Ground Resonance Rattles Brazilian Chopper to Bits

Friday, February 24, 2012
By George Hatcher

What: Corpo de Bombeiros Militar do Estado do Pará Helibras HB 350BA Esquilo
Where: Benevides Brazil
When: Feb 22, 2012
Who: 4 aboard, no fatalities
Why: The rescue chopper vibrated itself apart after landing.

“Ground resonance” occurs when a sitting helicopter’s rotors become unbalanced while spinning. A resident expert says this can happen because of a hard landing; the best way to get it to stop is to pull collective and break contact with the ground. (At the time, that would feel counter intuitive, I would think!)

Print Friendly

Leave a Reply

RSS Plane Crash News


  • Air
  • AirCrashConsultants
  • Airfleets
  • AOPA
  • Bird Strike Database
  • Bird Strike Database Query
  • EASA
  • FAA
  • Find A Pilot
  • Frixo
  • IATA
  • International Civil Aviation Organization
  • Montreal Convention MC99 English
  • Nasa
  • NOAA
  • NTSB
  • RITA
  • U.S. Office of Special Counsel
April 2017
« Mar    
  • Flight requests clearance for landing after declaring 'emergency'
    about 2 hours ago
  • #FAA What might happen if a drone hits a person on the ground?
    about 8 hours ago
  • #Aviationsafety Aircraft impacts open field in Harmon County Hollis, Oklahoma. Substantial damage pilot fatality.
    about 9 hours ago
  • #Aviationsafety Pilotleasing craft experienced a loss of the left main landing gear wheel on departure from Belize. Diverted to Sarasota
    about 9 hours ago
  • @Aviationsafety Delta Air Lines DL188 returned to land at Beijing Capital International Airport in China after suff…
    about 9 hours ago