Plain English Meaning

Leaving an instrument out of your scan. Your eyes skip over it, so you stop getting information from it without realising.

Full Definition

A cross-check error in which the pilot fails to include one or more flight instruments in the systematic scan, leaving a gap in the information used to control the aircraft. Common examples include neglecting the heading indicator during a climb, or ignoring the slip/skid indicator during a turn.

Context Anchor

Seen in instrument flying when learning common errors in the instrument scan, especially while using traditional round-dial instruments.