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ground idle.
2-3-38. Starting Cycle, Aborting and Motoring.
714A
A starting cycle can be aborted at any time by moving the
ECL to STOP.
2-3-39. Power Assurance Test Switch. 714A
The primary FADEC will perform a BIT whenever the
PWR ASSURANCE TEST switch has been place to the
desired engine position. The switch is located below the
maintenance panel at station 524. The switch is label
1/OFF/2 and spring loaded to OFF. The results of the test
are displayed in the DECU BIT window.
2-3-40. Engine Wash System. 714A
The helicopter is equipped with an engine wash system
for each engine. Air and water connections are externally
mounted inboard of each engine work platform. A series
of spray nozzles are installed at the engine inlet and air
lines are routed to the bleed band actuator.
TM 1-1520-240-10
2-3-11
Table 2-3-1. T55-GA-714A DECU BIT Fault Code List/Matrix
The DECU fault code matrix will be consulted when anything other than 88 is displayed on the DECU Hex display during
the DECU Pre-Start, Start, or Shutdown BIT checks. The matrix lists DECU fault codes, type of fault, aircraft operational
effect, pilot actions require, and overall mission impact.
Abort mission is defined as: perform a normal engine shutdown and make appropriate entries on the DA Form
2408-13-1.
Continue mission is defined as: the crew may complete the present day’s mission but maintenance troubleshooting
actions are required prior to the next mission.
DECU Fault
Code(s) Fault Operational Effect Pilot Action Mission Impact
10 DECU internal hard fault. FADEC light
Aircraft won’t start in Primary
N/A Abort Mission
11 DECU internal hard fault. FADEC light
Aircraft won’t start in Primary
N/A Abort Mission
12 DECU internal soft fault. N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
13 DECU internal soft fault. N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
14 DECU internal soft fault. N/A N/A Continue Mission
15 DECU internal soft fault. N/A N/A Continue Mission
17 DECU internal soft fault. N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
18 DECU internal soft fault. Without FADEC light N/A Continue Mission
18 DECU hard fault. With FADEC light N/A Abort Mission
1B DECU internal soft fault. N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
1C DECU internal soft fault. Without FADEC light N/A Continue Mission
1C DECU hard fault. With FADEC light N/A Abort Mission
1E DECU internal hard fault. With FADEC light
Unable to start in Primary
N/A Abort Mission
1F DECU internal hard fault. FADEC light N/A Abort Mission
A1 DECU TQ soft fault. N/A Select PTIT
Check TQ AC/
DC CBs
Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
TM 1-1520-240-10
2-3-12
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
A2 DECU NR set soft fault. N/A N/A Continue Mission
A3 DECU thrust hard fault. REV light
Unable to start in Primary and
Reversionary
N/A Abort Mission
A4 DECU NR soft fault. N/A N/A Continue Mission
A5 DECU ECL soft fault. N/A N/A Abort Mission
A6 DECU emergency bus
soft fault.
N/A Check REV
CONT CB
If CB in, Continue
Mission
If CB out and
can’t reset, Abort
Mission
A7 DECU airframe bus soft
fault.
N/A Check PRI
CONT CB
Back-up power
ON
If CB in, Continue
Mission
If CB out and
can’t reset, Abort
Mission
B2 DECU internal N1B hard
fault.
With REV light,
Unable to start in Primary or
Reversionary
N/A Abort Mission
B2 DECU N1B soft fault. Without REV light N/A Continue Mission
B3 DECU N2B soft fault. Overspeed system compromised
Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
B4
(DECU Prestart
BIT
check)
DECU PTIT soft fault. N/A Perform REV
mode selected
start. Switch to
PRI when ground
idle is achieved.
Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
B4
(All other
DECU BIT
checks)
DECU PTIT soft fault. N/A N/A Continue Mission
B5 DECU thrust soft fault. Without REV light N/A Continue Mission
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