Heavy transport experiences failure of primary and backup instrument cooling fans.

Attributes
ACN	130343
Time
Date	198912
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : crl
State Reference	MI
Altitude	msl bound lower : 41000 msl bound upper : 41000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Heavy Transport
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 17500 flight time type : 2150
ASRS Report	130343
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Smoke in cockpit, used irregular procedures, smoke procedure. Both forward equipment cooling fans burned up, and circuit breaker popped. Obviously, the backup cooling fan did not function as advertised. Our maintenance technicians are researching this problem.

Original NASA ASRS Text

Title: HVT EXPERIENCES FAILURE OF PRIMARY AND BACKUP INSTRUMENT COOLING FANS.

Narrative: SMOKE IN COCKPIT, USED IRREGULAR PROCS, SMOKE PROC. BOTH FORWARD EQUIPMENT COOLING FANS BURNED UP, AND CIRCUIT BREAKER POPPED. OBVIOUSLY, THE BACKUP COOLING FAN DID NOT FUNCTION AS ADVERTISED. OUR MAINT TECHNICIANS ARE RESEARCHING THIS PROBLEM.

Data retrieved from NASA's ASRS site as of August 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.