Narrative:

While at cruise first officer and I noticed a burning electrical odor in the cockpit. We followed the checklist in the QRH and contacted dispatch and maintenance. The fumes did dissipate; however; as we did not know the source; in the interest of a safety we diverted as a precaution. I made a normal overweight landing; and entered event in logbook.; after being awakened from first break; walked into cockpit and immediately smelled faint odor of burnt/overheating electrical equipment. No visible smoke. Captain had recently completed the smoke; fire or fumes QRH procedure and informed me we were diverting. First officer was flying the aircraft and was coordinating for direct to ZZZZ as directed by the captain. I got my ZZZZ airport chart out to help prepare for the approach and landing. Captain resumed aircraft control and flew approach to an uneventful overweight landing. On ground maintenance found that the forward equipment exhaust fan had failed. The flight attendants performed their duties flawlessly and professionally. They were also extremely attentive to the needs of the passengers in the terminal during the extended time we spent on the ground.; during cruise at FL310; detected fumes in the cockpit. The captain coordinated with the cabin. Determined fumes were confined to the cockpit only. Smelled electrical in nature. Ran QRH procedure. Contacted dispatch and maintenance control. Fumes then dissipated. Executed a precautionary diversion. Coordinated with dispatch; who alerted ground personnel. Uneventful overweight landing.

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Original NASA ASRS Text

Title: B767 flight crew experienced electrical fumes in the cockpit at FL310. QRH procedures were complied with and fumes dissipated but crew elected to make a precautionary diversion.

Narrative: While at cruise First Officer and I noticed a burning electrical odor in the cockpit. We followed the checklist in the QRH and contacted dispatch and maintenance. The fumes did dissipate; however; as we did not know the source; in the interest of a safety we diverted as a precaution. I made a normal overweight landing; and entered event in logbook.; After being awakened from first break; walked into cockpit and immediately smelled faint odor of burnt/overheating electrical equipment. No visible smoke. Captain had recently completed the Smoke; Fire or Fumes QRH procedure and informed me we were diverting. First Officer was flying the aircraft and was coordinating for direct to ZZZZ as directed by the Captain. I got my ZZZZ airport chart out to help prepare for the approach and landing. Captain resumed aircraft control and flew approach to an uneventful overweight landing. On ground maintenance found that the forward equipment exhaust fan had failed. The flight attendants performed their duties flawlessly and professionally. They were also extremely attentive to the needs of the passengers in the terminal during the extended time we spent on the ground.; During cruise at FL310; detected fumes in the cockpit. The Captain coordinated with the cabin. Determined fumes were confined to the cockpit only. Smelled electrical in nature. Ran QRH procedure. Contacted Dispatch and Maintenance control. Fumes then dissipated. Executed a precautionary diversion. Coordinated with Dispatch; who alerted ground personnel. Uneventful overweight landing.

Data retrieved from NASA's ASRS site as of July 2010 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.