<< >> NASA ASRS Report 421541, November 1998

A B767 in cruise at FL410 declared an emergency and diverted due to detection of a burning odor caused by the failure of a recirculation fan bearing.

Attributes
ACN	421541
Time
Date	199811
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : als
State Reference	CO
Altitude	msl bound lower : 41000 msl bound upper : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Navigation In Use	Other
Flight Phase	cruise other other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 210 flight time total : 17000 flight time type : 5000
ASRS Report	421541
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 9750 flight time type : 850
ASRS Report	421362
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other

Narrative:

Approximately 70 NM west of alamosa, co, at FL410 detected burning odor. Followed all required checklists and procedures and, after consultation with company, elected to divert to den as nearest suitable airport due to operational familiarity, existing WX conditions, and excellent fire fighting/evacuate/evacuation handling capabilities. Dispatch coordinated emergency equipment. Uneventful landing at den. Maintenance subsequently discovered probable bearing failure in left recirculation fan motor.

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Original NASA ASRS Text

Title: A B767 IN CRUISE AT FL410 DECLARED AN EMER AND DIVERTED DUE TO DETECTION OF A BURNING ODOR CAUSED BY THE FAILURE OF A RECIRCULATION FAN BEARING.

Narrative: APPROX 70 NM W OF ALAMOSA, CO, AT FL410 DETECTED BURNING ODOR. FOLLOWED ALL REQUIRED CHKLISTS AND PROCS AND, AFTER CONSULTATION WITH COMPANY, ELECTED TO DIVERT TO DEN AS NEAREST SUITABLE ARPT DUE TO OPERATIONAL FAMILIARITY, EXISTING WX CONDITIONS, AND EXCELLENT FIRE FIGHTING/EVAC HANDLING CAPABILITIES. DISPATCH COORDINATED EMER EQUIP. UNEVENTFUL LNDG AT DEN. MAINT SUBSEQUENTLY DISCOVERED PROBABLE BEARING FAILURE IN L RECIRCULATION FAN MOTOR.

Data retrieved from NASA's ASRS site as of July 2007 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.