CEN20CA064

NTSB accident investigation · Guimbal Cabri G2 · Independence, IA · January 21, 2020

Accident · Serious injuriesData collectionFinal report
Date
January 21, 2020, 16:15 local (22:15 UTC)
Place
Independence, IA
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N715RKGuimbal Cabri G2
Defining event
Landing: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report August 27, 2020
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration - Des Moines FSDO
FAA report
20200121000069A
Case key
100848

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The student pilot's failure to maintain helicopter control while maneuvering to land, which resulted in impact with an airplane and a hangar.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parametersAircraft › Aircraft oper/perf/capability · Not attained/maintainedHelicopteres Guimbal CABRI G2: 2 casesAll aircraft: 1,269 casesProbable cause
Object/animal/substance: airport structureEnvironmental issues › Physical environment · Effect on operationHelicopteres Guimbal CABRI G2: 1 caseAll aircraft: 50 casesProbable cause
Object/animal/substance: aircraftEnvironmental issues › Physical environment · Effect on operationHelicopteres Guimbal CABRI G2: 1 caseAll aircraft: 116 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · Student/instructed pilotHelicopteres Guimbal CABRI G2: 11 casesAll aircraft: 9,295 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The solo student pilot reported that he "lost control" of the helicopter as he maneuvered over the ramp for a landing toward the south into wind. The student was unable to regain control of the helicopter, and it subsequently impacted an unoccupied airplane and a hangar. Airport security video footage showed the helicopter approaching the ramp in a hover-taxi heading east before it entered an increasingly rapid left spin as it drifted north toward the airplane and hangar. A review of the video of the accident did not reveal any evidence of a bird strike or visible hydraulic systems failure. The helicopter cabin and tailboom sustained substantial damage. The student reported that there were no mechanical malfunctions or failures with the helicopter that would have precluded normal operation. The student stated that the wind direction might have changed during the landing; however, a postaccident review of available weather data revealed that the wind was likely from the south about 12 to 13 knots.

Factual narrative

The student pilot, who was flying solo, reported that he "lost control" of the helicopter as he maneuvered over the ramp for a landing toward south and into the wind. The pilot was unable to regain directional control before the helicopter impacted an unoccupied airplane and a hangar. Airport security video footage showed the helicopter had approached the ramp in a hover-taxi heading east before it entered an increasingly rapid left spin as it drifted north toward a parked airplane and a hangar. The helicopter cabin and tail boom sustained substantial damage. The pilot reported that there were no mechanical malfunctions that would have precluded normal operation of the helicopter. The pilot stated that the wind direction might have changed during the landing; however, a postaccident review of available weather data confirmed that the wind was likely from the south at 12-13 knots.

Aircraft

Registration
N715RK
Reported as
Guimbal Cabri G2
Category
Helicopter
Serial number
1255
Built
2019
Airframe hours
154.5
Engine
Lycoming O-360-J2A, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
University of Dubuque
Registered owner
H&H Helicopter, LLC
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · December 12, 2019
Departed
MXO · Monticello, IA
Destination
IIB · Independence, IA
Flight plan
VFR
Airport
IIB · Independence Municipal Airport
Equipment
Electronic primary flight display, ADS-B

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
22
Injuries
Serious
Certificate
Student
Medical
Class 3, Without waivers/limitations
Seat
Right
Restraint
4-point
Flight hours
65 total · 65 in this make and model · 3 as pilot in command · 33 in the last 90 days · 23 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
170° at 12 knots
Visibility
7 statute miles
Lowest ceiling
None
Temperature
16 °F, dew point 12 °F
Altimeter
30.34 inHg
Observed at
IIB

Docket · 10

The files NTSB released with the investigation on July 17, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 11.1 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.