Where an annual or an intermediate survey required in regulation 6 of Annex I of MARPOL
is not carried out within the period specified in that regulation,
the IOPP Certificate ceases to be valid. When a survey corresponding
to the requisite survey is carried out subsequently, the validity
of the Certificate may be restored without altering the anniversary
and expiry date of the original Certificate and the Certificate endorsed
to this effect. The thoroughness and stringency of such survey will
depend on the period for which the prescribed survey has elapsed and
the conditions of the ship.