An air carrier light transport failed to monitor several changes in airways clearance while taxiing and consequently failed to follow the last one given. Track deviation.

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Attributes
ACN	339325
Time
Date	199606
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iso
State Reference	NC
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : gsb tower : iso
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	climbout : initial 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 : 280 flight time total : 7000 flight time type : 350
ASRS Report	339325
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Our flight was cleared for takeoff at iso with an amended altitude of 10000 ft vice 3000 ft. Our on course clearance was unchanged from our pre-taxi clearance. While starting our left turn on course, my copilot and I discussed whether we were cleared on course or cleared to maintain runway heading. We both agreed on a left turn on course. Iso tower handed us off to gsb departure control. Climbing out of 1700 ft MSL, we contacted gsb and were told to maintain 2000 ft for conflicting traffic at 3000 ft. Gsb asked if we were cleared on course by iso tower. We responded that we had, which was refuted by iso tower in a follow-up call by gsb. My copilot and I were now unsure of our departure clearance issued by iso tower. Our flight continued to clt without further incident. In retrospect, we should have confirmed our clearance with iso tower. The major factor in this uncertainty was having clrncs issued gratuitously while running consecutive checklists during our short taxi. The actual clearance given to us is still unknown to my copilot or me.

Original NASA ASRS Text

Title: AN ACR LTT FAILED TO MONITOR SEVERAL CHANGES IN AIRWAYS CLRNC WHILE TAXIING AND CONSEQUENTLY FAILED TO FOLLOW THE LAST ONE GIVEN. TRACK DEV.

Narrative: OUR FLT WAS CLRED FOR TKOF AT ISO WITH AN AMENDED ALT OF 10000 FT VICE 3000 FT. OUR ON COURSE CLRNC WAS UNCHANGED FROM OUR PRE-TAXI CLRNC. WHILE STARTING OUR L TURN ON COURSE, MY COPLT AND I DISCUSSED WHETHER WE WERE CLRED ON COURSE OR CLRED TO MAINTAIN RWY HDG. WE BOTH AGREED ON A L TURN ON COURSE. ISO TWR HANDED US OFF TO GSB DEP CTL. CLBING OUT OF 1700 FT MSL, WE CONTACTED GSB AND WERE TOLD TO MAINTAIN 2000 FT FOR CONFLICTING TFC AT 3000 FT. GSB ASKED IF WE WERE CLRED ON COURSE BY ISO TWR. WE RESPONDED THAT WE HAD, WHICH WAS REFUTED BY ISO TWR IN A FOLLOW-UP CALL BY GSB. MY COPLT AND I WERE NOW UNSURE OF OUR DEP CLRNC ISSUED BY ISO TWR. OUR FLT CONTINUED TO CLT WITHOUT FURTHER INCIDENT. IN RETROSPECT, WE SHOULD HAVE CONFIRMED OUR CLRNC WITH ISO TWR. THE MAJOR FACTOR IN THIS UNCERTAINTY WAS HAVING CLRNCS ISSUED GRATUITOUSLY WHILE RUNNING CONSECUTIVE CHKLISTS DURING OUR SHORT TAXI. THE ACTUAL CLRNC GIVEN TO US IS STILL UNKNOWN TO MY COPLT OR 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.