What are the takeoff minimums for Part 121 and 135?
Part 121, Part 125, Part 129, and Part 135 MinimumsOne or two engines: one statute mile of visibility; no ceiling minimum. Three or more engines: one-half statute mile of visibility; no ceiling minimum. Helicopters: one-half statute mile of visibility; no ceiling minimum.
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(1) For day operations—1,000-foot ceiling and one-mile visibility. (2) For night operations—1,000-foot ceiling and two-mile visibility.
The lowest routinely used takeoff visibility minimum is 600 feet RVR, which is about one-tenth of a mile. Pretty low. It's the lowest visibility typically used in simulator training for taxi and takeoff practice.
Commercial Part 121/135 operators have the following standard takeoff minimums: One and two engines: one-mile visibility (1 mile)Three or more engines: one-half mile visibility (1/2 mile)
§ 121.481 Flight time limitations: One or two pilot crews.(a) A certificate holder conducting flag operations may schedule a pilot to fly in an airplane that has a crew of one or two pilots for eight hours or less during any 24 consecutive hours without a rest period during these eight hours.
14 CFR Part 121 permits landing or takeoff by domestic scheduled air carriers where a local surface restriction to visibility is not less than 1/2 statute mile, provided all turns after takeoff or before landing and all flights beyond 1 statute mile from the airport boundary can be accomplished above or outside the ...
§ 135.265 Flight time limitations and rest requirements: Scheduled operations. (1) 1,200 hours in any calendar year. (2) 120 hours in any calendar month. (3) 34 hours in any 7 consecutive days.
Part 121 is scheduled air carrier (airliners). Part 133 is external load (helicopter) operations. Part 135 is a set of rules with more stringent standards for commuter and on-demand operations. Part 135 operator rules govern commercial aircraft.