An air carrier captain was cleared to las runway 25R via taxiway C but taxied onto taxiway Q from th...

Attributes
ACN	1020511
Time
Date	201207
Local Time Of Day	0001-0600
Place
Locale Reference	LAS.Airport
State Reference	NV
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 190 Flight Crew Total 20000 Flight Crew Type 9000
Events
Anomaly	Deviation - Procedural Clearance Ground Incursion Taxiway

Narrative:

Taxiing out for departure was cleared to taxi to 25R via C. While leaving the east side of the ramp area near taxiway C1 looked to my left and saw a taxiway with a black C sign next to it. We both thought it was taxiway C and made a left turn; after taxiing eastbound ground control informed us that we were on taxiway Q not C. They subsequently recleared us to taxiway C via taxiway right. Prior to the turn on to Q we both looked and after seeing the black C sign next to the taxiway we both concluded that we were turning on to taxiway C. Neither of us saw a black taxiway Q sign anywhere near this taxiway which turned out to be taxiway Q. No traffic conflicts occurred and the rest of the flight was uneventfully.

Original NASA ASRS Text

Title: An air carrier Captain was cleared to LAS Runway 25R via Taxiway C but taxied onto Taxiway Q from the East Ramp near Spot 1 because he was confused by a C painted on the taxiway which made it appear to him that Taxiway Q was Taxiway C.

Narrative: Taxiing out for departure was cleared to taxi to 25R via C. While leaving the east side of the ramp area near Taxiway C1 looked to my left and saw a taxiway with a black C sign next to it. We both thought it was Taxiway C and made a left turn; after taxiing eastbound Ground Control informed us that we were on Taxiway Q not C. They subsequently recleared us to Taxiway C via Taxiway R. Prior to the turn on to Q we both looked and after seeing the black C sign next to the taxiway we both concluded that we were turning on to Taxiway C. Neither of us saw a black Taxiway Q sign anywhere near this taxiway which turned out to be Taxiway Q. No traffic conflicts occurred and the rest of the flight was uneventfully.

Data retrieved from NASA's ASRS site as of July 2013 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.

An air carrier captain was cleared to las runway 25R via taxiway C but taxied onto taxiway Q from the east ramp near spot 1 because he was confused by a C painted on the taxiway which made it appear to him that taxiway Q was taxiway C.