Narrative:

At FL350 in full autoflight the autothrottle disconnected with autothrottle EICAS and red autothrottle warning light. Tried to regain autothrottle by pressing quick disconnect buttons; recycling autothrottle master switch; both flight directors off then on; recycling autopilot; and every combination thereof. Autothrottle not regained. Within 5 minutes got weak acrid ozone/electrical type fumes in cockpit. Pilot not flying; first officer put on O2 mask. Captain left off mask to try to identify smell. Odor dissipated for a few minutes; then returned at moderate strength. [We were] unable to determine source. An A320 qualified jumpseater checked circuit breakers as captain donned his O2 mask. Declared emergency with center and requested as soon as possible landing. Center said ZZZ was 30 miles away; but ZZZ2 was about 50 nm to our south; equidistant in point of time. So we told center we would go to ZZZ2 as we were not familiar with ZZZ and both pilots were very familiar and current with ZZZ2. In addition; ZZZ2 had much better company support. Captain gave control of aircraft to the first officer and proceeded to accomplish qrc portion of smoke checklist. [We] performed expeditious hand-flown descent to ZZZ2; which required a 360 degree descending turn as we were so close. Called for emergency vehicles to stand by; told passengers to remain seated. During descent; the captain and the jumpseater saw some faint smoke coming from instrument area; but first officer did not see it as attention was mostly outside the aircraft. Captain took back control of aircraft for landing. Cleared runway and parked at gate. No further issues.

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Original NASA ASRS Text

Title: A B767-300 diverted to a nearby airport when a failed autothrottle event was followed by electrical odors and some visible smoke.

Narrative: At FL350 in full autoflight the autothrottle disconnected with AUTOTHROTTLE EICAS and red autothrottle warning light. Tried to regain autothrottle by pressing quick disconnect buttons; recycling autothrottle master switch; both flight directors off then on; recycling autopilot; and every combination thereof. Autothrottle not regained. Within 5 minutes got weak acrid ozone/electrical type fumes in cockpit. Pilot not flying; First Officer put on O2 mask. Captain left off mask to try to identify smell. Odor dissipated for a few minutes; then returned at moderate strength. [We were] unable to determine source. An A320 qualified jumpseater checked circuit breakers as Captain donned his O2 mask. Declared emergency with Center and requested ASAP landing. Center said ZZZ was 30 miles away; but ZZZ2 was about 50 nm to our south; equidistant in point of time. So we told Center we would go to ZZZ2 as we were not familiar with ZZZ and both pilots were very familiar and current with ZZZ2. In addition; ZZZ2 had much better company support. Captain gave control of aircraft to the First Officer and proceeded to accomplish QRC portion of smoke checklist. [We] performed expeditious hand-flown descent to ZZZ2; which required a 360 degree descending turn as we were so close. Called for emergency vehicles to stand by; told passengers to remain seated. During descent; the Captain and the jumpseater saw some faint smoke coming from instrument area; but First Officer did not see it as attention was mostly outside the aircraft. Captain took back control of aircraft for landing. Cleared runway and parked at gate. No further issues.

Data retrieved from NASA's ASRS site as of April 2012 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.