Three minutes or the appropriate radar separation when takeoff will be behind a super aircraft; Two minutes or the appropriate radar separation when takeoff will be behind a heavy aircraft.
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Between aircraft departing in the same direction from different runways whose centerlines are parallel and separated by at least 3,500 feet, authorize simultaneous takeoffs when the aircraft will fly diverging courses immediately after takeoff.
As part of the testing of a new aircraft, the manufacturer must demonstrate that all passengers can be evacuated in a short amount of time when an emergency arises - within 90 seconds to be precise. If it doesn't comply, the aviation authorities won't approve its safety certification.
The easiest way to find if an airport has takeoff minimums is to look at an approach chart. On the FAA charts, you will see a black triangle with “T” in it which is often called the “troubled T.” It's troubling because there is something, most likely terrain, keeping pilots from executing a leisurely climb.
The lowest routinely used takeoff visibility minimum is 600 feet RVR, which is about one-tenth of a mile. Pretty low. It's the lowest visibility typically used in simulator training for taxi and takeoff practice.
In aviation medicine, the 1% rule is a risk threshold that is applied to the medical fitness of pilots. The 1% rule states that a 1% per annum risk (See also risk management) of medical incapacitation is the threshold between acceptable and unacceptable.
This is especially true for the critical aircraft – the Boeing 737-900 which requires a landing length of 6,800 feet under wet conditions and a takeoff length of 9,700 feet under maximum takeoff weight.
Trivia: There are only 3 airports outside the US with 4 parallel runways: LFPG (Paris Charles de Gaulle Airport), LFTM (Istanbul Airport) and ZSPD (Shanghai Pudong International Airport).