Ec-130 pilot reported attempting to set down on a dolly with a tailwind; but hit a skid on the dolly...

Narrative:

Was returning to base after completing patient flight with strong winds. Our base has a very small pad and the dolly cannot be turned to face into the winds. I landed back at the base into the wind in the grassy area to the east of the pad/dolly so the medical crew could get out. I told them I was going to attempt to land on the dolly one time; then if it didn't feel right; I would land back to the grassy area. After the crew got out; I hovered over to the dolly and attempted to land with a tailwind. As I was about to touch down on the dolly; a wind gust caused the helicopter to yaw right about 20-30 degrees and descend. The skids hit the dolly and I immediately pulled in collective to stop the descent and to move back to the grassy area. However; as I pulled in collective; the helicopter felt like it was hung on something and began to feel like what I imagine dynamic rollover feels like. I lowered the collective to stop that from happening and shut down. After looking at the helicopter; it appears that the right rear skid got hung in the gap in the middle of the dolly. That caused the dynamic rollover feeling. Another thing I noticed was the dolly had shifted several feet. I don't know when that happened; before the skids contacted the ground; or when the skids contacted the dolly.

Original NASA ASRS Text

Title: EC-130 pilot reported attempting to set down on a dolly with a tailwind; but hit a skid on the dolly and pulled the collective to ascend. Sensing what the pilot thought could be dynamic rollover developing; he landed the helicopter. It was determined that a skid had caught on the dolly.

Narrative: Was returning to base after completing patient flight with strong winds. Our base has a very small pad and the dolly cannot be turned to face into the winds. I landed back at the base into the wind in the grassy area to the east of the pad/dolly so the medical crew could get out. I told them I was going to attempt to land on the dolly one time; then if it didn't feel right; I would land back to the grassy area. After the crew got out; I hovered over to the dolly and attempted to land with a tailwind. As I was about to touch down on the dolly; a wind gust caused the helicopter to yaw right about 20-30 degrees and descend. The skids hit the dolly and I immediately pulled in collective to stop the descent and to move back to the grassy area. However; as I pulled in collective; the helicopter felt like it was hung on something and began to feel like what I imagine dynamic rollover feels like. I lowered the collective to stop that from happening and shut down. After looking at the helicopter; it appears that the right rear skid got hung in the gap in the middle of the dolly. That caused the dynamic rollover feeling. Another thing I noticed was the dolly had shifted several feet. I don't know when that happened; before the skids contacted the ground; or when the skids contacted the dolly.

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.

Attributes
ACN	1405035
Time
Date	201611
Local Time Of Day	1201-1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EC130
Operating Under FAR Part	Part 135
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	Single Pilot
Qualification	Flight Crew Rotorcraft Flight Crew Instrument Flight Crew Commercial
Events
Anomaly	Ground Event / Encounter Object

Ec-130 pilot reported attempting to set down on a dolly with a tailwind; but hit a skid on the dolly and pulled the collective to ascend. Sensing what the pilot thought could be dynamic rollover developing; he landed the helicopter. It was determined that a skid had caught on the dolly.