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9 - ATPL - The validity period of a night-time organised track system in NAT HLA (North Atlantic High Level Airspace) is normally at 30°W, between:

Question 9 - Operational Procedures - ATPL - Airline Transport Pilot license

11H30 UTC to 18H00 UTC
10H30 UTC to 19H00 UTC
00H00 UTC to 08H00 UTC
01H00 UTC to 08H00 UTC

Training tests and timed exam simulations ATPL - Airline Transport Pilot license