A B727 flight crew experiences an altitude deviation due to in-flight turbulence and updrafts in the proximity of thunderstorm activity west of jan, ms.

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Attributes
ACN	509099
Time
Date	200104
Day	Mon
Place
Locale Reference	airport : zfw.airport
State Reference	TX
Altitude	msl bound lower : 33000 msl bound upper : 33320
Environment
Flight Conditions	IMC
Weather Elements	Turbulence
Aircraft 1
Controlling Facilities	artcc : zfw.artcc tracon : pct.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	509099
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather non adherence : company policies non adherence : clearance non adherence : published procedure non adherence : far other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : returned to assigned altitude flight crew : exited adverse environment
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Weather

Narrative:

ZFW. Location: west of jackson, ms. En route, in a B727 at FL330 from dfw to mco at .77 mach, the captain (PF) deviated due to WX then corrected back on course as per instructions from center. IMC, static air temperature -50 degrees C, engine anti-ice on, wing anti-ice off. No WX return on radar in our flight path with correct tile. We encountered very strong updraft, moderate turbulence and moderate mixed ice. Aircraft ballooned to 320 ft in about 1 second. I instructed flight engineer to turn engine start switches to flight and wing anti-ice on while correcting to FL330. I had first officer (PNF) notify ATC of ballooning and WX conditions and that we were correcting. No traffic in area and no TCASII sightings or advisories. ATC just said roger and thanks for the WX advisories and clarification on type of icing. Incident lasted about 15-20 seconds. No problems with flight attendants or passenger.

Original NASA ASRS Text

Title: A B727 FLC EXPERIENCES AN ALTDEV DUE TO INFLT TURB AND UPDRAFTS IN THE PROX OF TSTM ACTIVITY W OF JAN, MS.

Narrative: ZFW. LOCATION: W OF JACKSON, MS. ENRTE, IN A B727 AT FL330 FROM DFW TO MCO AT .77 MACH, THE CAPT (PF) DEVIATED DUE TO WX THEN CORRECTED BACK ON COURSE AS PER INSTRUCTIONS FROM CTR. IMC, STATIC AIR TEMP -50 DEGS C, ENG ANTI-ICE ON, WING ANTI-ICE OFF. NO WX RETURN ON RADAR IN OUR FLT PATH WITH CORRECT TILE. WE ENCOUNTERED VERY STRONG UPDRAFT, MODERATE TURB AND MODERATE MIXED ICE. ACFT BALLOONED TO 320 FT IN ABOUT 1 SECOND. I INSTRUCTED FE TO TURN ENG START SWITCHES TO FLT AND WING ANTI-ICE ON WHILE CORRECTING TO FL330. I HAD FO (PNF) NOTIFY ATC OF BALLOONING AND WX CONDITIONS AND THAT WE WERE CORRECTING. NO TFC IN AREA AND NO TCASII SIGHTINGS OR ADVISORIES. ATC JUST SAID ROGER AND THANKS FOR THE WX ADVISORIES AND CLARIFICATION ON TYPE OF ICING. INCIDENT LASTED ABOUT 15-20 SECONDS. NO PROBS WITH FLT ATTENDANTS OR PAX.

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.