Following a 'jolt' of the aircraft; temporary loss of some autoflight systems and an EICAS right rec...

Narrative:

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 (right 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 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	1109670
Time
Date	201308
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	FO
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Plan	IFR
Component
Aircraft Component	Recirculation Fan
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 225 Flight Crew Total 16550 Flight Crew Type 5500
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Following a 'jolt' of the aircraft; temporary loss of some autoflight systems and an EICAS right 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.