B757 Undifferentiated or Other Model
Flight Crew Last 90 Days 225; Flight Crew Total 16550; Flight Crew Type 5500
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Aircraft Equipment Problem Dissipated; Flight Crew Diverted; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
While in cruise at FL340 we felt a jolt and; at the same time; the autopilot disconnected; flight director disappeared and an EICAS message popped up (R REC FAN). I concentrated on re-connecting the autopilot (silencing the warning; re-engaging the flight director; and LNAV/ VNAV and autopilot). The First Class Flight Attendant called and advised of a strong burning odor (smoke) in first class and the loss of galley and entertainment system power. As soon as the Captain hung up the phone; we smelled the odor of some kind of fire. We immediately donned our mask and started planning for an emergency descent. Initially we headed for ZZZ but changed our mind to ZZZ2 since it was closer. Doing so did increase the work load for the Captain; [reducing the time available to] notify ATC; re-program the FMS and re-notify the company through ACARS. The Captain handled ATC; FMS and company communications. The Relief Pilot (who came back shortly time after we started our descent) handled the QRH and PA announcements. I concentrated on flying the airplane and staying close to ZZZ2. The fumes/smell did diminish and stopped during the descent and approach. We made an uneventful overweight landing and; after clearing the runway; assessed the situation. The Captain determined it was safe to taxi to the gate/hard stand.
Following a 'jolt' of the aircraft; temporary loss of some autoflight systems and an EICAS R REC FAN message the flight crew of a westbound transatlantic flight declared and emergency; initiated an emergency descent and diverted safely to a nearby airport.