18 Nov 2018: Robinson R44 Undesignat

18 Nov 2018: Robinson R44 Undesignat — Unknown operator

No fatalities • Knox City, TX, United States

Probable cause

The pilot's failure to maintain adequate airspeed with a tailwind, which resulted in the helicopter settling with power, and his subsequent incorrect collective application while attempting to recover, which resulted in a loss of helicopter control due to a loss of tail rotor effectiveness.

— NTSB Determination

Accident narrative

The helicopter pilot reported that while conducting a photography flight about 70ft AGL, the helicopter's heading was 190° and the airspeed was less than 9 knots. With a 14-knot tailwind the helicopter began to settle with power. He increased collective and applied forward cyclic to increase the airspeed, but the helicopter impacted the ground.

The helicopter sustained substantial damage to the main rotor system and the fuselage.

The pilot reported that the wind about the time of the accident was from the north at 14 knots.

The pilot reported that there were no mechanical malfunctions or failures with the helicopter that would have precluded normal operation.

According to the Helicopter Flying Handbook, Chapter 11, page 11-10:

When recovering from a settling with power condition, the pilot tends first to try to stop the descent by increasing collective pitch. However, this only results in increasing the stalled area of the rotor, thereby increasing the rate of descent. Since inboard portions of the blades are stalled, cyclic control may be limited. Recovery is accomplished by increasing airspeed, and/or partially lowering collective pitch. In many helicopters, lateral cyclic combined with lateral tailrotor thrust will produce the quickest exit from the hazard assuming that there are no barriers in that direction. In a fully developed vortex ring state, the only recovery may be to enter autorotation to break the vortex ring state.

Contributing factors

  • cause Pilot
  • cause Pilot
  • cause Airspeed — Not attained/maintained
  • cause Prop/rotor parameters — Not attained/maintained
  • Effect on operation

Conditions

Weather
VMC, wind 350/10kt, vis 10sm

Loading the flight search…

What you can do on Flight Finder

  • Search flights between any two airports with live fares.
  • By aircraft — pick a plane model (e.g. Boeing 787, Airbus A350) and see every route it flies from your origin.
  • Route map — click any airport worldwide to explore its destinations, or draw a radius to find nearby airports.
  • Global aviation safety — aviation accident database, 5,200+ records since 1980, with map and rankings by aircraft and operator.
  • NTSB safety feed — recent U.S. aviation accidents and incidents from the official NTSB CAROL database, updated daily.

Frequently asked questions

How do I search flights by aircraft type on FlightFinder?

Pick an aircraft model — Boeing 737, Airbus A320, A380, Boeing 787 Dreamliner and more — enter your origin airport, and FlightFinder shows every route that plane flies from there with live fares.

Which aircraft types can I filter by?

We support Boeing 737/747/757/767/777/787, the full Airbus A220/A319/A320/A321/A330/A340/A350/A380 family, Embraer E170/E175/E190/E195, Bombardier CRJ and Dash 8, and the ATR 42/72 turboprops.

Is FlightFinder free to use?

Search and schedules are free. Pro ($4.99/month, $39/year, or $99 one-time lifetime) unlocks the enriched flight card — on-time stats, CO₂ per passenger, amenities, live gate & weather — plus My Trips with push alerts.

Where does the route data come from?

Live schedules come from Amadeus, AeroDataBox and Travelpayouts. Observed routes (which aircraft actually flew a given city pair) are crowdsourced from adsb.lol ADS-B data under the Open Database License.