For reciprocating engine airplanes, how long does final reserve fuel allow for flight?

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Final reserve fuel is the amount of fuel that must remain on board the aircraft after reaching its destination and executing missed approaches, if necessary, to allow for safe landing or diverting to an alternate airport. In the case of reciprocating engine airplanes, regulatory requirements typically specify that the final reserve fuel must provide for 45 minutes of flight at a maximum continuous power setting, taking into account factors like fuel consumption rates.

This standard primarily aids in safety, ensuring that the aircraft has sufficient reserves to manage unexpected situations, such as needing to hold or circle before landing, or rerouting to a nearby airport. Therefore, if you consider the operational guidelines and safety regulations surrounding flight operations, the specification of 45 minutes for final reserve fuel aligns with these industry standards. This makes it a crucial part of flight planning and mass and balance considerations.

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