B777 flight crew and flight attendants detect smoke five hours into a flight to asia. QRH procedures...

Narrative:

A little over 6 hours into flight a hot electrical smell suddenly occurred in the cabin (mainly forward cabin). The pilots on break; flight attendants; and passengers were aware of the problem. We received a call to the cockpit and told of the situation while the crew began investigating the source and shutting down electrical systems. In the cockpit we checked weather for alternates and started smoke and fumes checklist. The associated smoke and smell began to dissipate. Entire crew convened in the cockpit; checklists were completed. The company notified. Maintenance control; through onboard telemetry; notified us that a recirc fan was indicating a problem. The recirc fans were secured when we accomplished the smoke and fumes checklist. An uneventful precautionary landing was made. Approximately 65;000 pounds fuel dumped in order to land below 460;000 gross weight (we landed at 458;000 pounds). ATC was notified of start and stop dump times. An emergency was not officially declared however once we asked for altitude relief on the STAR in order to stay as high as possible during dumping ATC began to refer to us as an emergency aircraft and ask us for souls on board. Passengers remained on board after landing. Aircraft was redispatched on MEL for recirc fan and flight completed.

Original NASA ASRS Text

Title: B777 flight crew and flight attendants detect smoke five hours into a flight to Asia. QRH procedures are complied with; the likely source (a recirculation fan) is determined and the flight diverts to a suitable airport after dumping fuel down to maximum landing weight. The fan failure is confirmed and the flight continues to destination with the fan on MEL.

Narrative: A little over 6 hours into flight a hot electrical smell suddenly occurred in the cabin (mainly forward cabin). The pilots on break; flight attendants; and passengers were aware of the problem. We received a call to the cockpit and told of the situation while the crew began investigating the source and shutting down electrical systems. In the cockpit we checked weather for alternates and started Smoke and Fumes Checklist. The associated smoke and smell began to dissipate. Entire crew convened in the cockpit; checklists were completed. The company notified. Maintenance Control; through onboard telemetry; notified us that a recirc fan was indicating a problem. The recirc fans were secured when we accomplished the Smoke and Fumes Checklist. An uneventful precautionary landing was made. Approximately 65;000 LBS fuel dumped in order to land below 460;000 gross weight (we landed at 458;000 LBS). ATC was notified of start and stop dump times. An emergency was not officially declared however once we asked for altitude relief on the STAR in order to stay as high as possible during dumping ATC began to refer to us as an emergency aircraft and ask us for souls on board. Passengers remained on board after landing. Aircraft was redispatched on MEL for recirc fan and flight completed.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1151186
Time
Date	201402
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Recirculation Fan
Person 1
Function	Pilot Flying Relief Pilot First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Relief Pilot Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor