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I don't think the IR needs to be current to start a type rating
This came up some months ago, prompted by a statement in LASORS to the effect that an IR was 'valid' for 5 years after the last LPC had expired but current for 1 year. When challenged, the CAA backed down and admitted that the 'DEFINITIVE' guide was wrong (again) and an IR is valid for only 1 year, as clearly stated in JAR-FCL 1.185.