Phl local controller observes a C550 runway excursion during IFR WX conditions.

Attributes
ACN	532873
Time
Date	200112
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	agl single value : 0
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : charter
Make Model Name	Citation I/SP
Operating Under FAR Part	Part 135
Flight Phase	landing : roll
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller radar : 24
ASRS Report	532873
Person 2
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Events
Anomaly	excursion : runway inflight encounter : weather other anomaly
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Airport Weather
Primary Problem	Flight Crew Human Performance

Narrative:

Aircraft checked in on my frequency and was issued the RVR, wind, and landing clearance. Watching the asde (poor visibility), I observed aircraft on lng roll and advised him to turn left and hold short of the parallel. I observed aircraft reaching the end of the runway. I advised him to stop. The aircraft ran off the end of the runway and went into the grass.

Original NASA ASRS Text

Title: PHL LCL CTLR OBSERVES A C550 RWY EXCURSION DURING IFR WX CONDITIONS.

Narrative: ACFT CHKED IN ON MY FREQ AND WAS ISSUED THE RVR, WIND, AND LNDG CLRNC. WATCHING THE ASDE (POOR VISIBILITY), I OBSERVED ACFT ON LNG ROLL AND ADVISED HIM TO TURN L AND HOLD SHORT OF THE PARALLEL. I OBSERVED ACFT REACHING THE END OF THE RWY. I ADVISED HIM TO STOP. THE ACFT RAN OFF THE END OF THE RWY AND WENT INTO THE GRASS.

Data retrieved from NASA's ASRS site as of July 2007 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.