Introduction
3 Open the unit, and using a vacuum cleaner, remove all dust
etc. from the unit. Great care m ust be taken to ensure the
circuit boards and modules are not damaged in the process.
Mechanical units
If a mechanical unit may has been exposed to a salt atmosphere
while it was in use, it must be thoroughly cleaned both internally
and externally to prevent c orrosion.
1 If the construction materials and type of unit permits, wash
the unit using a high-pressure hose and copious amounts
of fresh water. Examples are the lower parts of hull units
(outside the hull) or subsea units
2 Ensure that all traces of mud and marine growth are
removed. Use a wooden or plastic scraper to remove
persistent growth, barnacles etc. On completion, dry the
unit thoroughly.
Caution
Do not use a high pressure hose in the vicinity of
cables or transducers. Do not use sharp or metal
tools on a transducer face.
3 If the materials or type of unit prevents the use of a
high-pressure hose, wipe the unit using a cloth dampened
with water containing a little detergent. Examples are the
upper parts of hull units (inside the hull) and hydraulic
systems
4 Do not use excessive amounts of water as some components
on the unit may not be water tight. Wipe off the detergent
with a damp cloth, then dry the unit thoroughly.
5 All surfaces must be inspected for signs of corrosion,
flaking/bubbling paint, stains etc. Damaged or suspect
areas must be cleaned, prepared and preserved using the
correct preservation m ediums. The mediums to be used will
normally be defined in the unit’s maintenance manual.
Cables
Wipe clean all exposed cables, and check for damage. If a cable
shows signs of wear or ageing, contact Simrad for advice.
Internal batteries
If the unit contains batteries, these may discharge slowly during
storage. If the unit is to be stored for an extended period,
disconnect or remove all internal batteries.
304699/A
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