Narrative:

Private pilot initial training flight commenced as normal with touch-and-go operations at the ZZZ airport. Returning to home base; ZZZ1; the flight was cleared to land runway xx with a direct headwind. The descent began 2.5 miles from the runway threshold at 1;000 ft with power reduced and flaps set. The glide path PAPI indicators displayed a normal descent at 65 knots (landing speed for the C-172). The landing occurred within the first third of the runway just before taxiway on the runway surface. Afterwards; a rollout was initiated and flaps removed. Thereafter; the nose gear began to shimmy and immediately the student pulled back on the control yoke initiating a climb. The instructor pilot pushed the nose down to avoid a stalled condition after hearing the audible stall warning indication. This led to a bounced landing and then a gradual pull back on the yoke to settle the main tires on the runway surface. This was accomplished before the halfway point of runway xx. However; the aircraft's ground speed was still quite high and brakes were applied- but to no effect. Aerodynamic braking was then applied and the nose gear shimmied again; violently. Back pressure was then applied to remove the shimmy. The brakes were then forcibly pumped to create hydraulic pressure and to some 'limited' effect they worked; however; it did not keep the aircraft from coming to a complete stop 5 feet off the end of runway xx surface on the grassy end before the marsh. ATIS (automatic terminal information service) information winds 060 degrees at 6 knots; weather better than 5;000 feet and 5 SM visibility; temperature 17 celsius; dew-point 12 celsius and altimeter setting 30.04 in hg. No injuries were reported nor observed and no damage to the aircraft except a minor wear in tread depth in the right tire (bald spot) was observed and promptly rectified.

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Original NASA ASRS Text

Title: C172 flight instructor reported a loss of control and runway excursion due to student pilot induced oscillations during landing rollout.

Narrative: Private pilot initial training flight commenced as normal with touch-and-go operations at the ZZZ airport. Returning to home base; ZZZ1; the flight was cleared to land Runway XX with a direct headwind. The descent began 2.5 miles from the runway threshold at 1;000 ft with power reduced and flaps set. The glide path PAPI indicators displayed a normal descent at 65 knots (landing speed for the C-172). The landing occurred within the first third of the runway just before taxiway on the runway surface. Afterwards; a rollout was initiated and flaps removed. Thereafter; the nose gear began to shimmy and immediately the student pulled back on the control yoke initiating a climb. The Instructor Pilot pushed the nose down to avoid a stalled condition after hearing the audible stall warning indication. This led to a bounced landing and then a gradual pull back on the yoke to settle the main tires on the runway surface. This was accomplished before the halfway point of Runway XX. However; the aircraft's ground speed was still quite high and brakes were applied- but to no effect. Aerodynamic braking was then applied and the nose gear shimmied again; violently. Back pressure was then applied to remove the shimmy. The brakes were then forcibly pumped to create hydraulic pressure and to some 'limited' effect they worked; however; it did not keep the aircraft from coming to a complete stop 5 feet off the end of Runway XX surface on the grassy end before the marsh. ATIS (Automatic Terminal Information Service) information winds 060 degrees at 6 knots; weather better than 5;000 feet and 5 SM visibility; temperature 17 Celsius; dew-point 12 Celsius and altimeter setting 30.04 in HG. No injuries were reported nor observed and no damage to the aircraft except a minor wear in tread depth in the right tire (bald spot) was observed and promptly rectified.

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.