Pilot of small aircraft twin penetrated turbulent WX.

Attributes
ACN	119646
Time
Date	198908
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ays
State Reference	GA
Altitude	msl bound lower : 8300 msl bound upper : 9700
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	cruise other
Route In Use	enroute airway : zjx
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 21 flight time total : 514 flight time type : 35
ASRS Report	119646
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other spatial deviation
Independent Detector	other controllera other other : unspecified cockpit
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I departed vrb at XX15 local obtaining AFSS WX brief. Upon reaching jax, clouds began increasing. I obtained a WX update from mcn AFSS while 10 mi northwest of jac and found a line of thunderstorms to be developing between ays and albany, GA. Flight conditions were mostly VFR on top. Upon entering clouds, the aircraft became difficult to control. Severe updrafts and downdrafts were encountered. I deviated from altitude by plus or minus 700'. The aircraft was put into several 60 degree banks, my main concern was flying the aircraft. I deviated from course probably 5-7 mi. I slowed the aircraft to maneuvering speed to facilitate better control of the aircraft. ZJX provided vectors north which kept me out of extreme WX. I encountered light to moderate rain and moderate to heavy turbulence in the clouds. In retrospect, I should have asked for en route WX prior to jax. I could have asked for an amended route by passing the WX area by a wide margin. Entire episode probably did not exceed 15-20 minutes.

Original NASA ASRS Text

Title: PLT OF SMA TWIN PENETRATED TURBULENT WX.

Narrative: I DEPARTED VRB AT XX15 LOCAL OBTAINING AFSS WX BRIEF. UPON REACHING JAX, CLOUDS BEGAN INCREASING. I OBTAINED A WX UPDATE FROM MCN AFSS WHILE 10 MI NW OF JAC AND FOUND A LINE OF TSTMS TO BE DEVELOPING BETWEEN AYS AND ALBANY, GA. FLT CONDITIONS WERE MOSTLY VFR ON TOP. UPON ENTERING CLOUDS, THE ACFT BECAME DIFFICULT TO CONTROL. SEVERE UPDRAFTS AND DOWNDRAFTS WERE ENCOUNTERED. I DEVIATED FROM ALT BY PLUS OR MINUS 700'. THE ACFT WAS PUT INTO SEVERAL 60 DEG BANKS, MY MAIN CONCERN WAS FLYING THE ACFT. I DEVIATED FROM COURSE PROBABLY 5-7 MI. I SLOWED THE ACFT TO MANEUVERING SPEED TO FACILITATE BETTER CONTROL OF THE ACFT. ZJX PROVIDED VECTORS NORTH WHICH KEPT ME OUT OF EXTREME WX. I ENCOUNTERED LIGHT TO MODERATE RAIN AND MODERATE TO HEAVY TURBULENCE IN THE CLOUDS. IN RETROSPECT, I SHOULD HAVE ASKED FOR ENRTE WX PRIOR TO JAX. I COULD HAVE ASKED FOR AN AMENDED ROUTE BY PASSING THE WX AREA BY A WIDE MARGIN. ENTIRE EPISODE PROBABLY DID NOT EXCEED 15-20 MINUTES.

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.