If a NAT contingency requires a descent below FL 290 after the 5 NM parallel offset has been established, the aircraft should: - ATPL - 39

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Question 39 - Operational Procedures - ATPL - Airline Transport Pilot license

Return immediately to the cleared route centreline.

Use a 1 000 ft offset from all normally used flight levels.

Establish a 500 ft vertical offset from the flight levels normally used and proceed as required by the situation.

Use only SLOP and keep the assigned flight level.

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