Furuno FEA-2107-BB - Expected Steering Performance under Critical Failure; Lost Heading from Autopilot (ECDIS May also Have Lost Heading); Lost Heading from ECDIS (Autopilot Still Has Heading)

30. Steering With TOKYO KEIKI Autopilot PR-6000
30-28
30.9 Expected Steering Performance Under Critical
Failure
Below is a summary of the system behaviour in various failures when the Goto OS or Goto AW steering mode is in
use.
Note: The backup navigator alarm is activated if the alarm is not acknowledged within 30 seconds. For more
information about this alarm, see section 31.7 Description of Backup Navigator Alarm.
30.9.1 Lost heading from Autopilot (ECDIS may also have lost
heading)
Associated alarms Expected system performance What end operator
should do
Immediately
• Sensor alarm "4055: Gyro
error (Trackpilot)" is
generated at ECDIS.
• Warning lamp RC turns on.
Mode lamp indicators AUTO
and RC start flashing in
autopilot control panel.
• If ship is in linear part, Rudder
order is frozen for last value in
order to approximately continue
ahead.
• If ship is turning, rudder order is
frozen for last value in order to
approximately continue rate of
turn.
• Change immediately to
manual control of
rudder.
• Acknowledge alarms.
• Study situation.
Within few
seconds
• Alarm "2497 Route Stop-
Sensor fail.
• Alarm "2471 RC/NAV-TC
STOP - Use AUTO" on
ECDIS".
• Change immediately to
manual control of
rudder.
• Acknowledge alarms.
• Study situation.
Repeated
every 2
minutes
• Alarm "2498 Use manual
rudder control" is generated
at ECDIS.
• Reminder • Change immediately to
manual control of
rudder.
30.9.2 Lost heading from ECDIS (Autopilot still has heading)
Associated alarms (generated
at ECDIS
Expected system performance What end operator
should do
• Sensor alarm, for example
Alarm "4005: Gyro error" or
"4006: Gyro error."
• Acknowledge alarms.
• Study situation.
Within few
seconds
• Alarm "2002 No heading
available".
• Alarm "2497 Route Stop-
Sensor fail".
• Acknowledge alarms.
• Study situation.
After Alarm
"2497 Route
Stop-Sensor
fail."
• Alarm "2471 RC/NAV-TC
STOP - Use AUTO" in
ECDIS is generated. Warning
lamp RC turns on and
steering mode indicator lamp
RC start flashing in Autopilot
control panel
• If ship is in linear part, actual
heading is used as set course.
• If ship is turning, last-set course
and radius are used to complete
the turn.
• Acknowledge alarms
• Study situation.
• Change steering mode
to "AUTO".