AIM - AIR 1. 7 - Jet and Propeller Blast Danger

Jet aircraft are classified into three categories according to engine size. The danger
areas are similar to those shown and are used by ground control personnel and pilots.
The danger areas have been determined for ground idle and take-off thrust settings
associated with each category.

Pilots should exercise caution when operating near active runways and taxiways. With
the use of intersecting runways, there is an increased possibility of jet blast or propeller
wash affecting other aircraft on an aerodrome. This can occur while both aircraft are
on the ground or about to take off or land. Pilots taxiing in close proximity to active
runways should be careful when their jet blast or propeller wash is directed towards an
active runway. Pilots operating behind a large aircraft, whether on the ground or in the
take-off or landing phase, should be aware of the possibility of encountering localized
high wind velocities.

No information is available for supersonic transport aircraft or for military jet aircraft.
Many of these aircraft are pure-jet aircraft with high exhaust velocities for their size
and may or may not use afterburner during the take-off phase. Thus, great caution
should be used when operating near these aircraft.