2.1.1 The due date
of the Tailshaft Survey, when a part of Naval Class, should be commensurate
with the Docking/ Special Survey. It is especially important that,
when this item is overdue or due, the examination should be held.
However, if it is seen that the Tailshaft Survey will become due before
the date of the next anticipated dry-docking, the advisability of
carrying out the survey at the current dry-docking should be discussed
with the Owner/Naval Authority.