NTSB CAROL · Event
Event ANC06CA090
Aircraft involved
Probable cause & findings
The failure of the certificated flight instructor (CFI) to maintain control of the helicopter, which resulted in an in-flight collision with terrain. A factor associated with the accident was the dual student's improper use of the cyclic trim.
Factual narrative
The first pilot, a certificated helicopter flight instructor, was providing primary helicopter flight instruction to the second pilot, a certificated commercial airplane pilot. The first pilot said that while in a stable 3-foot hover above ground, he asked the second pilot to relinquish control of the helicopter so he could demonstrate a maneuver. During the transfer of control, the cyclic slipped from the first pilot's hand, and the cyclic traveled to a full forward position. The helicopter pitched nose down, and the main rotor blades struck the ground. The helicopter subsequently rolled to the right, and sustained substantial damage to the main rotor drive system, main rotor blades, and fuselage. A postaccident inspection of the helicopter revealed that the second pilot had inadvertently selected the cyclic trim system to the full forward position. The operator reported that there were no preaccident mechanical anomalies with the helicopter. The first pilot, a certificated helicopter flight instructor, was providing primary helicopter flight instruction to the second pilot, a certificated commercial airplane pilot. The first pilot said that while in a stable 3-foot hover above ground, he asked the second pilot to relinquish control of the helicopter so he could demonstrate a maneuver. During the transfer of control, the cyclic slipped from the first pilot's hand, and the cyclic traveled to a full forward position. The helicopter pitched nose down, and the main rotor blades struck the ground. The helicopter subsequently rolled to the right, and sustained substantial damage to the main rotor drive system, main rotor blades, and fuselage. A postaccident inspection of the helicopter revealed that the second pilot had inadvertently selected the cyclic trim system to the full forward position. The operator reported that there were no preaccident mechanical anomalies with the helicopter. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2006_ANC06CA090.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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