An instructor and student pilot taxied without clearance at sus.

Attributes
ACN	438520
Time
Date	199905
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sus.airport
State Reference	MO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : sus.tower
Operator	general aviation : personal
Make Model Name	Bonanza 33
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	ground : taxi
Person 1
Affiliation	other
Function	instruction : trainee
Qualification	pilot : private
Experience	flight time last 90 days : 410 flight time total : 900 flight time type : 56
ASRS Report	438520
Person 2
Affiliation	other
Function	instruction : instructor
Qualification	pilot : commercial pilot : cfi
Events
Anomaly	incursion : taxiway non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Upon call to ground control for taxi clearance for VFR departure from the west t-hangars, I received a low volume (immediately increased) response granting taxi clearance to runway 26L. I acknowledged the clearance with a readback, and commenced to taxi to runway 26L. Once on taxiway a, I received a call from spirit ground inquiring of my intentions. I responded that I was taxiing to runway 26L as cleared. Spirit ground then advised that he had not communicated with me today. I stopped the aircraft immediately. Spirit ground then cleared me to taxi to runway 26L, and advised that he had been communicating with and clearing for a taxi, a bonanza. There was no bonanza visible on the taxiway. I continued with normal taxi and takeoff clearance, and departure. My instructor was in the aircraft with me.

Original NASA ASRS Text

Title: AN INSTRUCTOR AND STUDENT PLT TAXIED WITHOUT CLRNC AT SUS.

Narrative: UPON CALL TO GND CTL FOR TAXI CLRNC FOR VFR DEP FROM THE W T-HANGARS, I RECEIVED A LOW VOLUME (IMMEDIATELY INCREASED) RESPONSE GRANTING TAXI CLRNC TO RWY 26L. I ACKNOWLEDGED THE CLRNC WITH A READBACK, AND COMMENCED TO TAXI TO RWY 26L. ONCE ON TXWY A, I RECEIVED A CALL FROM SPIRIT GND INQUIRING OF MY INTENTIONS. I RESPONDED THAT I WAS TAXIING TO RWY 26L AS CLRED. SPIRIT GND THEN ADVISED THAT HE HAD NOT COMMUNICATED WITH ME TODAY. I STOPPED THE ACFT IMMEDIATELY. SPIRIT GND THEN CLRED ME TO TAXI TO RWY 26L, AND ADVISED THAT HE HAD BEEN COMMUNICATING WITH AND CLRING FOR A TAXI, A BONANZA. THERE WAS NO BONANZA VISIBLE ON THE TXWY. I CONTINUED WITH NORMAL TAXI AND TKOF CLRNC, AND DEP. MY INSTRUCTOR WAS IN THE ACFT WITH ME.

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.