Definition
On an instrument approach chart, a grey shaded line is a charting symbol used to depict the visual segment of an approach procedure — the portion between the published missed approach point or visual descent point and the runway threshold, which must be flown visually. It indicates a known obstacle penetration of the visual segment surface, alerting the pilot that obstacles exist along the visual path to the runway and that descent below the published minimums must be made with continuous visual reference to the runway environment.
Plain English
It is a grey line drawn on an approach chart between the visual descent point (or missed approach point) and the runway. It is a warning that obstacles stick up into the visual path to the runway, so once you leave the published minimums you have to fly the rest visually and watch out for those obstacles.
Context Anchor
Seen on instrument approach charts and in handbook discussions about changing from instrument guidance to a visual approach near the airport.
Why Pilots Care
It tells the pilot the precise location where visual contact with the runway environment becomes the primary means of navigation and descent.
Grounding Statement
When you see the grey shaded line, picture it as the chart saying, “This is the visual path you are expected to recognize and follow once you can proceed visually.”
Intuition Check
Do not assume the grey shaded line is just decoration. In this context, it is a charted visual path or visual segment reference, not a full instrument course guarantee.
Example Sentence 1
During the briefing, the captain pointed out the grey shaded line on the approach chart and reminded the first officer to stay above the visual glidepath until the runway was in sight.
Example Sentence 2
The grey shaded line on the chart confirms the point at which instrument guidance ends and visual references take over.