Pembroke
Skyyacht, A revalidation can be by "test" plus hours in the last year of the two years, but of those mentioned, only the IMC rating test would substitute for the instructor dual flight. A night rating or diferences training are not tests and do not require an examiner. Also the instrutor dual should be an opportunity to demonstrate acquired skills, not an abinitio flight on a new aircraft for the puposes of differences training.