An A300 crew reports an uncommanded right roll after takeoff possibly due to contaminated surfaces. ...

Attributes
ACN	813200
Time
Date	200811
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	agl single value : 3000
Environment
Flight Conditions	Mixed
Weather Elements	Fog Ice Snow
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure sid : zzzz
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 25000 flight time type : 5000
ASRS Report	813200
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 30 flight time total : 6500 flight time type : 400
ASRS Report	813201
Events
Anomaly	inflight encounter : weather other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : regained aircraft control
Supplementary
Problem Areas	Weather Environmental Factor Aircraft
Primary Problem	Aircraft

Narrative:

During preflight the captain requested a second de-icing due to the fact that the de-icing crew did not leave the type of fluid nor the holdover start time with the operating crew. Heavy snow and sleet developed after the first de-icing. Both the first officer and myself verified and confirmed the RNAV SID in the FMC during cockpit preflight duties. During departure from ZZZZ on the RNAV SID at approximately 3000 ft the autoplt suddenly turned the aircraft slightly to the right of course momentarily off the SID. The first officer was the PF. The first officer intervened by clicking off the autoplt and flew the aircraft back onto the SID. The aircraft had been parked in ZZZZ all weekend and sleet; ice and snow had developed on the surfaces. The sudden roll experienced was that similar to an approach roll oscillation when ice develops on the control surfaces during an approach. We asked ATC after the event had we deviated from course and he answered no. There were no further encounters with the autoplt for the rest of the flight.supplemental information from acn 813201: the flight control check responded as it should have and the airplane behaved normally on the takeoff roll and initial climb. At 1000 ft the autoplt was selected on in accordance with departure procedures. When the aircraft was approaching its first turn to the left; it departed the course and started an uncommanded right turn.callback conversation with reporter revealed the following information: the reporter stated that ice accumulation on flight control surfaces during approach is a known issue with this aircraft. His company has developed a procedure that tells the crew to disconnect the autoplt and hand fly the approach. In this event; the reporter is speculating that ice was the issue and so the approach procedures were applied. He doesn't know what caused the uncommanded roll but because it felt similar to the approach roll he is speculating that was caused by icing.

Original NASA ASRS Text

Title: AN A300 CREW RPTS AN UNCOMMANDED R ROLL AFTER TKOF POSSIBLY DUE TO CONTAMINATED SURFACES. THE ACFT HAD BEEN DE-ICED PRIOR TO TKOF BUT WAS PREVIOUSLY PARKED IN ICE AND SNOW AN ENTIRE WEEKEND.

Narrative: DURING PREFLT THE CAPT REQUESTED A SECOND DE-ICING DUE TO THE FACT THAT THE DE-ICING CREW DID NOT LEAVE THE TYPE OF FLUID NOR THE HOLDOVER START TIME WITH THE OPERATING CREW. HEAVY SNOW AND SLEET DEVELOPED AFTER THE FIRST DE-ICING. BOTH THE FO AND MYSELF VERIFIED AND CONFIRMED THE RNAV SID IN THE FMC DURING COCKPIT PREFLT DUTIES. DURING DEP FROM ZZZZ ON THE RNAV SID AT APPROX 3000 FT THE AUTOPLT SUDDENLY TURNED THE ACFT SLIGHTLY TO THE R OF COURSE MOMENTARILY OFF THE SID. THE FO WAS THE PF. THE FO INTERVENED BY CLICKING OFF THE AUTOPLT AND FLEW THE ACFT BACK ONTO THE SID. THE ACFT HAD BEEN PARKED IN ZZZZ ALL WEEKEND AND SLEET; ICE AND SNOW HAD DEVELOPED ON THE SURFACES. THE SUDDEN ROLL EXPERIENCED WAS THAT SIMILAR TO AN APCH ROLL OSCILLATION WHEN ICE DEVELOPS ON THE CTL SURFACES DURING AN APCH. WE ASKED ATC AFTER THE EVENT HAD WE DEVIATED FROM COURSE AND HE ANSWERED NO. THERE WERE NO FURTHER ENCOUNTERS WITH THE AUTOPLT FOR THE REST OF THE FLT.SUPPLEMENTAL INFO FROM ACN 813201: THE FLT CTL CHECK RESPONDED AS IT SHOULD HAVE AND THE AIRPLANE BEHAVED NORMALLY ON THE TAKEOFF ROLL AND INITIAL CLIMB. AT 1000 FT THE AUTOPLT WAS SELECTED ON IN ACCORDANCE WITH DEP PROCS. WHEN THE ACFT WAS APCHING ITS FIRST TURN TO THE L; IT DEPARTED THE COURSE AND STARTED AN UNCOMMANDED R TURN.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT ICE ACCUMULATION ON FLT CTL SURFACES DURING APCH IS A KNOWN ISSUE WITH THIS ACFT. HIS COMPANY HAS DEVELOPED A PROC THAT TELLS THE CREW TO DISCONNECT THE AUTOPLT AND HAND FLY THE APCH. IN THIS EVENT; THE RPTR IS SPECULATING THAT ICE WAS THE ISSUE AND SO THE APCH PROCEDURES WERE APPLIED. HE DOESN'T KNOW WHAT CAUSED THE UNCOMMANDED ROLL BUT BECAUSE IT FELT SIMILAR TO THE APCH ROLL HE IS SPECULATING THAT WAS CAUSED BY ICING.

Data retrieved from NASA's ASRS site as of May 2009 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.

An A300 crew reports an uncommanded right roll after takeoff possibly due to contaminated surfaces. The aircraft had been de-iced prior to takeoff but was previously parked in ice and snow an entire weekend.