Kongsberg Simrad SN90 Reference Manual page 293

Note
A hull unit may be provided as an option. It allows you to lower and hoist the transducer.
All information and tasks related to the hull unit and installation trunk may be
disregarded and omitted if the SN90 system is installed without a hull unit.
Context
The upper parts of the hull unit include the mechanical gantry, the hoist motor, the
hoisting spindle and the Motor Control Unit. The transducer shaft is supported by the
gantry, and penetrates the mounting flange. The transducer cable is placed inside the
transducer shaft. The transducer is mounted to the bottom of the transducer shaft. The
complete assembly is mounted on the top of the installation trunk.
Note
The hull unit is heavy. Appropriate lifting equipment (lifting tackle, portable crane or
ship's crane) is required. You must always use appropriate lifting equipment to minimize
risk of injury to personnel or damage to equipment. Only certified equipment must
be used.
The upper parts of the hull unit include the mechanical gantry, the hoisting motor, the
hoisting spindle and the junction box. The transducer shaft is supported by the gantry,
and penetrates the mounting flange. The transducer cable is placed inside the transducer
shaft. The transducer is mounted to the bottom of the transducer shaft. The complete
assembly is mounted on the top of the installation trunk.
Note
A hull unit may be provided as an option. It allows you to lower and hoist the transducer.
All information and tasks related to the hull unit may be disregarded and omitted if the
SN90 system is installed without this unit.
Procedure
1 Make sure that the SN90 system is turned off.
2 Preparations:
a Make sure that none of the cables prevent you from lifting the hull unit.
Disconnect relevant cables.
381294/E
Maintenance procedures
291