Aircraft encountered pronounced turbulence followed by wave action, at FL370.

Attributes
ACN	294648
Time
Date	199501
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ywk
State Reference	NB
Altitude	msl bound lower : 36000 msl bound upper : 37000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : czqm
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 80 flight time total : 14000 flight time type : 1800
ASRS Report	294648
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	inflight encounter : weather inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During cruise at FL370 with autoplt engaged in altitude hold, navigation and thrust management engaged we were in an area of light chop when a wave type action occurred. After climbing and descending about 200 ft several times the aircraft lost 1000 ft within a period of about 10 seconds. The turbulence mode of the autoplt was engaged and the aircraft was immediately manually flown back to FL370 without incident. No other aircraft were in our area at the time.

Original NASA ASRS Text

Title: ACFT ENCOUNTERED PRONOUNCED TURB FOLLOWED BY WAVE ACTION, AT FL370.

Narrative: DURING CRUISE AT FL370 WITH AUTOPLT ENGAGED IN ALT HOLD, NAV AND THRUST MGMNT ENGAGED WE WERE IN AN AREA OF LIGHT CHOP WHEN A WAVE TYPE ACTION OCCURRED. AFTER CLBING AND DSNDING ABOUT 200 FT SEVERAL TIMES THE ACFT LOST 1000 FT WITHIN A PERIOD OF ABOUT 10 SECONDS. THE TURB MODE OF THE AUTOPLT WAS ENGAGED AND THE ACFT WAS IMMEDIATELY MANUALLY FLOWN BACK TO FL370 WITHOUT INCIDENT. NO OTHER ACFT WERE IN OUR AREA AT THE TIME.

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.