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4 - ATPL - For an operation in NAT HLA (North Atlantic High Level Airspace) along notified special routes, unless otherwise specified, an aircraft must be equipped with at least:

Question 4 - Operational Procedures - ATPL - Airline Transport Pilot license

Two Inertial Navigation Systems (INS)
Three Inertial Navigation System (INS)
Two independent Long Range Navigation Systems (LRNS)
One Long Range Navigation System (LRNS)

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