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91 - ATPL - For a twin-engine aeroplane, the standard operational take-off minimums may be used provided an alternate aerodrome is accessible at less than:

Question 91 - Operational Procedures - ATPL - Airline Transport Pilot license

30 minutes at cruising speed with one engine unserviceable.
30 minutes at cruising speed all engines running.
60 minutes at cruising speed with one engine unserviceable.
60 minutes at cruising speed all engines running.

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