What factors must be taken into account when computing the 121 minimum fuel for a domestic flight?

§ 121.647 Factors for computing fuel required.
  • (a) Wind and other weather conditions forecast.
  • (b) Anticipated traffic delays.
  • (c) One instrument approach and possible missed approach at destination.
  • (d) Any other conditions that may delay landing of the aircraft.




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What is the primary distinction between these different parts of the regulations? Part 91 applies to general aviation and non-commercial operations(civil aircraft). Part 135 applies to commercial on-demand operations(such as private jets). Part 121 applies to large-scale scheduled commercial air carriers.

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IFR Fuel Requirements: Complete the flight to the first airport of intended landing; Fly from that airport to the alternate airport; and. Fly after that for 45 minutes at normal cruising speed or, for helicopters, fly after that for 30 minutes at normal cruising speed.

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§ 121.159 Single-engine airplanes prohibited. No certificate holder may operate a single-engine airplane under this part.

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Appropriately called Basic Scheme, this scheme follows well-known and standard fuel/energy planning with 5% contingency fuel, at least one nominated alternate and 30 minutes of final reserve fuel/energy. The usual caveats apply, including all AMCs for Basic Fuel Schemes.

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§ 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.

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