The NTSB's factual report, available at the FMI link below, also
identifies a series of modifications to the CGS Hawk Arrow that may
have also contributed to the June 27, 2005 mishap in Wyoming's
Grand Teton National Park.
The manufacturer says it could have been a loose control
collar or the vast modifications Walton made to the aircraft after
a hard landing months earlier in Nebraska that contributed to the
The NTSB reports the aircraft's fabric cockpit enclosure panels
had been removed prior to the accident, including a section of
fabric between the wings.
"We never tested a Hawk Arrow in the configuration he was flying
it," the manufacturer said. He added an improperly installed
locking collar may mean Walton "...could have been pulling full
back on the stick, but all it did was take up some slack. There may
have been no response at the other end, no movement of the