Definition
The traditional grouping of six primary cockpit instruments used to fly an aircraft by reference to instruments alone: the airspeed indicator, attitude indicator, altimeter, turn coordinator, heading indicator, and vertical speed indicator. Together they provide the pilot with continuous information about pitch, bank, yaw, altitude, vertical speed, airspeed, and heading.
Plain English
The six core gauges a pilot scans to know how the aircraft is flying when they cannot see outside. Each one shows a different piece of the picture, and together they tell the pilot everything needed to control the aircraft.
Context Anchor
Seen in instrument training when learning the instrument scan, cross-check, and how to control the aircraft by reference to instruments.
Derivation
Instrument comes from a Latin word meaning a tool or piece of equipment used to do a job. In aviation, a flight instrument is a tool that gives the pilot needed information about the aircraft’s motion, position, or direction.
Why Pilots Care
They form the minimum set of references needed to control the aircraft by instruments alone when visual references are lost.
Intuition Check
Do not read “basic” as meaning unimportant or beginner-only. Here, “basic” means these are the core references that support aircraft control during instrument flight.
Example Sentence 1
During instrument training, the student learned to scan the six basic flight instruments in a steady pattern rather than fixating on any single one.
Example Sentence 2
Loss of one of the six basic flight instruments requires immediate adjustment of the cross-check pattern.