Skip to content

GAA18CA012

2017-10-12 · Canton, Illinois, United States · None · 1 aircraft · Status: Completed

Airport CTK

Current FAA registration · N140SF

Make / Model
EUROCOPTER DEUTSCHLAND GMBH MBB-BK 117 C-2
Year of manufacture
2010 · 7 years old at event
Engine
TURBOMECA ARRIEL 1E2 (708 hp)
Seats / Engines
8 seats · 2 engines
Last airworthiness date
20110923
ADS-B equipped
Yes — Mode-S A0A446

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The flight instructor's incorrect cyclic control during a hover, which resulted in a hard landing.

Factual narrative

The helicopter flight instructor reported that he was training a new company pilot at night, and they were using night vision goggles. He added that, while in a hover, he attempted to demonstrate the use of the controllable search light to the pilot in the right seat. The flight instructor added that, "to adjust the light, I took the [left] cyclic in my left hand which would normally be holding the left collective and attempted to reach the control switch for the light and grabbed the throttles of the right collective with my right hand. My right hand would normally be on the left cyclic." He further added that, he then inadvertently pushed down on the collective and the helicopter began to settle on the runway. He reported in response "my reflex was to pull up with my left hand (which would normally be on the collective)," and when he did so the helicopter moved rearward. Subsequently, he "pushed the cyclic forward to correct" the rearward movement, but in doing so, the helicopter touched down hard and the main rotor impacted the upper wire strike protection unit. The main rotor sustained substantial damage. The flight instructor reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation. The helicopter flight instructor reported that he was training a new company pilot at night, and they were using night vision goggles. He added that, while in a hover, he attempted to demonstrate the use of the controllable search light to the pilot in the right seat. The flight instructor added that, "to adjust the light, I took the [left] cyclic in my left hand which would normally be holding the left collective and attempted to reach the control switch for the light and grabbed the throttles of the right collective with my right hand. My right hand would normally be on the left cyclic." He further added that he then inadvertently pushed down on the collective, and the helicopter began to settle on the runway. He reported that in response "[his] reflex was to pull up with [his] left hand (which would normally be on the collective)," and when he did so the helicopter moved rearward. Subsequently, he "pushed the cyclic forward to correct" the rearward movement, but in doing so, the helicopter touched down hard, and the main rotor impacted the upper wire strike protection unit. The main rotor sustained substantial damage. The flight instructor reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • C Personnel issues-Task performance-Use of equip/info-Aircraft control-Instructor/check pilot - C
  • C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Pitch control-Incorrect use/operation - C
  • — Environmental issues-Physical environment-Object/animal/substance-(general)-Contributed to outcome

Verbatim from NTSB's published report. Source file NTSB_2017_GAA18CA012.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.