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22 - ATPL - Once established on the NAT contingency parallel track offset by 5 NM, if the aircraft remains in the NAT level band, the vertical offset should normally be:

Question 22 - Operational Procedures - ATPL - Airline Transport Pilot license

300 ft from the normally used flight levels.
1 000 ft at all levels.
500 ft from the normally used flight levels, or 1 000 ft if above FL 410.
No vertical offset if the aircraft can maintain its assigned level.

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