An ATR42 on approach at 6000 ft declared an emergency due to #1 engine failure and aggravated by the failure of the propeller to feather. The engine was replaced.

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Attributes
ACN	439168
Time
Date	199905
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl single value : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	ATR 42
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : multi engine pilot : commercial pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 9100 flight time type : 3275
ASRS Report	439168
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : master warning other flight crewa other flight crewb
Resolutory Action	flight crew : landed in emergency condition flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

About 6 mins out of ord, we experienced a master warning, master caution on the central alert panel with a loss of engine performance. I complied with our QRH and shut the engine down. However, the propeller on the failing #1 engine would not 'feather.' after advising ATC to roll the crash fire rescue equipment, telling the flight attendant to prepare the cabin for a single engine landing, and calling company, I completed the approach checklist and, just inside the OM for runway 27L, I took control of the aircraft from my first officer, and landed without incident. The propeller finally stopped windmilling as we taxied to our gate, escorted by the airport's fire department. Callback conversation with reporter revealed the following information: the reporter stated the exact cause of the engine failure is unknown and will not be available for some time but the engine was changed. The reporter believes the propeller governor was at fault for the failure to feather the propeller.

Original NASA ASRS Text

Title: AN ATR42 ON APCH AT 6000 FT DECLARED AN EMER DUE TO #1 ENG FAILURE AND AGGRAVATED BY THE FAILURE OF THE PROP TO FEATHER. THE ENG WAS REPLACED.

Narrative: ABOUT 6 MINS OUT OF ORD, WE EXPERIENCED A MASTER WARNING, MASTER CAUTION ON THE CENTRAL ALERT PANEL WITH A LOSS OF ENG PERFORMANCE. I COMPLIED WITH OUR QRH AND SHUT THE ENG DOWN. HOWEVER, THE PROP ON THE FAILING #1 ENG WOULD NOT 'FEATHER.' AFTER ADVISING ATC TO ROLL THE CFR, TELLING THE FLT ATTENDANT TO PREPARE THE CABIN FOR A SINGLE ENG LNDG, AND CALLING COMPANY, I COMPLETED THE APCH CHKLIST AND, JUST INSIDE THE OM FOR RWY 27L, I TOOK CTL OF THE ACFT FROM MY FO, AND LANDED WITHOUT INCIDENT. THE PROP FINALLY STOPPED WINDMILLING AS WE TAXIED TO OUR GATE, ESCORTED BY THE ARPT'S FIRE DEPT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE EXACT CAUSE OF THE ENG FAILURE IS UNKNOWN AND WILL NOT BE AVAILABLE FOR SOME TIME BUT THE ENG WAS CHANGED. THE RPTR BELIEVES THE PROP GOVERNOR WAS AT FAULT FOR THE FAILURE TO FEATHER THE PROP.

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.