Private pilot of an small aircraft sel climbed above assigned altitude due to turbulence in cumulus clouds while the reporter was attempting to return to assigned altitude.

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Attributes
ACN	350430
Time
Date	199610
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ocn airport : san
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3400
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : san
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 9 flight time total : 550 flight time type : 320
ASRS Report	350430
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departure clearance assigned 3000 ft. At the time of the event I was in cumulus clouds in moderate to severe turbulence. I hit an updraft and was suddenly at 3400 ft. As I attempted to descend, controller asked me to say altitude. I said '3400 ft, attempting to descend to 3000 ft.' controller said 'you have busted your assigned altitude, climb and maintain 6000 ft.' I did as instructed. There was no conflict.

Original NASA ASRS Text

Title: PVT PLT OF AN SMA SEL CLBED ABOVE ASSIGNED ALT DUE TO TURB IN CUMULUS CLOUDS WHILE THE RPTR WAS ATTEMPTING TO RETURN TO ASSIGNED ALT.

Narrative: DEP CLRNC ASSIGNED 3000 FT. AT THE TIME OF THE EVENT I WAS IN CUMULUS CLOUDS IN MODERATE TO SEVERE TURB. I HIT AN UPDRAFT AND WAS SUDDENLY AT 3400 FT. AS I ATTEMPTED TO DSND, CTLR ASKED ME TO SAY ALT. I SAID '3400 FT, ATTEMPTING TO DSND TO 3000 FT.' CTLR SAID 'YOU HAVE BUSTED YOUR ASSIGNED ALT, CLB AND MAINTAIN 6000 FT.' I DID AS INSTRUCTED. THERE WAS NO CONFLICT.

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.