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Maintenance procedures
Preventive maintenance
Preventive maintenance schedule
In order to secure a long and trouble-free operation of the ST90 system, certain specific preventive maintenance tasks must be done. The tasks are organized in a preventive maintenance schedule.
Actions to be taken during dry docking
When the vessel is in dry dock you must take the opportunity to inspect and clean the transducer.

About this manual
The purpose of this publication is to provide the descriptions, procedures and detailed parameter explanations required to allow for safe and efficient use of the ST90 system. The publication also provides you with a thorough understanding of the parameters and adjustments provided by the ST90 system.
Simrad ST90
Operating procedures
Maintenance procedures
- Lowering and hoisting the transducer from the sonar room
- Setting up the interfaces to peripheral devices
- Inserting the installation parameters
- Installing and maintaining software
- Testing the noise conditions and the sonar functionality
- Preventive maintenance
  - Preventive maintenance schedule
    In order to secure a long and trouble-free operation of the ST90 system, certain specific preventive maintenance tasks must be done. The tasks are organized in a preventive maintenance schedule.
    - Actions to be taken before each use
      We recommend that you do these simple tasks each time you shall use the ST90 system.
    - Actions to be taken every month
      Once a month we recommend that you inspect and clean the various main units comprised by the ST90 system.
    - Actions to be taken during dry docking
      When the vessel is in dry dock you must take the opportunity to inspect and clean the transducer.
    - Actions to be taken whenever required
      The hull unit was lubricated as a part of the production process. It was thus provided fully lubricated when delivered to the vessel. Additional lubrication of the hull unit must only take place when required.
  - Requirements for personnel and tools
    All tasks can be done by the crew.
  - Approved anti-fouling paints
    The list of approved anti-fouling paints can be found on our website. Always refer to the manufacturer's documentation and data sheets for a complete procedure and for relevant safety information.
  - Preventive maintenance procedures
  - Accessing the inside of the installation trunk
User interface
Menu system
Functions and dialog boxes
Concept descriptions
Technical specifications
The technical specifications summarize the main functional and operational characteristics of the ST90 system. They also provide information related to power requirements, physical properties and environmental conditions.
Datagram formats
The ST90 system can send and receive information to and from several different peripherals. All transmissions take place as datagrams with data sentences. Each datagram has a defined format and length.
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Actions to be taken during dry docking

When the vessel is in dry dock you must take the opportunity to inspect and clean the transducer.

Do a visual inspection of the transducer.
Clean the transducer and remove marine growth.
If necessary, apply anti-fouling paint as described in the dedicated procedure.
Make sure that all surfaces under the hull are protected with a high quality coating.
Make sure that the inside of the installation trunk is also protected with coating.
Inspect the physical conditions of the sacrificial anodes. Check for damage and corrosion. If necessary, replace the sacrificial anodes with new anodes of the same (or similar) type.