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 TB 55-1900-201-45/1
Section III, some of the particular points which have been the source of trouble in the past and to which special attention
should be given in carrying out a hull examination.
E-4. When in the course of such an inspection, one or more of these deficiencies are encountered, the inspector must
first evaluate if seaworthiness is compromised or not. This calls for considerable discretion because the line of demarca-
tion between what is seaworthy and what is not, is necessarily approximate and subject to some range of interpretation.
The following factors must be weighed in making this determination:
a. The extent and degree of deterioration.
b. Whether the deterioration is currently active or has been arrested in whole or in part by protective action.
c. The period of time involved before the next scheduled inspection of the area in question. Certain areas are
accessible to inspection at every drydocking whereas other areas are only exposed during the surveys required by the
classification societies. A progressing condition which may be acceptable in one area would not be acceptable in another
without repair or, at least, without a pending requirement for further inspection at a prescribed future date.
d. Whether the repair work contemplated is necessary to restore seaworthiness or is a maintenance measure to
insure prolonged utilization of the vessel. In the first case, repair must be required. In the second case, the details of the
condition should be reconsidered at a future inspection and, possibly, called to the attention of the owner so that he may
exercise his own good judgment.
E-5. Once a decision has been reached by the inspector that repair is necessary, the specific requirement detailing the
nature and extent of the work should be written. The general rule is to "renew as original", i.e., to replace the defective
structure so as to restore its original design and condition. However in cases where the necessity for repair apparently
stems from an unsatisfactory structural feature, this feature should be corrected in making the repairs. As an example,
following unsatisfactory service experience, square hatch corners have been required to be modified, by provision of ra-
diused insert plates. Where such a need for design modification exists, plans covering the change should normally be
prepared and approved before the work is undertaken, insofar as practicable.
E-6. In some instances, the owner may desire to reduce the structural work corresponding to renewal in kind by provision
of supplementary nature of repairs involving extensive renewals, it is evident that consideration should be given to such
alternate means of repair proposed by the owner, or by the shipyard in his behalf if they are
E-2
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