Medium transport aircraft first officer reported a taxiway incursion at sjc airport. First officer s...

Narrative:

After landing at sjc (runway 30L); we were instructed to exit the runway left on taxiway J; and then to taxi; via V; to the [FBO] ramp. I was in the left seat; the PIC was in the right seat with the airport diagram up in front of him. It was dark; and I was taxiing the aircraft very slowly as I attempted to identify the correct taxiway. I saw 2 taxiways; the first (parallel and closest to the runway) was clearly marked 'west.' I looked -- but could not see any signage for the second/next taxiway (parallel to the runway and closest to the ramp). I asked the PIC if he thought that was; in fact; taxiway V. He looked at the chart and affirmed that he thought it was. With both of us in agreement that we had reached taxiway V; I turned left and began taxing to [FBO] (parallel to the [FBO] ramp). A couple minutes later; ground control informed us that we had turned on to the wrong taxiway (that we were on taxiway W1). We were then given an additional instruction -- to turn right to enter the [FBO] ramp. There was no traffic conflict or other issue. The signage in that area of sjc is not adequate -- especially at night; and the airport diagram is a bit confusing as taxiway V appears to be the taxiway on to which we turned. Suggest better (additional) signage on taxiway J --clearly delineating taxiways west; W1 and V (especially important for night operations).

Original NASA ASRS Text

Title: Medium Transport aircraft First Officer reported a taxiway incursion at SJC airport. First Officer stated Taxiway J signage for taxiways W1 and V are inadequate at night.

Narrative: After landing at SJC (Runway 30L); we were instructed to exit the runway left on Taxiway J; and then to taxi; via V; to the [FBO] ramp. I was in the left seat; the PIC was in the right seat with the airport diagram up in front of him. It was dark; and I was taxiing the aircraft very slowly as I attempted to identify the correct taxiway. I saw 2 taxiways; the first (parallel and closest to the runway) was clearly marked 'W.' I looked -- but could not see any signage for the second/next taxiway (parallel to the runway and closest to the ramp). I asked the PIC if he thought that was; in fact; Taxiway V. He looked at the chart and affirmed that he thought it was. With both of us in agreement that we had reached Taxiway V; I turned left and began taxing to [FBO] (parallel to the [FBO] ramp). A couple minutes later; Ground Control informed us that we had turned on to the wrong taxiway (that we were on Taxiway W1). We were then given an additional instruction -- to turn right to enter the [FBO] ramp. There was no traffic conflict or other issue. The signage in that area of SJC is not adequate -- especially at night; and the airport diagram is a bit confusing as Taxiway V appears to be the taxiway on to which we turned. Suggest better (additional) signage on Taxiway J --clearly delineating taxiways W; W1 and V (especially important for night operations).

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1689173
Time
Date	201910
Place
Locale Reference	SJC.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Ground Incursion Taxiway

Medium transport aircraft first officer reported a taxiway incursion at sjc airport. First officer stated taxiway J signage for taxiways W1 and V are inadequate at night.