The referenced appendix is too long to post. you can find it at
www.caap.gov.ph
(h)
Validity.
Subject to compliance with the requirements specified in this Part, the validity
period of an IR (A) is 1 year.
(i)
Renewal:
(1)
For the renewal of a single-engine instrument rating the applicant shall within the
preceding 12 calendar months, complete proficiency check on the subjects listed
in IS 2.3.3.6 Appendix B.
(2)
For the renewal of a multi-engine instrument rating the applicant shall within the
preceding 12 calendar months, complete proficiency check on the subjects listed
in IS 2.3.3.6 Appendix B.
(3)
If a pilot takes the proficiency check required in this section in the calendar month
before or the calendar month after the month in which it is due; the pilot is
considered to have taken it in the month in which it was due for the purpose of
computing when the next proficiency check is due.
(j) Re-issue. If the instrument rating has been expired the applicant shall:
(1)
have received refresher training from an authorized instructor with an
endorsement that the person is prepared for the required skill test; and
(2) pass the required skill test on the subjects listed in IS 2.3.3.6 Appendix B.