T-34C INSTRUMENT NAVIGATION WORKBOOK
TRAFFIC IN SIGHT - Used by aircraft to inform a controller that previously issued traffic is in
UNABLE - Indicates inability to comply with a specific instruction, request, or clearance.
VECTOR - A heading issued to an aircraft to provide navigational guidance by radar.
VERIFY - Request confirmation of information; e.g., "VERIFY ASSIGNED ALTITUDE."
WHEN ABLE - When used in conjunction with ATC instructions, gives the aircrew the latitude
to delay compliance until a condition or event has been reconciled. Unlike for "pilot discretion,"
when instructions are prefaced with "when able," the aircrew is expected to seek the first
opportunity to comply. Once a maneuver has been initiated, the aircrew is expected to continue
until the specifications of the instruction have been met. "When able" should not be used when
expeditious compliance is required.
WILCO - I have received your message, understand it, and will comply with it.
A-6 GLOSSARY OF COMMUNICATION TERMS