Pilot Debrief

BELL 206 near Orange Springs, FL — 2017-05-02

Final reportERA17TA170
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Date
2017-05-02
Location
Orange Springs, FL, USA
Aircraft
BELL 206
Registration
N911GE
Category
Helicopter
Highest injury
Serious
Fatalities
0
Phase of flight
Maneuvering

Probable cause

The pilot's failure to maintain adequate clearance between the helicopter's skid and the firefighting bucket and suspension cable, which resulted in the cable becoming entangled on the landing skid and a subsequent loss of helicopter control.

NTSB narrative

The commercial helicopter pilot had completed 25 to 30 water drops in a fire zone using a firefighting bucket on suspension cables. After refueling, he completed three or four additional drops and then filled and pulled the bucket from the water and immediately felt "a severely out of CG [center of gravity] condition to the right." He assumed that the bucket cables were entangled in the right landing skid, so he released the water from the bucket. The condition persisted, so he rocked the helicopter to attempt to free the cable without success. He then released the cable with the cargo release button and heard the "clunk" sound typically heard when the bucket was released, but then he heard another "clunk." The helicopter then began to spin violently and crashed into the water. Examination of the wreckage revealed 6-inch long cable marks on the right rear landing skid tube and a torsional fracture of the tail rotor short shaft. Based on the pilot's statement, the cable marks likely occurred initially when a cable became entangled on the skid tube, followed by the fracture of the tail rotor shaft due to cable or bucket contact with the tail rotor assembly. The pilot reported that there were no preaccident mechanical malfunctions or anomalies with the helicopter that would have precluded normal operation.

Analysis

Primary failure mode
Loss of control
First missed decision gate
Pilot could have checked for entanglement before attempting to release the bucket.

NTSB coding

Evidence available

  • Photos
  • 4 docket documents
View NTSB final reportView NTSB docket

Docket documents4

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