Definition
An incorrect pilot response to a course deviation indicator (CDI) on an ILS or VOR display, in which the pilot maneuvers the aircraft in the direction opposite to the needle's deflection, increasing the deviation from the desired course or glide path rather than reducing it.
Plain English
Steering the aircraft the wrong way when the needle on the instrument moves off-center, so the aircraft drifts further from the correct path instead of returning to it.
Context Anchor
Seen during localizer and ILS discussions, especially when flying a back-course approach or another localizer situation where reverse sensing can occur.
Why Pilots Care
This error increases course deviation, destabilizes the approach, and raises the risk of a missed approach or unsafe landing.
Grounding Statement
When the signal is sensed backward, the safe correction is opposite the needle movement.
Intuition Check
Do not assume the needle always shows the direction to steer. In normal sensing you fly toward the needle; in reverse sensing you fly away from the needle.
Example Sentence 1
The student was flying away from the needle on the localizer, drifting steadily right of centerline until the instructor called for a correction back to the left.
Example Sentence 2
During the approach briefing the instructor warned against flying away from the needle on either the localizer or glideslope.