<< >> NASA ASRS Report 1335902, February 2016

Maintenance technician reported that a dash-8-200's propeller auto-feathered on takeoff. Following maintenance action the problem reoccurred on a later date.

Attributes
ACN	1335902
Time
Date	201602
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Dash 8-200
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Propeller Autofeather System
Person 1
Function	Technician
Qualification	Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Aircraft returned to field for #1 engine feathering uncommanded on take-off. The discrepancy occurred at xa:30 and when I came on duty at xj:00 I called maintenance for an update. They reported that they inspected #1 engine wire harness; pla (power level angle); cla (condition lever angle) micro switches and replaced the #2 tscu (torque signal conditioning unit) and ops check was satisfactory. I entered the data into our operating system. This same issue reoccurred on a later date.

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Original NASA ASRS Text

Title: Maintenance Technician reported that a Dash-8-200's propeller auto-feathered on takeoff. Following maintenance action the problem reoccurred on a later date.

Narrative: Aircraft returned to field for #1 engine feathering uncommanded on take-off. The discrepancy occurred at XA:30 and when I came on duty at XJ:00 I called maintenance for an update. They reported that they inspected #1 engine wire harness; PLA (Power Level Angle); CLA (Condition Lever Angle) micro switches and replaced the #2 TSCU (Torque Signal Conditioning Unit) and ops check was satisfactory. I entered the data into our operating system. This same issue reoccurred on a later date.

Data retrieved from NASA's ASRS site 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.