GAA15CA202

NTSB accident investigation · Bell 47G · De Queen, AR · July 25, 2015

Accident · Minor injuriesData collectionFinal report
Date
July 25, 2015, 07:35 local (12:35 UTC)
Place
De Queen, AR
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N1420WBell 47G
Defining event
Takeoff: Collision during takeoff/land
Weather
Visual (VMC) · Day
Status
Completed · report December 3, 2015
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
Federal Aviation Administration
FAA report
20150725014259A
Case key
91648

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

On this page

Probable cause

The pilot's failure to conduct helicopter performance planning, which resulted in an uncontrolled descent and impact with a truck and terrain during takeoff from an elevated platform.

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.

Planning/preparation: performance calculationsPersonnel issues › Task performance · PilotBell 47G-4A: 1 caseAll aircraft: 114 casesProbable cause
Performance/control parameters: climb rateAircraft › Aircraft oper/perf/capability · Not attained/maintainedBell 47G-4A: 1 caseAll aircraft: 265 casesProbable cause
Oversight: oversight of personnelOrganizational issues › Support/oversight/monitoring · OperatorBell 47G-4A: 1 caseAll aircraft: 26 cases
Temp/humidity/pressure: high density altitudeEnvironmental issues › Conditions/weather/phenomena · Effect on operationBell 47G-4A: 1 caseAll aircraft: 278 cases

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

According to the pilot of the skid-equipped helicopter, he had loaded the helicopter with the liquid to be used during the agricultural aerial application flight. The pilot and operator both stated during interviews, that performance planning calculations were not performed prior to the flight, regarding adjustments pertaining to weight and balance, density altitude, out of ground effect capability or in ground effect capability. According to the operator, an FAA approved weight and balance form was not provided to the pilot until after the accident. The pilot stated that during the takeoff from the elevated platform, he increased collective, established a 2 inch hover, applied forward cyclic, and the helicopter, "about a foot or two from the platform, shook violently and started to descend." The pilot recounted that he turned the nose of the helicopter approximately 45 degrees to the left and the main rotor blades impacted the tank truck upon which the elevated platform was mounted. When asked, the pilot stated that, "the temperature was hot, possibly in the lower 80 degrees Fahrenheit, and no wind." The nearest weather station was 7 miles east of the accident site and reported 100 percent humidity, a temperature of 73.4 degrees Fahrenheit, a dew point of 73.4 degrees Fahrenheit, no wind and a density altitude of 1,698.7 feet, at an airport elevation of 355 feet. The accident site elevation was 457 feet. The helicopter sustained substantial damage to the fuselage and main rotor system. The pilot reported that there were no mechanical malfunctions or failures with the helicopter prior to the flight that would have precluded normal operation.

Factual narrative

According to the pilot of the skid-equipped helicopter, he had loaded the helicopter with the liquid to be used during the agricultural aerial application flight. The pilot and operator both stated during interviews, that performance planning calculations were not performed prior to the flight, regarding adjustments pertaining to weight and balance, density altitude, out of ground effect capability or in ground effect capability. According to the operator, an FAA approved weight and balance form was not provided to the pilot until after the accident. The pilot stated that during the takeoff from the elevated platform, he increased collective, established a 2 inch hover, applied forward cyclic, and the helicopter, "about a foot or two from the platform, shook violently and started to descend." The pilot recounted that he turned the nose of the helicopter approximately 45 degrees to the left and the main rotor blades impacted the tank truck upon which the elevated platform was mounted. When asked, the pilot stated that, "the temperature was hot, possibly in the lower 80 degrees Fahrenheit, and no wind." The nearest weather station was 7 miles east of the accident site and reported 100 percent humidity, a temperature of 73.4 degrees Fahrenheit, a dew point of 73.4 degrees Fahrenheit, no wind and a density altitude of 1,698.7 feet, at an airport elevation of 355 feet. The accident site elevation was 457 feet. The helicopter sustained substantial damage to the fuselage and main rotor system. The pilot reported that there were no mechanical malfunctions or failures with the helicopter prior to the flight that would have precluded normal operation.

Aircraft

Registration
N1420W
Reported as
Bell 47G (4A)
Category
Helicopter
Serial number
7663
Built
1969
Airframe hours
8,014.3
Engine
Rolls Royce T63-A-720 C20, 420 horsepower, turbo shaft
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Hammock Flying Service Inc
Registered owner
Hammock Flying Service Inc
Airworthiness certificate
Special, Restricted (Special); Standard, Normal
Last inspection
100 hour · July 9, 2015 · 51 hours before
Departed
DEQ · De Queen, AR
Destination
DEQ · De Queen, AR
Equipment
Satellite tracking device, Onboard weather, Handheld GPS

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
52
Injuries
Minor
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, With waivers/limitations
Last flight review
March 12, 2014
Seat
Left
Restraint
4-point
Flight hours
5,434 total · 625 in this make and model · 5,354 as pilot in command · 155 in the last 90 days · 76 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
4 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 73 °F
Altimeter
29.96 inHg
Observed at
DEQ, 15 nm away

Docket · 4

The files NTSB released with the investigation on November 17, 2015, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.5 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.

Other investigations on N1420W · 1

Matched to the same aircraft by N-number and date.