What is the rule of 3 top of descent?


What is the rule of 3 top of descent? In aviation, the rule of three or 3:1 rule of descent is a rule of thumb that 3 nautical miles (5.6 km) of travel should be allowed for every 1,000 feet (300 m) of descent. For example, a descent from flight level 350 would require approximately 35x3=105 nautical miles.


What is a good rate of descent?

In general, a comfortable rate of descent for a fit person is 500 feet per minute.


What does TOC mean in aviation?

Top Of Climb (TOC). An identifiable waypoint representing the point at which cruise altitude is first reached. TOC is calculated based on your current aircraft altitude, climb speed, and cruise altitude.


What is the rule of 3 in aviation?

A general rule of thumb for initial IFR descent planning in jets is the 3 to 1 formula. This means that it takes 3 NM to descend 1,000 feet. If an airplane is at FL 310 and the approach gate or initial approach fix is at 6,000 feet, the initial descent requirement equals 25,000 feet (31,000–6,000).


How do pilots know when to descend?

In modern aircraft with modern avionics, the descent profile is automatically calculated by the computers. When prevailing winds are entered the flight management system can accurately determine the top of descent and the rate of descent that is required.


What is the 1 2 3 rule in aviation?

Many pilots refer to this as the 1-2-3 rule: Plus or minus 1 hour from arrival, ceilings at least 2,000 feet and visibility at least 3 statute miles.