Pilots of “heavy” and “super” aircraft are required to announce their category at the end of their call sign. This helps ATC and reminds everyone that these airplanes need more space than other categories.
Why do pilots say rotate when they take off?
Summary. Long story short, pilots say rotate as a verbal queue that the aircraft has reached its predetermined Vr and hence appropriate inputs can be applied to safely pitch the aircraft in a nose-up attitude to gain lift.
Why do pilots say tree instead of three?
Aviators often speak “pilot English” to avoid miscommunications over radio transmission. “Tree” for instance, means three, “fife” is the number five and “niner” means nine, says Tom Zecha, a manager at AOPA. The variations stemmed from a desire to avoid confusion between similar-sounding numbers, he says.
