CHIEF MATE EXAM ORAL QUESTIONS AND ANSWERS - LATEST QUESTIONS | Page 170

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Periodical survey is applicable only for CARGO SHIP SAFETY EQUIPMENT CERTIFICATE and CARGO SHIP SAFETY RADIO CERTIFICATE. The survey is held within three months
before or after the second anniversary date or within three months before or after
the third anniversary date in the case of the cargo ship safety equipment certificate
and should take the place of one of the annual surveys and within three months
before or after each anniversary date in the case of the cargo ship safety radio
certificate. For all other certificates (other than passenger ship safety construction certificate) second or third annual survey is considered as an intermediate survey. The main difference between these two survey is, during intermediate survey only specified items are being surveyed, but during periodical survey (more thorough)inspection of all items relate to a specific certificate is carried out  to ensure that they are in a satisfactory condition and fit for the service for which the ship is intended. ( only difference between periodical and renewal survey is, after the renewal survey a new certificate is issued )