Temporary loss of aircraft control in a night operation.

Attributes
ACN	268608
Time
Date	199404
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : irw
State Reference	OK
Altitude	msl bound lower : 28000 msl bound upper : 28000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 120 flight time total : 14000 flight time type : 600
ASRS Report	268608
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 11500 flight time type : 1000
ASRS Report	268492
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance other anomaly
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

On the apr/xx/94 at approximately XA05Z at FL280 and 90 mi east of will rogers VOR we had requested to deviate south of a line of thunderstorms and was given a center issued heading of 260 degrees. Our WX radar clearly indicated we would pass well to the south of the line and was painting no WX along our flight path. Suddenly and without warning we encountered severe turbulence and heavy rain. The aircraft pitched up violently and was climbing at a high rate. At 28300 ft the first officer disconnected the autoplt as it was his leg and attempted to maintain wings level and 0 degree pitch. I reduced the throttles to approximately 1.2 eprs to control aircraft speed. Even with all these actions taken, the aircraft was climbing unctlably. At approximately 28900 ft we flew out of this turbulence and rain and was able to regain control of the aircraft and returned to FL280. We estimate this encounter lasted no more than 10 seconds. Center called and questioned our altitude deviation and we advised them of our situation. We encountered no WX after this incident and the remainder of the flight was uneventful.

Original NASA ASRS Text

Title: TEMPORARY LOSS OF ACFT CTL IN A NIGHT OP.

Narrative: ON THE APR/XX/94 AT APPROX XA05Z AT FL280 AND 90 MI E OF WILL ROGERS VOR WE HAD REQUESTED TO DEVIATE S OF A LINE OF TSTMS AND WAS GIVEN A CTR ISSUED HDG OF 260 DEGS. OUR WX RADAR CLRLY INDICATED WE WOULD PASS WELL TO THE S OF THE LINE AND WAS PAINTING NO WX ALONG OUR FLT PATH. SUDDENLY AND WITHOUT WARNING WE ENCOUNTERED SEVERE TURB AND HVY RAIN. THE ACFT PITCHED UP VIOLENTLY AND WAS CLBING AT A HIGH RATE. AT 28300 FT THE FO DISCONNECTED THE AUTOPLT AS IT WAS HIS LEG AND ATTEMPTED TO MAINTAIN WINGS LEVEL AND 0 DEG PITCH. I REDUCED THE THROTTLES TO APPROX 1.2 EPRS TO CTL ACFT SPD. EVEN WITH ALL THESE ACTIONS TAKEN, THE ACFT WAS CLBING UNCTLABLY. AT APPROX 28900 FT WE FLEW OUT OF THIS TURB AND RAIN AND WAS ABLE TO REGAIN CTL OF THE ACFT AND RETURNED TO FL280. WE ESTIMATE THIS ENCOUNTER LASTED NO MORE THAN 10 SECONDS. CTR CALLED AND QUESTIONED OUR ALTDEV AND WE ADVISED THEM OF OUR SIT. WE ENCOUNTERED NO WX AFTER THIS INCIDENT AND THE REMAINDER OF THE FLT WAS UNEVENTFUL.

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.