Expected Steering Performance Under Critical Failure - Furuno FMD-3200 Operator's Manual

24.8.3

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 from Autopilot and/or lost heading from ECDIS
Immediately • These alerts and
warnings may be gen-
erated at the ECDIS:
1) Alert "255 Gyro 1
COM Error"
2) Alarm "450 Head-
ing Sensor Not Avail-
able"
3) Warning "902 No
Filter Source of COG/
SOG"
4) Warning "903 No
Filter Source of
Heading"
• The EMRG ALARM
lamp on Autopilot con-
trol panel goes on.
Within a few • Alert "153 Track Con-
seconds trol Stop"
• Alert "156 Sensor
Failure"
• Alert "665 Auto Pilot
Mode Conflict"
Repeat every • Alert "675 Use MAN
2 minutes Steering" is generat-
ed at the ECDIS.
Related
alerts
• 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.
• Guidance for the navi-
gator
24. OPERATION WITH AUTOPILOT PT-500A
Expected system
performance
Operator
action
• Change immediately to
manual control of rud-
der.
• Acknowledge alerts.
• Monitor situation.
• Change immediately to
manual control of the
rudder.
• Acknowledge alerts.
• Monitor situation.
• Change immediately to
manual control of rud-
der.
24-15