Pilot Debrief

Rotorcraft Development Corp UH-1B near Richvale, CA — 2009-05-13

Final reportWPR09LA241
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Date
2009-05-13
Location
Richvale, CA, USA
Airport
07CL
Aircraft
Rotorcraft Development Corp UH-1B
Registration
N843M
Category
Helicopter
Highest injury
Serious
Fatalities
0
Phase of flight
Takeoff roll

Probable cause

The pilot's failure to maintain control of the helicopter during takeoff for undetermined reasons.

NTSB narrative

The helicopter had undergone a 100-hour inspection the day prior to the accident, which included a flushing of the hydraulic system. The pilot reported that as he lifted the helicopter into a hover, he initiated forward movement. The pilot stated that the controls felt "ratchety" and stiff, as if the helicopter had the hydraulic system turned off. He was not able to land the helicopter by lowering the collective, nor was he able to control direction with the cyclic. The helicopter had climbed about 15 feet above the ground and subsequently collided with a hangar about 160 feet away. The fuselage section remained embedded in the building, while the tail section came to rest on the ground below. A post accident examination revealed no mechanical malfunctions or failures that would have precluded normal flight. A representative for Bell stated that it is common during the "initial start up of all of these aircraft after assembly and/or reassembly or after first servicing," to cycle all of the controls for as long as 2 minutes to attain smooth and uninterrupted control motion. He further stated that during these initial run up exercises it would not be unusual to feel "ratcheting or binding in the cyclic that is generally accompanied by a howling noise" as the hydraulics purge air from the lines, pumps, and actuators. It is unknown if the pilot adequately cycled the controls through their full travel prior to flight.

Analysis

Primary failure mode
Human factors
First missed decision gate
Pilot should have cycled controls to purge air from hydraulic system before takeoff.

NTSB coding

Evidence available

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

Docket documents8

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