As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RETURNED AFTER REFUELING BACK TO THE GROUPS LANDED. SKIDS STILL PENETRATED THE SNOW SURFACE AND THE BELLY OF THE ACFT WAS JUST ABOUT TOUCHING THE SNOW SURFACE. THE LANDING WAS UNEVENTFUL. LAST GUIDE PULLED HIMSELF IN TO THE HELICOPTER THAT IS WHEN A LOUD BANG WAS HEARD AND THE HELICOPTER SETTLED ABOUT 10" AT THE BACK. RECOGNIZED WHAT HAPPENED AND SHUTDOWN THE ACFT.