Definition
A common instrument cross-check error in which the pilot fixates on one instrument — most often the attitude indicator — instead of systematically scanning the full panel. The result is that other instruments are under-checked, deviations go unnoticed, and control inputs are made on incomplete information.
Plain English
Staring at one gauge so much that you stop properly checking the others. You end up flying off what one instrument tells you, while missing changes happening elsewhere on the panel.
Context Anchor
Seen in instrument flying when learning or reviewing the instrument scan, especially during discussion of common cross-check errors.
Derivation
Emphasis comes from an older Greek word meaning to show or give special importance to something. Here, it means putting too much importance on one instrument instead of using all the needed instruments together.
Why Pilots Care
This fixation delays recognition of changes in other flight parameters and can quickly lead to loss of situational awareness or aircraft control.
Intuition Check
Do not read this as normal attention to an important instrument. The error is giving one instrument so much attention that the rest of the instrument picture is neglected.
Example Sentence 1
During the practice approach, the instructor noted the student's emphasis on a single instrument — the attitude indicator — and pointed out that heading and altitude had drifted unnoticed.
Example Sentence 2
During the ILS approach, emphasis on a single instrument led to unnoticed altitude deviations until the instructor pointed them out.