Turbulence creates a temporary loss of aircraft control in a commuter aircraft during a night operation. Altitude deviation altitude excursion occurs.

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Attributes
ACN	353140
Time
Date	199611
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ykm
State Reference	WA
Altitude	msl bound lower : 15000 msl bound upper : 15600
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zse
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : v448
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 240 flight time total : 3800 flight time type : 2100
ASRS Report	353140
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 other non adherence : clearance other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation other

Narrative:

During cruise, en route to yakima airfield, encountered moderate to severe turbulence at 15000 ft MSL. Significant updraft and upset caused altitude to temporarily increase to 15600 ft MSL. Controled the aircraft by immediately reducing power, slowing to maneuvering speed, and returning to assigned altitude. No aircraft or passenger damage. We had just passed downwind of mt adams and strong winds at altitude caused extremely rough disturbance in this area. This mountain lies directly below the airway (victor 448). With strong winds at altitude, next time will ask for deviation around this area. What a ride!

Original NASA ASRS Text

Title: TURB CREATES A TEMPORARY LOSS OF ACFT CTL IN A COMMUTER ACFT DURING A NIGHT OP. ALTDEV ALT EXCURSION OCCURS.

Narrative: DURING CRUISE, ENRTE TO YAKIMA AIRFIELD, ENCOUNTERED MODERATE TO SEVERE TURB AT 15000 FT MSL. SIGNIFICANT UPDRAFT AND UPSET CAUSED ALT TO TEMPORARILY INCREASE TO 15600 FT MSL. CTLED THE ACFT BY IMMEDIATELY REDUCING PWR, SLOWING TO MANEUVERING SPD, AND RETURNING TO ASSIGNED ALT. NO ACFT OR PAX DAMAGE. WE HAD JUST PASSED DOWNWIND OF MT ADAMS AND STRONG WINDS AT ALT CAUSED EXTREMELY ROUGH DISTURBANCE IN THIS AREA. THIS MOUNTAIN LIES DIRECTLY BELOW THE AIRWAY (VICTOR 448). WITH STRONG WINDS AT ALT, NEXT TIME WILL ASK FOR DEV AROUND THIS AREA. WHAT A RIDE!

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.