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105 - ATPL - For three- and four-engined aeroplanes, the take-off alternate, if required, shall be located (in still air conditions) within:

Question 105 - Operational Procedures - ATPL - Airline Transport Pilot license

2 hours flight time at cruising speed with all engines operating.
2 hours flight time at one-engine-inoperative cruising speed.
1 hour flight time at cruising speed with all engines operating.
1 hour flight time at one-engine-inoperative cruising speed.

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