Cpr light transport lost 1500' in turbulence while flying at FL390 over mountainous terrain.

Attributes
ACN	168973
Time
Date	199101
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mva
State Reference	NV
Altitude	msl bound lower : 37500 msl bound upper : 39000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : zlc
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : cfi pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 125 flight time total : 8200
ASRS Report	168973
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

Encountered severe turbulence and lost approximately 1500' from cruise altitude FL390. Immediately notified ATC and requested FL370. We heard ATC instruct another aircraft to immediately descend to FL350, but ATC did not mention conflict danger to us.

Original NASA ASRS Text

Title: CPR LTT LOST 1500' IN TURBULENCE WHILE FLYING AT FL390 OVER MOUNTAINOUS TERRAIN.

Narrative: ENCOUNTERED SEVERE TURB AND LOST APPROX 1500' FROM CRUISE ALT FL390. IMMEDIATELY NOTIFIED ATC AND REQUESTED FL370. WE HEARD ATC INSTRUCT ANOTHER ACFT TO IMMEDIATELY DSND TO FL350, BUT ATC DID NOT MENTION CONFLICT DANGER TO US.

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.