Flight crew of small transport taxied onto closed taxiway.

Attributes
ACN	111774
Time
Date	198905
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : spi
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 260 flight time total : 3100 flight time type : 1100
ASRS Report	111774
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Experience	flight time last 90 days : 250 flight time total : 1900 flight time type : 600
ASRS Report	112137
Events
Anomaly	non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Airport	other physical facility

Narrative:

Inadvertently taxied onto closed taxiway due to confusion on airport diagram on chart. It appeared the taxiway in question was the one we were to taxi on. We thought the taxiway was the one issued in the controller's instructions as depicted on the airport diagram chart. The txwys on the airport are not visually marked/identified or numbered. Callback conversation with reporter revealed the following: we were busy as we were taxiing and inadvertently passed up the taxiway where we were supposed to turn toward the runway. If there was a sign there designating the taxiway, we did not see it. I do not know why taxiway a is closed from that point to the end of runway 22 unless it is because of the national guard activity on and along that taxiway.

Original NASA ASRS Text

Title: FLT CREW OF SMT TAXIED ONTO CLOSED TXWY.

Narrative: INADVERTENTLY TAXIED ONTO CLOSED TXWY DUE TO CONFUSION ON ARPT DIAGRAM ON CHART. IT APPEARED THE TXWY IN QUESTION WAS THE ONE WE WERE TO TAXI ON. WE THOUGHT THE TXWY WAS THE ONE ISSUED IN THE CTLR'S INSTRUCTIONS AS DEPICTED ON THE ARPT DIAGRAM CHART. THE TXWYS ON THE ARPT ARE NOT VISUALLY MARKED/IDENTIFIED OR NUMBERED. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: WE WERE BUSY AS WE WERE TAXIING AND INADVERTENTLY PASSED UP THE TXWY WHERE WE WERE SUPPOSED TO TURN TOWARD THE RWY. IF THERE WAS A SIGN THERE DESIGNATING THE TXWY, WE DID NOT SEE IT. I DO NOT KNOW WHY TXWY A IS CLOSED FROM THAT POINT TO THE END OF RWY 22 UNLESS IT IS BECAUSE OF THE NATIONAL GUARD ACTIVITY ON AND ALONG THAT TXWY.

Data retrieved from NASA's ASRS site as of August 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.