Omission error is defined as...

• A. The failure to anticipate significant instrument indications following attitude changes; for example, concentrating on pitch control while forgetting about heading or roll information, resulting in erratic control of heading and bank.
• B. The failure to anticipate weather changes.
• C. The error of misidentifying a VOR signal.
• D. An assumption about wind direction.

Answer: (A)

Omission error occurs when you fail to notice important instrument indications after a change in attitude, causing you to focus on one parameter while neglecting others. This tunnel vision can mean concentrating on pitch control and forgetting about heading or bank, which leads to erratic or unstable control as the aircraft’s actual orientation drifts.

That is why the best answer describes the failure to anticipate significant instrument indications following attitude changes and gives the example of focusing on pitch while ignoring heading and bank. Other choices refer to different kinds of errors—weather changes, misidentifying a navigational signal, or incorrect wind direction assumptions—that aren’t about neglecting instrument indications after attitude changes.