Commuter light transport developed high cabin temperature and an electrical smell in the cabin. Flight crew isolated the problem to the left air cycle machine and following company procedure returned to departure airport.

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Attributes
ACN	148700
Time
Date	199006
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : msp
State Reference	MN
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute airway : zmp
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 225 flight time total : 2300 flight time type : 800
ASRS Report	148700
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other other : unspecified
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

F/a advised passenger cabin was extremely warm and there was smoke and an electrical smell in the cabin. The crew immediately complied with our emergency procedures and returned to msp west/O incident. After isolating the problem to the left air cycle machine we shut off the bleed air on the left side. The smoke and electrical smell stopped at this point. After landing we determined that an evacuation was not warranted due to no smoke in the cabin.

Original NASA ASRS Text

Title: COMMUTER LTT DEVELOPED HIGH CABIN TEMP AND AN ELECTRICAL SMELL IN THE CABIN. FLT CREW ISOLATED THE PROBLEM TO THE LEFT AIR CYCLE MACHINE AND FOLLOWING COMPANY PROC RETURNED TO DEP ARPT.

Narrative: F/A ADVISED PAX CABIN WAS EXTREMELY WARM AND THERE WAS SMOKE AND AN ELECTRICAL SMELL IN THE CABIN. THE CREW IMMEDIATELY COMPLIED WITH OUR EMER PROCS AND RETURNED TO MSP W/O INCIDENT. AFTER ISOLATING THE PROB TO THE L AIR CYCLE MACHINE WE SHUT OFF THE BLEED AIR ON THE L SIDE. THE SMOKE AND ELECTRICAL SMELL STOPPED AT THIS POINT. AFTER LNDG WE DETERMINED THAT AN EVACUATION WAS NOT WARRANTED DUE TO NO SMOKE IN THE CABIN.

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.