GA small aircraft made an unauthorized takeoff from runway 30R at sjc. Pilot was still on ATCT groun...

Attributes
ACN	128468
Time
Date	198911
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sjc
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : takeoff ground other : taxi
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 11 flight time total : 103
ASRS Report	128468
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Events
Anomaly	incursion : runway non adherence : far non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I received clearance on frequency 118.0 to takeoff on runway 30R VFR to 4000' with transponder setting. After receiving this information I was told to go to ground frequency 121.8. I did and told them I had clearance to takeoff on 30R with the above information. I was told to taxi to runway 30R and ready for takeoff. I taxied to taxi holding area and looked to see if any aircraft was in pattern and thinking I was on tower frequency proceeded to takeoff on 30R. After taking off I checked my radios and found I was on the wrong radio and hot tower frequency. I changed to the tower frequency and called in. They instructed me to land on 30R and call upon parking aircraft. I described the issue and told them I was not intending to break the rules, but thought I was doing everything right, until I found out about the radio being tuned to the wrong frequency. The problem of switching from 118.0 to 121.8 to 120.7 with a select system has its problems of knowing what radio you are talking on.

Original NASA ASRS Text

Title: GA SMA MADE AN UNAUTH TKOF FROM RWY 30R AT SJC. PLT WAS STILL ON ATCT GND CTL FREQ AND FAILED TO CALL ATC LCL CTL.

Narrative: I RECEIVED CLRNC ON FREQ 118.0 TO TKOF ON RWY 30R VFR TO 4000' WITH XPONDER SETTING. AFTER RECEIVING THIS INFO I WAS TOLD TO GO TO GND FREQ 121.8. I DID AND TOLD THEM I HAD CLRNC TO TKOF ON 30R WITH THE ABOVE INFO. I WAS TOLD TO TAXI TO RWY 30R AND READY FOR TKOF. I TAXIED TO TAXI HOLDING AREA AND LOOKED TO SEE IF ANY ACFT WAS IN PATTERN AND THINKING I WAS ON TWR FREQ PROCEEDED TO TKOF ON 30R. AFTER TAKING OFF I CHKED MY RADIOS AND FOUND I WAS ON THE WRONG RADIO AND HOT TWR FREQ. I CHANGED TO THE TWR FREQ AND CALLED IN. THEY INSTRUCTED ME TO LAND ON 30R AND CALL UPON PARKING ACFT. I DESCRIBED THE ISSUE AND TOLD THEM I WAS NOT INTENDING TO BREAK THE RULES, BUT THOUGHT I WAS DOING EVERYTHING RIGHT, UNTIL I FOUND OUT ABOUT THE RADIO BEING TUNED TO THE WRONG FREQ. THE PROB OF SWITCHING FROM 118.0 TO 121.8 TO 120.7 WITH A SELECT SYS HAS ITS PROBS OF KNOWING WHAT RADIO YOU ARE TALKING ON.

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.

GA small aircraft made an unauthorized takeoff from runway 30R at sjc. Pilot was still on ATCT ground control frequency and failed to call ATC local control.