28. Trackpilot
28-28
28.9 Expected Steering Performance Under Critical
Failure
Below is a summary of system behavior in various failures when Program Track, Goto Waypoint or Goto Track
steering mode is in use.
Note: Backup navigator alarm is activated if alarm is not acknowledged within 30 seconds. For more information
about this alarm, see paragraph 9.7 “Description of Backup Navigator Alarm”.
28.9.1 Lost heading from Trackpilot (ECDIS may also have lost
heading)
Associated alarms Expected system performance What end user should do
Immediately
• Sensor alarm “4055: Gyro
error (Trackpilot)” is
generated at ECDIS.
• Alarm 10 is generated at
Trackpilot 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 “2496 ProgTrack
Stop-Sensor fail” or “2497
Route Stop-Sensor fail.
• Change immediately
to manual control of
rudder.
• Acknowledge alarms.
• Study situation.
Repeat
every 2
minutes
• Alarm “2498 Use manual
rudder control” is generated
at ECDIS.
• Reminder • Change immediately
to manual control of
rudder.
28.9.2 Lost heading from ECDIS (Trackpilot still has heading)
Associated alarms (generated
at ECDIS
Expected system performance What end user 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 “2496 ProgTrack
Stop-Sensor fail” or “2497
Route Stop-Sensor fail”.
• Automatic change of steering
mode to Radius Control mode.
• If ship is in linear part, actual
heading is used as set heading.
If ship is turning, last-set
heading and radius remain.
• Acknowledge alarms.
• Study situation.
To Next Page
Loading...
