A fractional jet captain reported that uneven pavement on gnt's runway 13 caused his aircraft to osc...

Narrative:

When departing gnt on runway 13; during the takeoff roll we accelerated down the runway and due to the condition of the runway the aircraft had a tendency to oscillate up and down; slow at first then increasing in intensity. At first it felt like any other runway that is not completely smooth and this aircraft model does a good job at absorbing the shocks of this kind of runway condition. As we passed 80 knots; the oscillations increased until at the point of V1 and vr; the aircraft literally bounced into the air off a runway mogul. The aircraft; since the airspeed was low; returned to the runway before immediately becoming airborne again. We continued the flight without further issues. As this incident wasn't noticeable until the point at which we were committed to fly (between V1 and vr); I believe we did the right thing in continuing the takeoff; even though it did bounce. It was hard to tell about the condition of the runway upon landing at gnt even though I did realize that the nose gear was hard to get on the ground (bouncing tendency) but I just thought that was due to me trying the get the nose on the ground quickly since I was concerned about getting the aircraft stopped in a short distance. It is my opinion that this airport should be evaluated for the condition of the runway as I believe that it is unsafe for our operations.

Original NASA ASRS Text

Title: A Fractional Jet Captain reported that uneven pavement on GNT's Runway 13 caused his aircraft to oscillate up and down until V1/Vr when the nose was prematurely bounced into the air only to return prior to lift off.

Narrative: When departing GNT on Runway 13; during the takeoff roll we accelerated down the runway and due to the condition of the runway the aircraft had a tendency to oscillate up and down; slow at first then increasing in intensity. At first it felt like any other runway that is not completely smooth and this aircraft model does a good job at absorbing the shocks of this kind of runway condition. As we passed 80 knots; the oscillations increased until at the point of V1 and VR; the aircraft literally bounced into the air off a runway mogul. The aircraft; since the airspeed was low; returned to the runway before immediately becoming airborne again. We continued the flight without further issues. As this incident wasn't noticeable until the point at which we were committed to fly (between V1 and VR); I believe we did the right thing in continuing the takeoff; even though it did bounce. It was hard to tell about the condition of the runway upon landing at GNT even though I did realize that the nose gear was hard to get on the ground (bouncing tendency) but I just thought that was due to me trying the get the nose on the ground quickly since I was concerned about getting the aircraft stopped in a short distance. It is my opinion that this airport should be evaluated for the condition of the runway as I believe that it is unsafe for our operations.

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	956633
Time
Date	201106
Local Time Of Day	1801-2400
Place
Locale Reference	GNT.Airport
State Reference	NM
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Ground Event / Encounter Other / Unknown

A fractional jet captain reported that uneven pavement on gnt's runway 13 caused his aircraft to oscillate up and down until V1/vr when the nose was prematurely bounced into the air only to return prior to lift off.