A B757 crew declared an emergency; and diverted to a nearby airport after completing the smoke; fire...

Attributes
ACN	1107821
Time
Date	201308
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

At FL400 shortly after leveloff; we noted a haze in the cockpit which soon developed into light smoke emanating from behind the instrument panel. We quickly donned our oxygen masks; declared an emergency; and began an immediate descent into a divert airport. We performed the QRH 'smoke; fire; and fumes' and after step 10; 'eqpt cooling switch - altn' and step 15; 'rt pack - off;' we noticed that the light smoke abated leaving a residual haze in the cockpit. We flew an ILS approach to runway xx; landed; cleared the runway; had fire and rescue check the aircraft for any signs of fire; and then taxied to the ramp.maintenance was troubleshooting the aircraft after landing and was concentrating on an equipment cooling fan and an equipment cooling filter.

Original NASA ASRS Text

Title: A B757 crew declared an emergency; and diverted to a nearby airport after completing the Smoke; Fire or Fumes Checklist for an odor and white smoke in the cockpit.

Narrative: At FL400 shortly after leveloff; we noted a haze in the cockpit which soon developed into light smoke emanating from behind the instrument panel. We quickly donned our oxygen masks; declared an emergency; and began an immediate descent into a divert airport. We performed the QRH 'Smoke; Fire; and Fumes' and after step 10; 'EQPT Cooling Switch - ALTN' and step 15; 'Rt Pack - Off;' we noticed that the light smoke abated leaving a residual haze in the cockpit. We flew an ILS approach to Runway XX; landed; cleared the runway; had fire and rescue check the aircraft for any signs of fire; and then taxied to the ramp.Maintenance was troubleshooting the aircraft after landing and was concentrating on an equipment cooling fan and an equipment cooling filter.

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.

A B757 crew declared an emergency; and diverted to a nearby airport after completing the smoke; fire or fumes checklist for an odor and white smoke in the cockpit.