Checking the hull unit lowering and hoisting functionality
The hull unit is used to lower the transducer down below the ship’s hull when the SU90 system shall be used. This is a key functionality of the SU90 system. It is very important that the hoist/lower function is tested before the SU90 system is put to operational use.
To test the lower and hoist functionality two tasks must be done at the same time.
Two persons are needed.
•  One person must stay on the bridge in order to operate the SU90 system.
•  One person must stay in the sonar room to make sure that the SU90 system starts, and that the hull unit works properly.
Proper oral communication must exist between the bridge and the sonar room.
Note
This test can only be done if the water depth allows the transducer to be lowered completely. If this is not the case, the vessel must be moved to another location, or the test must be cancelled. Kongsberg Maritime cannot take responsibility for tests that are cancelled for this reason.
Certain steps in the procedures are location specific. The steps marked [Sonar room] are done in the sonar room. The steps marked [Bridge] are done on the bridge.
Note
In the event of problems or malfunctions:
1 On the Motor Control Unit:Locate the Motor Protecting Switch (S301).
2 Set the switch to position OFF.
WARNING
The transducer may be damaged if it transmits in open air.