternator soft fault. N/A N/A Continue Mission
FA Start fuel solenoid/ignition
system soft fault.
FB DECU Reversionary step
count soft fault.
FF
(on Pre-start
BIT check)
May be unable to start in Primary
and Reversionary
May be unable to start in Primary
and Reversionary
N/A N/A Move PRI/REV
switch to PRI.
Then cycle backup
power
Ensure that the Continue Mission
ignition lock
switch in in the
ON position
N/A Abort Mission
Continue Mission
if 88
2-3-15