Fixation and omission.

Bottom line

Staring at the heading indicator throughout a turn instead of maintaining a cross-check of other pertinent instruments is an example of a cross-check error. An omission error is the failure to anticipate significant instrument indications following attitude changes, such as concentrating on pitch control while forgetting heading or roll information, resulting in erratic control of heading and bank. It is a natural tendency to rely on the instrument that is most readily understood, even when it provides erroneous or inadequate information, and reliance on a single instrument is poor technique.