CEN17LA113

NTSB accident investigation · Bell-Transworld Helicopters 47D1 · Archer City, TX · February 9, 2017

Accident · Serious injuriesLimited investigationFinal report
Date
February 9, 2017, 14:30 local (20:30 UTC)
Place
Archer City, TX
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N2875FBell-Transworld Helicopters 47D1
Defining event
Enroute-cruise: Fuel starvation
Weather
Visual (VMC) · Day
Status
Completed · report June 14, 2017
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA Lubbock FSDO
FAA report
20170209001379A
Case key
94784

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 total loss of engine power due to fuel starvation, which resulted from the pilot’s inadvertent positioning of the mixture control to the “fuel cutoff” position.

Findings · 6

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.

Fuel system: fuel selector/shutoff valveAircraft › Aircraft systems · Unintentional use/operationBell-Transworld Helicopters 47D1: 1 caseAll aircraft: 176 casesProbable cause
Fluids: fuelAircraft › Fluids/misc hardware · Incorrect use/operationBell-Transworld Helicopters 47D1: 1 caseAll aircraft: 1,695 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 private pilot reported that he departed from his ranch and was flying about 100 ft above ground level and at 50 knots. He intended to position the carburetor heat to "on," but he inadvertently positioned the mixture control to the "fuel cutoff" position instead, and the engine lost total power. He immediately entered an autorotation, but because the helicopter was so low and slow, there was insufficient time and altitude to flare the helicopter. He stated that the airspeed decreased and that the main rotor blade stalled, which caused the helicopter to just "drop." The pilot reported no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation. The pilot's inadvertent positioning of the mixture control to the "fuel cutoff" position resulted in fuel starvation and the total loss of engine power.

Factual narrative

On February 9, 2017, about 1430 central standard time, a Bell – Transworld Helicopter 47D1, N2875F, sustained substantial damage during a forced landing to a field near Archer City, Texas. The pilot received serious injuries. The helicopter was owned and operated by the pilot under the provisions of the 14 Code of Federal Regulations Part 91 as a personal flight. Day visual meteorological conditions prevailed at the time of the accident and no flight plan was filed. The flight departed from the pilot's ranch near Holliday, Texas, about 1420. The pilot reported that he departed his ranch and was flying about 100 ft above ground level and at 50 knots airspeed to inspect a cattle herd near Archer, TX. He reported that he intended to check his carburetor heat to ON, but he unintendedly pulled the mixture control to the fuel cutoff position, and the engine had an immediate total loss of power. The pilot stated that he immediately entered an autorotation, but because he was so low and slow, there was not enough time and altitude to flare the helicopter. He stated that the airspeed decreased immediately and the main rotor blade stalled, causing the helicopter to just "drop." He stated that it only took seconds for the helicopter to impact the terrain. The pilot reported no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.

Aircraft

Registration
N2875F
Reported as
Bell-Transworld Helicopters 47D1
Category
Helicopter
Serial number
TWH-8
Built
1976
Airframe hours
2,530.1
Engine
Franklin 6V535A, 210 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 2, 2015
Departed
Holliday, TX
Destination
Holliday, TX
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
Pilot
Age
62
Injuries
Serious
Certificate
Private
Medical
Class 3, Unknown
Last flight review
July 30, 2014
Seat
Right
Restraint
Lap only
Flight hours
862 total · 213 in this make and model · 757 as pilot in command · 16 in the last 90 days · 11 in the last 30 days · 0.4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
140° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
52 °F, dew point 25 °F
Altimeter
30.29 inHg
Observed at
SPS, 24 nm away

Docket · 4

The files NTSB released with the investigation on April 20, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.7 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.