Narrative:

Black/gray smoke and acrid (electrical fumes) smoke from center of throttle quadrant coming from thrust lever tracks. Quadrant very hot. Donned oxygen masks, turned 'off' autothrottles. Prepared smoke goggles for use, but not required. Turned air system 'econ' switch off (maximum air flow for packs). Turned off cabin bus and checked electrical panel (smoke checklist), declared emergency with sfo radio, and turned off track 25 mi (descended 500 ft). Cleared direct shemya, eareckson, a.south. By zan. Use of manual throttles increased fumes, but no smoke. Landed in shemya, ak, with fire equipment escort. Firemen boarded aircraft and confirmed fumes. Aircraft secured in shemya. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was an MD11 and the thick gray/black acrid smoke came from the throttle quadrant and up to the level of the glare shield with heat radiating from the quadrant. The reporter said the autothrottles were switched off and the packs switched to high flow dispersing the smoke. The reporter stated that moving the throttles manually did not cause any smoke but increased the acrid fumes. The reporter was present when the autothrottle quadrant module was removed and disassembled by the manufacturer and the findings were a brake coil had shorted and burned. When asked by the analyst if any autothrottle and speed control circuit breakers tripped, the reporter answered none of the breakers associated with this system tripped. The reporter said only 1 breaker was found tripped and it was the landing gear position indicating system.

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Original NASA ASRS Text

Title: AN MD11 IN CRUISE AT FL330 DECLARED AN EMER AND DIVERTED DUE TO SMOKE AND HEAT IN THE COCKPIT CAUSED BY THE #1 AUTOTHROTTLE CLUTCH BRAKE COIL SHORTED AND BURNED.

Narrative: BLACK/GRAY SMOKE AND ACRID (ELECTRICAL FUMES) SMOKE FROM CTR OF THROTTLE QUADRANT COMING FROM THRUST LEVER TRACKS. QUADRANT VERY HOT. DONNED OXYGEN MASKS, TURNED 'OFF' AUTOTHROTTLES. PREPARED SMOKE GOGGLES FOR USE, BUT NOT REQUIRED. TURNED AIR SYS 'ECON' SWITCH OFF (MAX AIR FLOW FOR PACKS). TURNED OFF CABIN BUS AND CHKED ELECTRICAL PANEL (SMOKE CHKLIST), DECLARED EMER WITH SFO RADIO, AND TURNED OFF TRACK 25 MI (DSNDED 500 FT). CLRED DIRECT SHEMYA, EARECKSON, A.S. BY ZAN. USE OF MANUAL THROTTLES INCREASED FUMES, BUT NO SMOKE. LANDED IN SHEMYA, AK, WITH FIRE EQUIP ESCORT. FIREMEN BOARDED ACFT AND CONFIRMED FUMES. ACFT SECURED IN SHEMYA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS AN MD11 AND THE THICK GRAY/BLACK ACRID SMOKE CAME FROM THE THROTTLE QUADRANT AND UP TO THE LEVEL OF THE GLARE SHIELD WITH HEAT RADIATING FROM THE QUADRANT. THE RPTR SAID THE AUTOTHROTTLES WERE SWITCHED OFF AND THE PACKS SWITCHED TO HIGH FLOW DISPERSING THE SMOKE. THE RPTR STATED THAT MOVING THE THROTTLES MANUALLY DID NOT CAUSE ANY SMOKE BUT INCREASED THE ACRID FUMES. THE RPTR WAS PRESENT WHEN THE AUTOTHROTTLE QUADRANT MODULE WAS REMOVED AND DISASSEMBLED BY THE MANUFACTURER AND THE FINDINGS WERE A BRAKE COIL HAD SHORTED AND BURNED. WHEN ASKED BY THE ANALYST IF ANY AUTOTHROTTLE AND SPD CTL CIRCUIT BREAKERS TRIPPED, THE RPTR ANSWERED NONE OF THE BREAKERS ASSOCIATED WITH THIS SYS TRIPPED. THE RPTR SAID ONLY 1 BREAKER WAS FOUND TRIPPED AND IT WAS THE LNDG GEAR POS INDICATING SYS.

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.