- 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.
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.