442704/A
299
Accessing the inside of the installation trunk
Topics
Accessing the installation trunk by lowering the transducer, page 299
Accessing the installation trunk by lifting the hull unit, page 301
Accessing the installation trunk by lowering the transducer
To do a visual inspection of the inside surface of the installation trunk you need access.
Access is also required to inspect and or replace the sacrificial anodes. This access can be
achieved by lowering the transducer as far as it goes.
Prerequisites
The vessel is in dry dock. The ST90 system is turned off. The shipyard must provide all
necessary tools and manpower.
You need a suitable screwdriver or a large coin to open the Motor Control Unit cabinet.
You also need a 4 mm Allen key.
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.
Context
On larger hull units, the hoist motor is provided with a motor brake. The motor brake must
be released before the transducer is manually lowered or hoisted.
Note
When not in use, the hand crank must always be placed inside the Motor Control Unit.
When removed from its storage position the hand crank releases a safety switch which
disables hull unit operation.
The transducer is covered with a thick red or black protective coating made of a special
plastic type. The protective coating is a vital part of the transducer. It is very important that
neither this coating nor the internal parts of the transducer are damaged during the handling,
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