Narrative:

Runway 22 at lex has a crown on it where runway 26 intersects. This crown causes a visual illusion that affects mental picture of closure rate; runway width and length; especially when landing at night. If you land prior to the 'hump;' you tend to land hard as runway 'rises' into you. If you land after the 'hump;' there is a threat/hazard of floating down the remainder of the runway; which is only 7000 feet to begin with; as runway slopes away from you. Add in some limited visual cues and reduced braking action and there is potential for runway excursion. Is the runway slope within certification requirements? If so; should requirements be reviewed to consider nighttime illusions or a note added to airport remarks? Runway 26 needs to be looked at also for visual illusions associated with runway lighting that may not be visible beyond the crowned intersection.

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Original NASA ASRS Text

Title: THE RWY 4/22 CROWN ABOVE THE RWY 22 APCH END CREATES AN OPTICAL ILLUSION CONDUCIVE TO HARD OR LONG LNDGS.

Narrative: RUNWAY 22 AT LEX HAS A CROWN ON IT WHERE RUNWAY 26 INTERSECTS. THIS CROWN CAUSES A VISUAL ILLUSION THAT AFFECTS MENTAL PICTURE OF CLOSURE RATE; RUNWAY WIDTH AND LENGTH; ESPECIALLY WHEN LANDING AT NIGHT. IF YOU LAND PRIOR TO THE 'HUMP;' YOU TEND TO LAND HARD AS RUNWAY 'RISES' INTO YOU. IF YOU LAND AFTER THE 'HUMP;' THERE IS A THREAT/HAZARD OF FLOATING DOWN THE REMAINDER OF THE RUNWAY; WHICH IS ONLY 7000 FEET TO BEGIN WITH; AS RUNWAY SLOPES AWAY FROM YOU. ADD IN SOME LIMITED VISUAL CUES AND REDUCED BRAKING ACTION AND THERE IS POTENTIAL FOR RUNWAY EXCURSION. IS THE RUNWAY SLOPE WITHIN CERTIFICATION REQUIREMENTS? IF SO; SHOULD REQUIREMENTS BE REVIEWED TO CONSIDER NIGHTTIME ILLUSIONS OR A NOTE ADDED TO AIRPORT REMARKS? RUNWAY 26 NEEDS TO BE LOOKED AT ALSO FOR VISUAL ILLUSIONS ASSOCIATED WITH RUNWAY LIGHTING THAT MAY NOT BE VISIBLE BEYOND THE CROWNED INTERSECTION.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.