8.1 Naval Class Surveys will determine the material
condition of the ship and confirm that it should remain efficient
until the next survey. Although the Regulations refer to specific
survey intervals, it should be noted that these intervals are flexible,
and could be extended if adequate evidence is provided for a justification
for the extension. It is therefore possible that Surveyors may be
requested to predict the time at which efficiency will be impaired
for certain structures, so that the Navy can plan future maintenance
in conjunction with the operational needs.