Flight crew encounter severe turbulence near aircraft ceiling.

Attributes
ACN	311946
Time
Date	199507
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zme
State Reference	TN
Altitude	msl bound lower : 37000 msl bound upper : 42800
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 4000
ASRS Report	311946
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was climbing to avoid prospective WX and thunderstorms. No thunderstorms were indicated on my WX radar. Climbing out of FL428 we hit what I suspected was either a severe up or down draft. At this time I started an emergency descent turned 90 degrees to left to avoid the WX in front squawked 7700 and told the controller of our plans. We leveled off at 37000 ft in clear air and continued our flight. I didn't hear the controller turn any aircraft to maintain proper vertical and horizontal clearance so we proceeded on with no other problems.

Original NASA ASRS Text

Title: FLC ENCOUNTER SEVERE TURB NEAR ACFT CEILING.

Narrative: I WAS CLBING TO AVOID PROSPECTIVE WX AND TSTMS. NO TSTMS WERE INDICATED ON MY WX RADAR. CLBING OUT OF FL428 WE HIT WHAT I SUSPECTED WAS EITHER A SEVERE UP OR DOWN DRAFT. AT THIS TIME I STARTED AN EMER DSCNT TURNED 90 DEGS TO L TO AVOID THE WX IN FRONT SQUAWKED 7700 AND TOLD THE CTLR OF OUR PLANS. WE LEVELED OFF AT 37000 FT IN CLR AIR AND CONTINUED OUR FLT. I DIDN'T HEAR THE CTLR TURN ANY ACFT TO MAINTAIN PROPER VERT AND HORIZ CLRNC SO WE PROCEEDED ON WITH NO OTHER PROBS.

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.