26. AUTOPILOT OPERATIONS
26-32
26.10.3 Expected steering performance under critical failure
Below is a summary of the system behavior in different failures in the GoSEA or
GoAW steering mode.
Lost heading to Autopilot
*1
PT-500A: EMRG ALM; PR-6000: RC; FAP-2000, FAP-3000, PR-9000: ALARM
Related
alerts
Expected system
performance
Operator
action
Immediately • These alerts and
warnings may be gen-
erated at the ECDIS:
1) Alert "30601 Head-
ing Sensor Not Avail-
able"
2) Alert "30510 No Fil-
ter Source of COG/
SOG"
3) Alert "30510 No Fil-
ter Source of Head-
ing"
• The lamp
*1
on the Au-
topilot’s Steering Con-
trol Unit (or Control
Panel) lights.
• Acknowledge alerts.
• Monitor situation.
Within a few
seconds
• Alert "153 Track Con-
trol Stop"*
*Transferred to BN-
WAS if not acknowl-
edged within 30
seconds.
• Alert "156 Sensor
Failure"
• Alert "30851 Auto Pi-
lot Mode Conflict"
TCS stops and
• If the ship is running
straight, the rudder or-
der is frozen at the last
value to approximately
continue ahead.
• If the ship is turning, the
rudder order is frozen at
the last value to approx-
imately continue the
rate of turn.
• Acknowledge alerts.
• Monitor situation.
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