Robinson R22
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 193.4; Flight Crew Total 776.7; Flight Crew Type 709.7
Workload; Training / Qualification; Situational Awareness; Time Pressure
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Strike - Aircraft; Inflight Event / Encounter Loss Of Aircraft Control
Aircraft Aircraft Damaged
Human Factors
I was practicing air taxiing and quick stops with a 31-hour student pilot on a taxiway. During the recovery phase of the quick stop; the student did not raise enough collective to arrest the descent. I took controls at around 30 feet AGL and increased the collective to our 5-minute limit; but we continued to descend and impacted the ground hard enough to spread the skids. A piece of non-structural sheet metal detached from the underside of the helicopter and landed beside the taxiway. I reported what happened to the tower and they sent someone to retrieve the sheet metal. I flew the helicopter back to the flight school's ramp and did not observe any damage other than the spread skids. I should have taken the controls earlier and not allowed the descent rate to develop to an unrecoverable state. I was trying to talk the student through the correct control inputs when I should have just abandoned the maneuver and recovered.
Helicopter Flight Instructor reported their student was practicing 'quick stops' but did not recover the descent in a timely manner. The Instructor reported they took control too late and this resulted in a hard landing causing minor damage to the helicopter.