Takeoff aborted in a night operation in a commuter light transport.

Attributes
ACN	320072
Time
Date	199511
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 9000 flight time type : 3800
ASRS Report	320072
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 280 flight time total : 15000 flight time type : 5000
ASRS Report	320401
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 flight crew : rejected takeoff
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On takeoff roll the constant torque was set at maximum for a contaminated runway. On the takeoff roll the left torque fluctuated 3-5 percent in what should have been a constant torque setting. The captain thinking perhaps that the power lever was above the ctot (constant torque on takeoff) setting, pulled the left power lever back slightly. The setting then went to more than 20 percent below the constant torque on takeoff setting and disabled the constant torque on takeoff. The captain directed to abort the takeoff and I pulled the power levers to ground idle and abort.

Original NASA ASRS Text

Title: TKOF ABORTED IN A NIGHT OP IN A COMMUTER LTT.

Narrative: ON TKOF ROLL THE CONSTANT TORQUE WAS SET AT MAX FOR A CONTAMINATED RWY. ON THE TKOF ROLL THE L TORQUE FLUCTUATED 3-5 PERCENT IN WHAT SHOULD HAVE BEEN A CONSTANT TORQUE SETTING. THE CAPT THINKING PERHAPS THAT THE PWR LEVER WAS ABOVE THE CTOT (CONSTANT TORQUE ON TKOF) SETTING, PULLED THE L PWR LEVER BACK SLIGHTLY. THE SETTING THEN WENT TO MORE THAN 20 PERCENT BELOW THE CONSTANT TORQUE ON TKOF SETTING AND DISABLED THE CONSTANT TORQUE ON TKOF. THE CAPT DIRECTED TO ABORT THE TKOF AND I PULLED THE PWR LEVERS TO GND IDLE AND ABORT.

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.