NVR-9000S

Common issues

• Microphone or audio channel faults that leave gaps in the recorded bridge audio
• A navigation sensor input such as position, heading or speed not being stored because of an interface or cable fault
• Fault in the storage unit or recording medium that stops or corrupts data retention
• Backup battery or power supply failure, so the recorder does not keep recording during a main power loss
• Time synchronisation drift against the ship's navigation systems
• Expired battery in the locator beacon of the float-free or fixed capsule

Inspection checklist

• Check the latest annual performance test report is on board and still in date
• Play back a recent recording and confirm that audio and sensor data are present and time-stamped correctly
• Check every connected data source against the interface list of the installation
• Inspect the capsule or storage unit, its mounting and its marking for damage and corrosion
• Check the expiry date of the locator beacon battery
• Test the backup power and the alarm that warns of a recording fault
• Inspect cables and connectors at the bridge unit and microphones
• Confirm that the save function works and that the operators know how to preserve data after an incident

Service intervals

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Spare fuses for the bridge unit
• Bridge microphone and cable set
• Cables and connectors for the data inputs
• Locator beacon battery of the correct type
• Storage medium as recommended by the maker

Safety

• Data can be overwritten after an incident if the save function is not used in time, so crews must know the procedure
• A recorder that has stopped recording without an alarm gives a false sense of security until the next annual test
• Electrical hazard when opening the bridge unit or the backup power - isolate before servicing

Class survey

Class and port state control expect a valid annual performance test certificate and a MED type approval certificate for the recorder. The surveyor may ask to see a playback to confirm that audio and the required sensor data are being recorded.

Estimated lifetime: Not meaningfully expressed in running hours; simplified voyage data recorders are generally expected to stay in service for 10-15 years with the annual test and timely replacement of batteries and storage media.