Aircraft rises 1200 ft as it enters convective lifting area.

Attributes
ACN	283644
Time
Date	199407
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : jax
State Reference	FL
Altitude	msl bound lower : 10000 msl bound upper : 11200
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx tower : psm
Operator	general aviation : personal
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	inflight encounter : weather other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

On jul/xx/94 coming from mlb to ahn I was around 10000 ft north of jax when I encountered convected activity which was an updraft at greater than 2000 FPM. I immediately notified center but for some reason center did not understand when I informed center about convected activity which had caused me to climb 1200 ft within about 20 seconds. I was flying a cessna on each of the occasions referred to above. In the altitude excursion I was in what was basically an emergency situation because of the convective and did my best to simply keep the wings level and control the airplane for the 20 seconds the altitude was increasing in turbulence and notified center immediately. It was simply impossible to maintain altitude in the face of an air mass which was rising in excess of 2000 FPM (my vertical speed indicator pegged at 2000 ft) and I did notify center immediately upon getting the airplane stabilized. In fact I notified center while we were still in the rising air mass. We were in IMC on an IFR flight plan. I hesitate to talk back to the controllers because when they admonish me I feel it would simply waste air time for me to be responding. I think that from now on I will respond.

Original NASA ASRS Text

Title: ACFT RISES 1200 FT AS IT ENTERS CONVECTIVE LIFTING AREA.

Narrative: ON JUL/XX/94 COMING FROM MLB TO AHN I WAS AROUND 10000 FT N OF JAX WHEN I ENCOUNTERED CONVECTED ACTIVITY WHICH WAS AN UPDRAFT AT GREATER THAN 2000 FPM. I IMMEDIATELY NOTIFIED CTR BUT FOR SOME REASON CTR DID NOT UNDERSTAND WHEN I INFORMED CTR ABOUT CONVECTED ACTIVITY WHICH HAD CAUSED ME TO CLB 1200 FT WITHIN ABOUT 20 SECONDS. I WAS FLYING A CESSNA ON EACH OF THE OCCASIONS REFERRED TO ABOVE. IN THE ALT EXCURSION I WAS IN WHAT WAS BASICALLY AN EMER SIT BECAUSE OF THE CONVECTIVE AND DID MY BEST TO SIMPLY KEEP THE WINGS LEVEL AND CTL THE AIRPLANE FOR THE 20 SECONDS THE ALT WAS INCREASING IN TURB AND NOTIFIED CTR IMMEDIATELY. IT WAS SIMPLY IMPOSSIBLE TO MAINTAIN ALT IN THE FACE OF AN AIR MASS WHICH WAS RISING IN EXCESS OF 2000 FPM (MY VERT SPD INDICATOR PEGGED AT 2000 FT) AND I DID NOTIFY CTR IMMEDIATELY UPON GETTING THE AIRPLANE STABILIZED. IN FACT I NOTIFIED CTR WHILE WE WERE STILL IN THE RISING AIR MASS. WE WERE IN IMC ON AN IFR FLT PLAN. I HESITATE TO TALK BACK TO THE CTLRS BECAUSE WHEN THEY ADMONISH ME I FEEL IT WOULD SIMPLY WASTE AIR TIME FOR ME TO BE RESPONDING. I THINK THAT FROM NOW ON I WILL RESPOND.

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.