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.
When used in conjunction with ATC instructions, gives the pilot
the latitude to delay compliance until a condition or event has
been reconciled. Unlike "pilot discretion," when instructions are
prefaced "when able," the pilot is expected to seek the first
opportunity to comply. Once a maneuver has been initiated, the
pilot is expected to continue until the specifications of the
instructions have been met. "When able," should not be used when
expeditious compliance is required.