Aviation Terms->Duty Day
The amount of time legally allowed for the aircraft crew to perform flights and flight related duties in a 24 hour period. These duty limitations are put in place to avoid pilot fatigue. The time varies slightly based on factors such as domestic flights, international flights, and weather delays. Domestic Flight time: 8 hours in a 24 hour period. This can be increased to 10 hours with the use of a co-pilot. International Flight time: 12 hours in a 24 hour period. However, once the aircraft lands in the US, the 8 hour rule takes precedent. Duty time: 14 hours in a 24 hour day. This includes pre-flight and post flight operations of the aircraft. If a pilot can receive 10 hours of rest in between flights, he or she become new again, and their flight time clock re-sets itself to zero. The rule is a maximum of 8 hours in a 24 hour period. If the pilot flies beyond the 8 or 10 hour limit due to weather, the rest period increases to 16 hours instead of the normal 10 hours. Also, pilots can fly only six consecutive day in a row before they are required to take 24 hours off.