An offshore support vessel (OSV) was underway to field loaded with cargo when a sudden drop of starboard main engine RPM was observed. The main engine dialog screen gave the error message <invalid throttle signals>. The engineers informed the bridge immediately. Investigation began; the onshore office and the client were also informed. With the client, it was decided to take the vessel back into port as a quick fix was not available.
What went wrong? What were the causes?
- The remote speed controller module had failed;
- The cause was overheating for a prolonged period;
- The root cause was assumed to be extremely unfavourable conditions (hot and humid) in the engine room, leading to unexpected and unpredictable failures of electronic components because of high temperatures.
- Crew should remain aware of and alert to the likelihood of unexpected equipment failure under extreme conditions of heat;
- Sufficient spares of potentially vulnerable electronic items should be carried and stored appropriately.
Our member started a fleet-wide study of the effects of high engine room temperatures on electronic control equipment.
IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of all. The effectiveness of the IMCA Safety Flash system depends on Members sharing information and so avoiding repeat incidents. Please consider adding [email protected] to your internal distribution list for safety alerts or manually submitting information on incidents you consider may be relevant. All information is anonymised or sanitised, as appropriate.
IMCA’s store terms and conditions (https://www.imca-int.com/legal-notices/terms/) apply to all downloads from IMCA’s website, including this document.
IMCA makes every effort to ensure the accuracy and reliability of the data contained in the documents it publishes, but IMCA shall not be liable for any guidance and/or recommendation and/or statement herein contained. The information contained in this document does not fulfil or replace any individual’s or Member's legal, regulatory or other duties or obligations in respect of their operations. Individuals and Members remain solely responsible for the safe, lawful and proper conduct of their operations.