A320 aircraft in cruise encountered mountain wave action. Aircraft accelerated to mach maximum operating and, due to protection modes in the aircraft, it pitched up and climbed 1400 ft before the reporter was able to disconnect the autoplt and descend back to assigned.

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Attributes
ACN	353428
Time
Date	199611
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lar
State Reference	WY
Altitude	msl bound lower : 37000 msl bound upper : 38300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 230 flight time total : 17000 flight time type : 3600
ASRS Report	353428
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather
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	other

Narrative:

Severe mountain wave. Aircraft accelerated to mach maximum operating in just a few seconds and started to climb at up to 1500 FPM. Aircraft is an A320 and was coupled up to autoplt 2 and autothrust. Had to disconnect autoplt to get control and descended back to cruise FL370. Maximum altitude reached was FL383.

Original NASA ASRS Text

Title: A320 ACFT IN CRUISE ENCOUNTERED MOUNTAIN WAVE ACTION. ACFT ACCELERATED TO MACH MAX OPERATING AND, DUE TO PROTECTION MODES IN THE ACFT, IT PITCHED UP AND CLBED 1400 FT BEFORE THE RPTR WAS ABLE TO DISCONNECT THE AUTOPLT AND DSND BACK TO ASSIGNED.

Narrative: SEVERE MOUNTAIN WAVE. ACFT ACCELERATED TO MACH MAX OPERATING IN JUST A FEW SECONDS AND STARTED TO CLB AT UP TO 1500 FPM. ACFT IS AN A320 AND WAS COUPLED UP TO AUTOPLT 2 AND AUTOTHRUST. HAD TO DISCONNECT AUTOPLT TO GET CTL AND DSNDED BACK TO CRUISE FL370. MAX ALT REACHED WAS FL383.

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.