Unintentional deselection of a DP control function
- DP Event
- Published on 30 June 2016
- Generated on 8 November 2026
- DPE 02/16
- 1 minute read
Observation
Jump to:
Vessel operators should note that this type of event continues to occur and might consider whether additional barriers should be put in place.
Considerations
- This event highlights the possible consequences of deselecting critical DP system buttons. Significant changes to any system should not be made during critical phases of an operation.
- It was considered highly likely that the DPO was performing multiple tasks when the surge button was unknowingly deselected.
- Tools are available within position reference systems to monitor vessel position and alarm if the vessel moves outside a set limit.
- Vessel operators should note that this type of event continues to occur and might therefore consider whether additional barriers should be put in place for critical switches.
Latest DP incidents
-
Watch what you are pressing
While transiting away from a wind farm, the Master of a DP equipment class 2 vessel observed that the vessel was operating in Backup Mode and queried this with the bridge team and attending electrician
DPE 03/26
19 October 2026
Incident
-
The domino effect
The event demonstrates the importance of maintaining the approved DP power configuration, addressing known defects before equipment is relied upon during DP operations, and ensuring DP personnel understand how changes to the generating arrangement can affect redundancy and failure propagation
DPE 03/26
19 October 2026
Incident
-
Lost in calibration
During activity associated with calibration of a vessel Vertical Reference Unit (VRU), the DP control system experienced degradation of its attitude reference arrangement. Shortly afterwards, the vessel generated an Off Position Warning followed by an Off Position Alarm
DPE 03/26
19 October 2026
Incident
-
The UPS and downs
While a vessel was transiting in DP mode, the DPO observed the loss of Gyros 2 and 3 together with alarms from a 230V backup power supply. The telephone system remained powered but was inoperable.
DPE 03/26
19 October 2026
Incident
-
DP drill scenario – Consequence Analysis Class DP2 & DP3
DP drill scenario – Consequence Analysis Class DP2 & DP3
DPE 03/26
19 October 2026
Drill Scenario
The case studies and observations above have been compiled from information received by IMCA. All vessel, client, and operational data has been removed from the narrative to ensure anonymity. Case studies are not intended as guidance on the safe conduct of operations, but rather to assist vessel managers, DP operators, and technical crew.
IMCA makes every effort to ensure both the accuracy and reliability of the information, but it is not liable for any guidance and/or recommendation and/or statement herein contained.
Any queries should be directed to DP team at IMCA. Share your DP incidents with IMCA online. Sign-up to receive DP event bulletins straight to your email.