A canadair regional jet in cruise at FL310 declared an emergency and diverted due to an intermittent cargo compartment smoke warning caused by an overheated cargo compartment vent fan.

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Attributes
ACN	397022
Time
Date	199803
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cvg
State Reference	OH
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid tower : cmh
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other 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 : 250 flight time total : 8000 flight time type : 1200
ASRS Report	397022
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Intermittent cargo smoke warning. Emergency procedure for cargo smoke and emergency evacuate/evacuation performed per QRH. Emergency declared with ZID. Good communication all around. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a canadair regional jet and the problem was an intermittent cargo compartment smoke warning. The reporter said the cause of the smoke warning was an overheated cargo compartment vent fan which did not trip the circuit breaker.

Original NASA ASRS Text

Title: A CANADAIR REGIONAL JET IN CRUISE AT FL310 DECLARED AN EMER AND DIVERTED DUE TO AN INTERMITTENT CARGO COMPARTMENT SMOKE WARNING CAUSED BY AN OVERHEATED CARGO COMPARTMENT VENT FAN.

Narrative: INTERMITTENT CARGO SMOKE WARNING. EMER PROC FOR CARGO SMOKE AND EMER EVAC PERFORMED PER QRH. EMER DECLARED WITH ZID. GOOD COM ALL AROUND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A CANADAIR REGIONAL JET AND THE PROB WAS AN INTERMITTENT CARGO COMPARTMENT SMOKE WARNING. THE RPTR SAID THE CAUSE OF THE SMOKE WARNING WAS AN OVERHEATED CARGO COMPARTMENT VENT FAN WHICH DID NOT TRIP THE CIRCUIT BREAKER.

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.