A metroliner captain reported losing control of the aircraft at the start of the takeoff roll; due t...

Narrative:

Airplane started normally and all checklists completed. No difficulties on taxi. Was told to line up and wait on rwy. I heard tower call the winds at 080/6 just a few minutes before I took the runway. I was cleared for takeoff; I acknowledged that and set the speed levers to high and noted rpm in normal range. I advanced the power levers and noted the right engine torque was lagging significantly behind the left engine torque. The airplane started veering to the right. I brought both throttles to idle and into reverse. I tried to use differential power; nose wheel steering and brakes to keep the aircraft on the runway. However; I wasn't able to correct the large right turn to keep the aircraft on the pavement. As I saw that I was about to depart the runway; I attempted to steer the airplane to miss the obstacles on the side of the runway. I hit one runway light; but managed to miss the large black taxiway sign that was just a few feet left of the airplane. I'm sure that I had the nose wheel steering button depressed on the throttle; because I never reached a speed and power setting where I would have released it. I saw that the nose wheel was cocked to the right after I got out of the aircraft. With the engines shut down; I also saw that one propeller tip on the left engine was bent.

Original NASA ASRS Text

Title: A Metroliner Captain reported losing control of the aircraft at the start of the takeoff roll; due to an asymmetrical thrust condition; which resulted in damage to the aircraft.

Narrative: Airplane started normally and all checklists completed. No difficulties on taxi. Was told to line up and wait on Rwy. I heard tower call the winds at 080/6 just a few minutes before I took the runway. I was cleared for takeoff; I acknowledged that and set the speed levers to high and noted rpm in normal range. I advanced the power levers and noted the right engine torque was lagging significantly behind the left engine torque. The airplane started veering to the right. I brought both throttles to idle and into reverse. I tried to use differential power; nose wheel steering and brakes to keep the aircraft on the runway. However; I wasn't able to correct the large right turn to keep the aircraft on the pavement. As I saw that I was about to depart the runway; I attempted to steer the airplane to miss the obstacles on the side of the runway. I hit one runway light; but managed to miss the large black taxiway sign that was just a few feet left of the airplane. I'm sure that I had the nose wheel steering button depressed on the throttle; because I never reached a speed and power setting where I would have released it. I saw that the nose wheel was cocked to the right after I got out of the aircraft. With the engines shut down; I also saw that one propeller tip on the left engine was bent.

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.

Attributes
ACN	1499984
Time
Date	201711
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	SA-227 AC Metro III
Operating Under FAR Part	Part 135
Flight Phase	Takeoff
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Ground Event / Encounter Object Ground Event / Encounter Ground Strike - Aircraft Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway

A metroliner captain reported losing control of the aircraft at the start of the takeoff roll; due to an asymmetrical thrust condition; which resulted in damage to the aircraft.