Definition
The set of checks a pilot performs before an instrument flight to confirm that all required navigation, communication, and flight instrument systems on board the aircraft are present, powered, current, and functioning correctly for the type of operation planned.
Plain English
Before flying on instruments, the pilot goes through each system on the aircraft — radios, navigation receivers, flight instruments, autopilot, and so on — to make sure each one is working properly and is legal to use for the planned flight.
Context Anchor
Seen during instrument-flight preflight planning, cockpit setup, and required navigation instrument system inspection.
Derivation
Preflight combines “pre,” meaning before, with “flight.” In aviation, preflight means a deliberate check made before operating the aircraft, not just a casual look-over.
Why Pilots Care
Ensures navigation accuracy and prevents in-flight system failures that could compromise safety or regulatory compliance during IFR flight.
Intuition Check
Do not think of this as only the outside walk-around of the aircraft. Here, it means checking the aircraft’s flight and navigation systems before relying on them in the air.
Example Sentence 1
During systems preflight procedures, she confirmed the GPS database was current and that both navigation radios tuned and identified the local VOR.
Example Sentence 2
Completing the Systems Preflight Procedures confirmed that the attitude indicator and heading indicator were aligned and functioning for the planned IFR departure.