Federal Aviation Administration / Flight Standards District Office; Orlando, Florida
Rotorcraft landed and went into pylon whirl causing damage to the tail boom.
City of Gainesville Police Department
https://registry.faa.gov/N911GV
Date: 25-JUN-19
Time: 02:30:00Z
Regis#: N911GV
Aircraft Make: BELL
Aircraft Model: OH58C
Event Type: INCIDENT
Highest Injury: NONE
Aircraft Missing: No
Damage: MINOR
Activity: PUBLIC USE
Flight Phase: LANDING (LDG)
City: GAINESVILLE
State: FLORIDA
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Had to look this one up. Glad our PD isn’t trying to expend it’s limited budget playing with war machines. Another recently lost due to being tied to a dolly while attempting flight. I don’t think helicopter is too blame.
ReplyDelete8-30.PYLON WHIRL.
Pylon whirl is a condition which occurs after blade flapping and mast bumping. The resultant motion of the pylon is elliptical, and spike knock is apt to occur. If the frequency of motion coincides with a particular natural frequency of the helicopter, and the amplitude and direction of the force is large enough, damaging vibrations can occur in the aft section tailboom of the helicopter. Motion of this type could occur during touchdown autorotations, if operational limits are exceeded.