Uncommanded autofeather.

Attributes
ACN	291390
Time
Date	199412
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ewr tower : lnk
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	other other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 250 flight time total : 2350 flight time type : 300
ASRS Report	291390
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 5200 flight time type : 400
ASRS Report	291391
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 none taken : insufficient time other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Left propeller feathered causing a loss of power. Aircraft was landed by captain in this condition. This happened shortly after doing landing check flow. My inclination is that the autofeather malfunctioned because engine was running properly and continued to run.

Original NASA ASRS Text

Title: UNCOMMANDED AUTOFEATHER.

Narrative: L PROP FEATHERED CAUSING A LOSS OF PWR. ACFT WAS LANDED BY CAPT IN THIS CONDITION. THIS HAPPENED SHORTLY AFTER DOING LNDG CHK FLOW. MY INCLINATION IS THAT THE AUTOFEATHER MALFUNCTIONED BECAUSE ENG WAS RUNNING PROPERLY AND CONTINUED TO RUN.

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.