An A320 crew reported a significant right yaw just at vr. No abnormal indications were seen and the ...

Narrative:

Aircraft deferred with inoperative right reverser. First officer flying. Winds light and variable. Normal takeoff roll with normal acceleration. Precisely when I called vr; aircraft made a very pronounced yaw to the right. I checked engine instruments for engine failure or deployed reverser. All indications were normal. On climbout we discussed it and concluded we either had a tire failure at rotation or uncommanded rudder input. Notifed ATC; dispatch; and maintenance. No tire material was found on the runway; however; I did not rule out the possibilty as if it had failed at that speed at liftoff; the pieces could have landed elsewhere. Asked to have fire equipment standing by at our destination. Flight attendants briefed for cabin advisory. Notified passengers on descent that they would see fire equipment on landing and not to be alarmed. We decided to extend gear early in case we had a tire problem that would preclude gear from extending. First officer made very smooth landing. Taxi to gate was uneventful and fire and rescue released. I was well rested so no fatigue issue. This was my first acceptance of an aircraft with inop reverser. No other human factors invlolved.

Original NASA ASRS Text

Title: An A320 Crew reported a significant right yaw just at Vr. No abnormal indications were seen and the flight continued to its destination with no anomalies discovered by the crew.

Narrative: Aircraft deferred with inoperative right reverser. First Officer flying. Winds light and variable. Normal takeoff roll with normal acceleration. Precisely when I called Vr; aircraft made a very pronounced yaw to the right. I checked engine instruments for engine failure or deployed reverser. All indications were normal. On climbout we discussed it and concluded we either had a tire failure at rotation or uncommanded rudder input. Notifed ATC; Dispatch; and Maintenance. No tire material was found on the runway; however; I did not rule out the possibilty as if it had failed at that speed at liftoff; the pieces could have landed elsewhere. Asked to have fire equipment standing by at our destination. Flight attendants briefed for cabin advisory. Notified passengers on descent that they would see fire equipment on landing and not to be alarmed. We decided to extend gear early in case we had a tire problem that would preclude gear from extending. First Officer made very smooth landing. Taxi to gate was uneventful and fire and rescue released. I was well rested so no fatigue issue. This was my first acceptance of an aircraft with inop reverser. No other human factors invlolved.

Data retrieved from NASA's ASRS site as of April 2012 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	884280
Time
Date	201004
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Engine
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 120 Flight Crew Total 15000 Flight Crew Type 1500
Person 2
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 5000 Flight Crew Type 2000
Events
Anomaly	No Specific Anomaly Occurred All Types

An A320 crew reported a significant right yaw just at vr. No abnormal indications were seen and the flight continued to its destination with no anomalies discovered by the crew.