Possible loss of aircraft control on departure.

Attributes
ACN	140495
Time
Date	199003
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cos
State Reference	CO
Altitude	msl bound lower : 7300 msl bound upper : 8300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cos
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 5500 flight time type : 2800
ASRS Report	140495
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 16750 flight time type : 1020
ASRS Report	140494
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : regained aircraft control flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

During departure from cos, climbing through 8300' MSL and in a left 15 degree bank, as the slats were retracted the aircraft made an uncontrolled roll further to approximately 60 degree bank. The captain, who was flying, disconnected the autoplt and proceeded to recover the aircraft. The slats were re-extended to aid the recovery. Approximately 1000' of altitude loss was experienced. Once established on a normal climb out, slats were retracted and all systems functioned normally. The flight continued to destination west/O incident. Callback conversation with reporter revealed the following: reporter states that the incident is still under investigation. The aircraft had been deiced prior to departure, although reporter states that ice was not visibly present at time of incident. Aircraft was on autoplt and VNAV was engaged.

Original NASA ASRS Text

Title: POSSIBLE LOSS OF ACFT CONTROL ON DEP.

Narrative: DURING DEP FROM COS, CLBING THROUGH 8300' MSL AND IN A LEFT 15 DEG BANK, AS THE SLATS WERE RETRACTED THE ACFT MADE AN UNCONTROLLED ROLL FURTHER TO APPROX 60 DEG BANK. THE CAPT, WHO WAS FLYING, DISCONNECTED THE AUTOPLT AND PROCEEDED TO RECOVER THE ACFT. THE SLATS WERE RE-EXTENDED TO AID THE RECOVERY. APPROX 1000' OF ALT LOSS WAS EXPERIENCED. ONCE ESTABLISHED ON A NORMAL CLBOUT, SLATS WERE RETRACTED AND ALL SYSTEMS FUNCTIONED NORMALLY. THE FLT CONTINUED TO DEST W/O INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR STATES THAT THE INCIDENT IS STILL UNDER INVESTIGATION. THE ACFT HAD BEEN DEICED PRIOR TO DEP, ALTHOUGH RPTR STATES THAT ICE WAS NOT VISIBLY PRESENT AT TIME OF INCIDENT. ACFT WAS ON AUTOPLT AND VNAV WAS ENGAGED.

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.