Student pilot turns across takeoff path of B737 without clearance at class C airport.

Attributes
ACN	447761
Time
Date	199908
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sjc.airport
State Reference	CA
Altitude	msl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sjc.tower
Operator	general aviation : personal
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure : vfr
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tower : sjc.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Route In Use	departure sid : loupe
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : student
Experience	flight time last 90 days : 9 flight time total : 12 flight time type : 12
ASRS Report	447761
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Events
Anomaly	conflict : airborne critical non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 1000 vertical : 800
Supplementary
Problem Areas	Company Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Was climbing out of sjc off runway 29, headed for rhv. At about 1000 ft on upwind leg, asked controller if I could make right turn for rhv. Did not receive a reply but proceeded with the turn, and headed out for rhv. On return, while taxiing back to parking, ground asked me to call tower after parking. Tower then informed me that they had asked me to make a left downwind departure and that my right turn had taken me across the flight path of a B737 taking off from runway 30L. Due to relative inexperience, I misunderstood/did not properly hear this message. Will be more careful in future while communicating with ATC, especially while entering/departing airspace of busy airports.

Original NASA ASRS Text

Title: STUDENT PLT TURNS ACROSS TKOF PATH OF B737 WITHOUT CLRNC AT CLASS C ARPT.

Narrative: WAS CLBING OUT OF SJC OFF RWY 29, HEADED FOR RHV. AT ABOUT 1000 FT ON UPWIND LEG, ASKED CTLR IF I COULD MAKE R TURN FOR RHV. DID NOT RECEIVE A REPLY BUT PROCEEDED WITH THE TURN, AND HEADED OUT FOR RHV. ON RETURN, WHILE TAXIING BACK TO PARKING, GND ASKED ME TO CALL TWR AFTER PARKING. TWR THEN INFORMED ME THAT THEY HAD ASKED ME TO MAKE A L DOWNWIND DEP AND THAT MY R TURN HAD TAKEN ME ACROSS THE FLT PATH OF A B737 TAKING OFF FROM RWY 30L. DUE TO RELATIVE INEXPERIENCE, I MISUNDERSTOOD/DID NOT PROPERLY HEAR THIS MESSAGE. WILL BE MORE CAREFUL IN FUTURE WHILE COMMUNICATING WITH ATC, ESPECIALLY WHILE ENTERING/DEPARTING AIRSPACE OF BUSY ARPTS.

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.