<< >> NASA ASRS Report 535155, January 2002

A B727 crew, in cruise at FL330, encountered severe clear air turbulence, causing altdevs of plus or minus 300 ft of assigned altitude.

Attributes
ACN	535155
Time
Date	200201
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : sjt.vortac
State Reference	AL
Altitude	msl single value : 33000
Environment
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu.artcc
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
ASRS Report	535155
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter other non adherence : published procedure non adherence : clearance non adherence : far other anomaly
Independent Detector	other flight crewa other flight crewb other flight crewb
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	Weather Flight Crew Human Performance
Primary Problem	Weather

Narrative:

Severe clear air turbulence was encountered en route. Altdevs +/-300 ft. Pilots notified ATC and descended immediately to smooth air (FL270).

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Original NASA ASRS Text

Title: A B727 CREW, IN CRUISE AT FL330, ENCOUNTERED SEVERE CLR AIR TURB, CAUSING ALTDEVS OF PLUS OR MINUS 300 FT OF ASSIGNED ALT.

Narrative: SEVERE CLR AIR TURB WAS ENCOUNTERED ENRTE. ALTDEVS +/-300 FT. PLTS NOTIFIED ATC AND DSNDED IMMEDIATELY TO SMOOTH AIR (FL270).

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.