The 1 - 3 - 6 Rule for IFR Flight Planning. predominant weather at your ETA through 1 hour after ETA must be equal to or greater than the military weather planning minimums for the approach you intend to fly at that destination.
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If at anytime the pilot is unable to climb or descend at a rate of at least 500 feet a minute, advise ATC.
If a usable precision approach is available: 600' ceilings AND 2 SM of visibility. If only a non-precision approach is useable: 800' AND 2 SM of visibility. If no instrument approaches are available: Descent from the MEA and landing must be conducted under basic VFR.
The 40:1 surface is calculated out to 22.09 nautical miles from the runway end within an arc of 180° centered along the runway centerline extended. These requirements are part of FAR Part 77.23(a)(3). This is TERPS criteria. The standard aircraft departure climb gradient (CG) is 200 feet per nautical mile.
IFR flying is astronomically more challenging than VFR flying, but those pilots who achieve this distinction are invariably more equipped to fly IFR and VFR. Aviating under IFR, a pilot is authorized to fly into clouds in what is called zero visibility. All of the VFR-pilot privileges also apply.
Typical takeoff air speeds for jetliners are in the range of 240–285 km/h (130–154 kn; 149–177 mph). Light aircraft, such as a Cessna 150, take off at around 100 km/h (54 kn; 62 mph).
All airplanes have six basic instruments: airspeed indicator, attitude indicator, altimeter, turn coordinator, heading indicator, and vertical speed indicator.
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.