286
442704/A
8
Make sure that the transducer cables can move freely when the transducer is lowered
and hoisted.
9
[Bridge]
: Hoist the transducer to its upper position.
Related topics
Maintenance procedures, page 186
Preventive maintenance, page 272
Preventive maintenance schedule, page 273
Preventive maintenance procedures, page 278
Environmental requirements, page 655
Visual inspection of the installation trunk
All surfaces that are in contact with seawater are exposed to marine growth (biological
fouling). This includes the hull plating, the blister and the installation trunk. Marine growth
inside the installation trunk can damage the transducer. Excessive marine growth on the hull
plating close to the transducer can cause noise. Every time your vessel is in dry dock, you
must remove the marine growth.
Prerequisites
The vessel is in dry dock. The ST90 system is turned off. Neither tools nor instruments are
required for the visual inspection.
• Relevant tools are required to remove marine growth and to apply anti-fouling paint. All
tools must be provided by the shipyard.
• Anti-fouling paint must be provided by the shipyard.
Note
Do not
direct high-pressure water or sandblasting spray towards the transducer. This
will damage the transducer beyond repair.
Two persons are needed to do the task.
• One person must stay in the sonar room to operate the hull unit.
• One person must stay in the dry dock, under the hull, to make sure that the transducer is
not lowered too far down.
Proper oral communication must exist between the sonar room and the dry dock personnel.
Procedure
1
Make sure that all power to the hull unit is disconnected.
Simrad ST90 Reference Manual
Summary of Contents for Simrad ST90
Page 1: ...kongsberg com simrad Simrad ST90 REFERENCE MANUAL ...
Page 2: ......
Page 337: ...442704 A 335 Related topics Sonar views page 326 User interface ...
Page 413: ...442704 A 411 Related topics Menu system page 375 Display menu page 384 Menu system ...
Page 631: ...442704 A 629 Related topics Concept descriptions page 626 Concept descriptions ...
Page 687: ......
Page 688: ... 2021 Kongsberg Maritime ISBN 978 82 8066 211 8 ...
Page 689: ......
Page 690: ...Reference Manual Simrad ST90 ...