Flight crew flies as filed which was different from as cleared.

Attributes
ACN	297670
Time
Date	199503
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sac airport : sjc
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Twin Otter DHC-6
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	departure sid : sid enroute airway : sck
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 100 flight time total : 6900 flight time type : 2500
ASRS Report	297670
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were on a routine IFR flight from san jose to lincoln, ca. I had filed the sunol 4 departure with sacramento transition. (The copilot was aware of this). The copilot received the clearance and we departed. There was no mention that we were not cleared as filed. About 5 mi north of sunol intersection stockton approach asked what our assigned route was. The copilot read back our normal clearance. As he was doing so I noticed that he had written down that after sunol we were to go to manteca and then sacramento. Since the controller gave us a vector and didn't seem too concerned I did not bother to explain what had happened. The copilot and I discussed what had happened and we share the responsibility for the error. In the future I will always ask what our clearance is.

Original NASA ASRS Text

Title: FLC FLIES AS FILED WHICH WAS DIFFERENT FROM AS CLRED.

Narrative: WE WERE ON A ROUTINE IFR FLT FROM SAN JOSE TO LINCOLN, CA. I HAD FILED THE SUNOL 4 DEP WITH SACRAMENTO TRANSITION. (THE COPLT WAS AWARE OF THIS). THE COPLT RECEIVED THE CLRNC AND WE DEPARTED. THERE WAS NO MENTION THAT WE WERE NOT CLRED AS FILED. ABOUT 5 MI N OF SUNOL INTXN STOCKTON APCH ASKED WHAT OUR ASSIGNED RTE WAS. THE COPLT READ BACK OUR NORMAL CLRNC. AS HE WAS DOING SO I NOTICED THAT HE HAD WRITTEN DOWN THAT AFTER SUNOL WE WERE TO GO TO MANTECA AND THEN SACRAMENTO. SINCE THE CTLR GAVE US A VECTOR AND DIDN'T SEEM TOO CONCERNED I DID NOT BOTHER TO EXPLAIN WHAT HAD HAPPENED. THE COPLT AND I DISCUSSED WHAT HAD HAPPENED AND WE SHARE THE RESPONSIBILITY FOR THE ERROR. IN THE FUTURE I WILL ALWAYS ASK WHAT OUR CLRNC IS.

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.