A da-40 student unconsciously applied left brake so the instructor rejected the takeoff but could no...

Attributes
ACN	1092021
Time
Date	201306
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	DA40 Diamond Star
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	None
Flight Plan	None
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 640 Flight Crew Type 640
Events
Anomaly	Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Ground Event / Encounter Object Ground Excursion Runway Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Object

Narrative:

During a training flight with a student; stopped for a break at a nearby airport. After taxiing back for departure; completed takeoff checks per checklist. Student was in control of aircraft; but I followed on the controls. Began normal takeoff roll on runway 32. All instruments looked normal; airspeed was around 35-40 knots. The plane had a momentary pulse of the brakes and I thought student tapped the brakes. I told the student to put his heels on the floor. He said ok and I saw him move his feet further on the floor. Plane continued straight for a few seconds. Then the plane suddenly veered left. I took control and tried applying right rudder; then throttled back to idle and applied brakes. The airplane did not turn back to the centerline and did not slow down. I think the student stopped trying to control the airplane and removed his feet/hands from the controls. We hit a runway light and continued into the grass. We finally came to a stop about 150 feet into the grass. Neither of use was at all injured. We secured the aircraft and exited it. The nose pant was cracked; the back of the propeller was scratched; and there was a small dent in the left wing.

Original NASA ASRS Text

Title: A DA-40 student unconsciously applied left brake so the instructor rejected the takeoff but could not regain control and during the runway excursion the propeller and nose wheel pant were damaged along with a wing dent.

Narrative: During a training flight with a student; stopped for a break at a nearby airport. After taxiing back for departure; completed takeoff checks per checklist. Student was in control of aircraft; but I followed on the controls. Began normal takeoff roll on Runway 32. All instruments looked normal; airspeed was around 35-40 knots. The plane had a momentary pulse of the brakes and I thought student tapped the brakes. I told the student to put his heels on the floor. He said OK and I saw him move his feet further on the floor. Plane continued straight for a few seconds. Then the plane suddenly veered left. I took control and tried applying right rudder; then throttled back to idle and applied brakes. The airplane did not turn back to the centerline and did not slow down. I think the student stopped trying to control the airplane and removed his feet/hands from the controls. We hit a runway light and continued into the grass. We finally came to a stop about 150 feet into the grass. Neither of use was at all injured. We secured the aircraft and exited it. The nose pant was cracked; the back of the propeller was scratched; and there was a small dent in the left wing.

Data retrieved from NASA's ASRS site as of July 2013 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.

A da-40 student unconsciously applied left brake so the instructor rejected the takeoff but could not regain control and during the runway excursion the propeller and nose wheel pant were damaged along with a wing dent.