The approach minimums require at least 2400 RVR. So, when the visibility falls below 2400 RVR or 1/2 sm, you need to file for a takeoff alternate.
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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.
The Runway Visual Range (RVR) for Category I operations are between 550 metres (1800 feet) and 800 metres (2600 feet) for ICAO and FAA, depending on the conditions of the approach and equipment.
Reportable values are RVR6,000 feet or less. When it is determined from a reliable source that the indicated RVR value differs by more than 400 feet from the actual conditions within the area of the transmissometer, the RVR data is not acceptable and must not be reported.
Essentially, the pilots have until the aircraft attains the V1 airspeed to abort the take-off. Beyond V1, the pilots are committed and have to take off as they would not be able to stop the aircraft safely within the remaining runway distance.
A: The 80-knot call is to ensure that both airspeed indicators are functioning and indicating properly. The rudder is becoming effective at that speed, too. Q: Do any runways come to mind that are too short to abort a takeoff having almost reached takeoff speed? — Jeff, Stuart, Fla.
The reduced takeoff thrust procedure increases engine durability, lowers maintenance costs, and increases engine reliability. The airliners we have today are highly overpowered as they are designed to safely take off with one engine inoperative.