B767 crew was not able to engage any of the 3 autoplts.

Attributes
ACN	517805
Time
Date	200107
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : 01g.fss navaid : sac.vortac
State Reference	CA
Altitude	msl single value : 16000
Aircraft 1
Controlling Facilities	artcc : zoa.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	517805
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted other
Consequence	other other Other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Copilot hand flying trimmed aircraft attempted to engage center autoplt in command mode. Autoplt disconnect light and siren warning, aileron lockout EICAS and rudder ratio EICAS, and rudder trim went from 5 units right to zero units for trimmed flight. Copilot flew and talked with ATC while I ran the irregular procedures, talked with dispatch and maintenance, flight attendants and passenger. We tried to determine the extent of any problems talking with maintenance. We were not able to engage any autoplt or clear the EICAS cautions. An uneventful landing was made at ZZZ. Maintenance was able to fix the aileron and rudder ratio problems, but could not explain the abrupt change in rudder trim and the flight was canceled. Copilot stated he was engaging the autoplt and proceeded to push the center autoplt command switch. When he pushed the switch the autoplt disconnect warning and siren sounded, rudder ratio light and EICAS, and the aileron lockout light and EICAS. The aircraft at this point required approximately 30 degrees of left aileron to maintain straight flight. I advised ATC that we had a problem and would level at 17000 ft. He asked what the nature of the problem was and I stated I would get back to him in a short time.

Original NASA ASRS Text

Title: B767 CREW WAS NOT ABLE TO ENGAGE ANY OF THE 3 AUTOPLTS.

Narrative: COPLT HAND FLYING TRIMMED ACFT ATTEMPTED TO ENGAGE CTR AUTOPLT IN COMMAND MODE. AUTOPLT DISCONNECT LIGHT AND SIREN WARNING, AILERON LOCKOUT EICAS AND RUDDER RATIO EICAS, AND RUDDER TRIM WENT FROM 5 UNITS R TO ZERO UNITS FOR TRIMMED FLT. COPLT FLEW AND TALKED WITH ATC WHILE I RAN THE IRREGULAR PROCS, TALKED WITH DISPATCH AND MAINT, FLT ATTENDANTS AND PAX. WE TRIED TO DETERMINE THE EXTENT OF ANY PROBS TALKING WITH MAINT. WE WERE NOT ABLE TO ENGAGE ANY AUTOPLT OR CLR THE EICAS CAUTIONS. AN UNEVENTFUL LNDG WAS MADE AT ZZZ. MAINT WAS ABLE TO FIX THE AILERON AND RUDDER RATIO PROBS, BUT COULD NOT EXPLAIN THE ABRUPT CHANGE IN RUDDER TRIM AND THE FLT WAS CANCELED. COPLT STATED HE WAS ENGAGING THE AUTOPLT AND PROCEEDED TO PUSH THE CTR AUTOPLT COMMAND SWITCH. WHEN HE PUSHED THE SWITCH THE AUTOPLT DISCONNECT WARNING AND SIREN SOUNDED, RUDDER RATIO LIGHT AND EICAS, AND THE AILERON LOCKOUT LIGHT AND EICAS. THE ACFT AT THIS POINT REQUIRED APPROX 30 DEGS OF L AILERON TO MAINTAIN STRAIGHT FLT. I ADVISED ATC THAT WE HAD A PROB AND WOULD LEVEL AT 17000 FT. HE ASKED WHAT THE NATURE OF THE PROB WAS AND I STATED I WOULD GET BACK TO HIM IN A SHORT TIME.

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.