GAA16CA075

NTSB accident investigation · Robinson Helicopter R44 · West Palm Beach, FL · December 9, 2015

Accident · No injuriesData collectionFinal report
Date
December 9, 2015, 08:40 local (13:40 UTC)
Place
West Palm Beach, FL
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N4427HRobinson Helicopter R44
Defining event
Landing: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report March 14, 2016
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA South Florida FSDO
FAA report
20151209020469I
Case key
92426

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 directional control during the landing, which resulted in a horizontal rotation of the helicopter, and abnormal runway contact.

Findings · 3

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · Student/instructed pilotRobinson Helicopter R44: 40 casesAll aircraft: 9,295 casesProbable cause
Rotorcraft flight control: tail rotor control systemAircraft › Aircraft propeller/rotor · Incorrect use/operationRobinson Helicopter R44: 1 caseAll aircraft: 13 casesProbable cause
Performance/control parameters: yaw controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedRobinson Helicopter R44: 6 casesAll aircraft: 149 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 helicopter pilot reported that he conducted eight traffic pattern flights to a full stop on the runway. On his ninth approach, he was at the bottom of the landing transitioning to a hover, and he increased power while simultaneously applying left pedal. He reported that as he entered the hover his airspeed was "close to 5 knots or less" and his altitude was "approximately 5 to 10 feet above ground level," the helicopter began to rapidly yaw to the right, he applied full left pedal, and the helicopter rotated "approximately 450 to 460 degrees." The student pilot reported that the helicopter began to "wobble," he lowered the collective to land, the helicopter bounced once, and then skidded to a stop. A postflight inspection revealed substantial damage to the fuselage and tail boom. The student pilot reported there were no pre-impact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. The student pilot reported that the wind was 060 degrees at 3 knots at the accident airport, approximately one hour prior to the accident time. The closest weather reporting station to the accident airport is 12 nautical miles away, and reported that the wind was calm approximately 13 minutes after the accident time.

Factual narrative

The solo student helicopter pilot reported that he conducted eight traffic pattern flights to a full stop on the runway. On his ninth approach, he was at the bottom of the landing transitioning to a hover, and he increased power while simultaneously applying left pedal. He reported that as he entered the hover his airspeed was "close to 5 knots or less" and his altitude was "approximately 5 to 10 feet above ground level," the helicopter began to rapidly yaw to the right, he applied full left pedal, and the helicopter rotated "approximately 450 to 460 degrees." The student pilot reported that the helicopter began to "wobble," he lowered the collective to land, the helicopter bounced once, and then skidded to a stop. A postflight inspection revealed substantial damage to the fuselage and tail boom. The student pilot reported there were no pre-impact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. The student pilot reported that the wind was 060 degrees at 3 knots at the accident airport, approximately one hour prior to the accident time. The closest weather reporting station to the accident airport is 12 nautical miles away, and reported that the wind was calm approximately 13 minutes after the accident time.

Aircraft

Registration
N4427H
Reported as
Robinson Helicopter R44 (UNDESIGNAT)
Category
Helicopter
Serial number
0923
Built
2000
Airframe hours
1,587.6
Engine
Lycoming O-540F1, 225 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · September 19, 2015
Departed
F45 · West Palm Beach, FL
Destination
F45 · West Palm Beach, FL
Airport
F45 · North Palm Beach County Genera, runway 08L, 3,679 × 75 ft, grass/turf
Equipment
None

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
Student pilot
Age
48
Injuries
None
Certificates
Student, Private
Airplane ratings
Single-engine land
Medical
Class 2, With waivers/limitations
Seat
Front
Restraint
3-point
Flight hours
126 total · 27 in this make and model · 22 as pilot in command · 56 in the last 90 days · 23 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Temperature
75 °F, dew point 70 °F
Altimeter
30.02 inHg
Observed at
KPBI, 12 nm away

Docket · 3

The files NTSB released with the investigation on March 8, 2016, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.2 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.