Aero-Terms are designed to be a daily reminder of the terms,
names, acronyms and explanations of the unique language that
populates the aviation world. Aerospace, sport aviation, fixed
wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of
the terms you may use every day, or an introduction to an aspects
of the Aero-World you may not yet be familiar with. ANN also
encourages readers to go beyond the FMI link, and further research
any intriguing terms.
A safety alert issued by ATC to aircraft under their control if
ATC is aware the aircraft is at an altitude which, in the
controller's judgment, places the aircraft in unsafe proximity to
terrain, obstructions, or other aircraft. The controller may
discontinue the issuance of further alerts if the pilot advises
he/she is taking action to correct the situation or has the other
aircraft in sight.