For an airplane multi engine commercial rating:
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If you are applying for a commercial pilot certificate with an airplane category and multi engine class rating, you must log at least 250 hours of flight time as a pilot (of which 50 hours, or in accordance with FAA Part 142, a maximum of 100 hours may have been accomplished in an approved flight simulator or approved flight training device that represents a multi engine airplane) that consists of at least:
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100 hours in powered aircraft, of which 50 hours must be in airplanes.
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100 hours of pilot in command flight time, which includes at least 50 hours in airplanes, and 50 hours in cross-country flight in airplanes.
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20 hours of training on the areas of operation as listed for this rating, that includes at least 10 hours of instrument training of which at least 5 hours must be in a multi engine airplane, 10 hours of training in a multi engine airplane that has a retractable landing gear, flaps, and controllable pitch propellers, or is turbine-powered, one cross-country flight of at least 2 hours in a multi engine airplane in day VFR conditions, consisting of a total straight-line distance of more than 100 nautical miles from the original point of departure, one cross-country flight of at least 2 hours in a multi engine airplane in night VFR conditions, consisting of a total straight-line distance of more than 100 nautical miles from the original point of departure.
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10 hours of flight time performing the duties of a pilot in command in a multi engine airplane with an authorized instructor on the areas of operation as listed for this rating, which includes at least one cross-country flight of not less than 300 nautical miles total distance and as specified, and 5 hours in night VFR conditions with 10 takeoffs and 10 landings (with each landing involving a flight in the traffic pattern) at an airport with an operating control tow
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