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2 - ATPL - In the NAT HLA (North Atlantic High Level Airspace), a pilot should first of all take the following action in the event of a failure of the last inertial navigation system:

Question 2 - Operational Procedures - ATPL - Airline Transport Pilot license

Set a different heading approximately 45° from the previous one
Request authorisation from Control to track another aircraft
Immediately climb or descend 1000'
Notify Air Traffic Control and wait for a reply within a reasonable time

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