Taxiing traffic experiences a runway excursion under visibility reduced WX factors.

Attributes
ACN	205256
Time
Date	199203
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	ground other : taxi landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 20000 flight time type : 100
ASRS Report	205256
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Airport	other physical facility

Narrative:

Due to medical emergency flight ord/dtw 3/92, was taxiing back to the gate on 14L. WX conditions were low ceiling and visibility. Runway RVR 4000-6000. As we taxied down 14L we were instructed to turn right on 27R and hold short of the 32 parallel. Runway conditions were 14L covered with snow/slush, it had been plowed 1 1/2 hours prior, but it had been snowing the entire time. 27R was covered with snow and had not been plowed. Due to the visual references that I saw I started a turn thinking I was turning onto 27R. What I actually saw was the north side runway lights of 27R and the 14L runway lights aligning with the lights of 27R. The error was realized but not in time to stop the aircraft. The nose wheel exited the west side of 14L approximately 1 ft. The aircraft was shut down and assistance called. No damaged to aircraft or personnel. Once again due to poor and non standard runway/taxiway marking with poor visibility we have another incident.

Original NASA ASRS Text

Title: TAXIING TFC EXPERIENCES A RWY EXCURSION UNDER VISIBILITY REDUCED WX FACTORS.

Narrative: DUE TO MEDICAL EMER FLT ORD/DTW 3/92, WAS TAXIING BACK TO THE GATE ON 14L. WX CONDITIONS WERE LOW CEILING AND VISIBILITY. RWY RVR 4000-6000. AS WE TAXIED DOWN 14L WE WERE INSTRUCTED TO TURN R ON 27R AND HOLD SHORT OF THE 32 PARALLEL. RWY CONDITIONS WERE 14L COVERED WITH SNOW/SLUSH, IT HAD BEEN PLOWED 1 1/2 HRS PRIOR, BUT IT HAD BEEN SNOWING THE ENTIRE TIME. 27R WAS COVERED WITH SNOW AND HAD NOT BEEN PLOWED. DUE TO THE VISUAL REFS THAT I SAW I STARTED A TURN THINKING I WAS TURNING ONTO 27R. WHAT I ACTUALLY SAW WAS THE N SIDE RWY LIGHTS OF 27R AND THE 14L RWY LIGHTS ALIGNING WITH THE LIGHTS OF 27R. THE ERROR WAS REALIZED BUT NOT IN TIME TO STOP THE ACFT. THE NOSE WHEEL EXITED THE W SIDE OF 14L APPROX 1 FT. THE ACFT WAS SHUT DOWN AND ASSISTANCE CALLED. NO DAMAGED TO ACFT OR PERSONNEL. ONCE AGAIN DUE TO POOR AND NON STANDARD RWY/TAXIWAY MARKING WITH POOR VISIBILITY WE HAVE ANOTHER INCIDENT.

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.