What does FL 350 mean in aviation?
What does FL 350 mean in aviation? A commercial aircraft on a so-called IFR flight, i.e. all passenger planes, will cruise eastbound at so-called odd flight levels. That means for example at 33,000 feet (which pilots and air traffic control will refer to as FL330) or 35,000 feet (FL350) in increments of 2,000 feet.
What does FL180 mean?
Flight levels are then assigned a number which is the apparent altitude (pressure altitude) to the nearest thousand feet, divided by one hundred. Therefore an apparent altitude of 18,000 feet is referred to as Flight Level 180.